Natan Augusto Vieira Bulgarelli, J. L. Biazussi, W. M. Verde, A. Bannwart, M. Castro
– Emulsion flows have been a severe flow assurance issue, mainly in mature oil fields. Its formation occurs due to shear on oil-water flows caused by artificial lift methods, such as Electrical Submersible Pumps (ESP), and/or valves. The shear rate has an important role in emulsion flow behavior related to its relative viscosity and phase inversion. Therefore, this work presented an experimental investigation of the shear effect on three emulsion systems flowing in a pipeline. The shear element used was a combination of an 8-stage ESP and a glob valve. The emulsion systems analyzed were unstable emulsion and stable emulsion with and without a demulsifier. The experimental investigation was carried out for two ESP rotational speeds, 2400 and 3500 rpm, and one total volumetric flow rate, varying the water cut. From this study, it was observed that phase inversion occurred with increasing shear. Moreover, the effective viscosity was the same regardless of the surfactant presence for the three emulsion systems tested.
{"title":"Experimental Investigation of the Shear Effect on Oil-Water Emulsion Flow in a Pipeline","authors":"Natan Augusto Vieira Bulgarelli, J. L. Biazussi, W. M. Verde, A. Bannwart, M. Castro","doi":"10.11159/htff22.154","DOIUrl":"https://doi.org/10.11159/htff22.154","url":null,"abstract":"– Emulsion flows have been a severe flow assurance issue, mainly in mature oil fields. Its formation occurs due to shear on oil-water flows caused by artificial lift methods, such as Electrical Submersible Pumps (ESP), and/or valves. The shear rate has an important role in emulsion flow behavior related to its relative viscosity and phase inversion. Therefore, this work presented an experimental investigation of the shear effect on three emulsion systems flowing in a pipeline. The shear element used was a combination of an 8-stage ESP and a glob valve. The emulsion systems analyzed were unstable emulsion and stable emulsion with and without a demulsifier. The experimental investigation was carried out for two ESP rotational speeds, 2400 and 3500 rpm, and one total volumetric flow rate, varying the water cut. From this study, it was observed that phase inversion occurred with increasing shear. Moreover, the effective viscosity was the same regardless of the surfactant presence for the three emulsion systems tested.","PeriodicalId":385356,"journal":{"name":"Proceedings of the 8th World Congress on Mechanical, Chemical, and Material Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124382668","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Tajul Ariffin Norizan, Rosazlan Abu Seman, Hapida Ghazali
Extended Abstract Solar or photovoltaic power has been a source of energy for many years and the number of installations of large-scale solar panel or commonly known as the solar farm worldwide is increasing significantly. It is an indication of global initiative towards replacing the mainstream energy source namely the fossil fuel which is predicted to deplete in 2030. Among the challenges of establishing photovoltaic as a power source is space availability as solar farm can be land-intensive and vacant lands are very limited. The solution to this problem is by installing photovoltaic panels over water by means of buoyancy and this has given the name widely referred to as floating solar panels or floating photovoltaic (FPV). FPV is most often deployed on massive water bodies such as dams and reservoir but one of the strategic locations for the installation of FPV worth considering is the off-river storage facilities. The establishment of off-river storage facility in Malaysia is becoming a priority to the nation as the country has been facing water shortage issue for the past decades despite receiving an average of 2000 mm to 2500 mm of rainfall annually. The project, which is called Takungan Air Pinggiran Sungai (TAPS), or riverside water storage, has entered the implementation phase where the government has invested in its construction in Malaysia especially the areas with high population [1]-[2]. The main concept of TAPS is to divert excessive stormwater from the river during heavy rain and store the water as reserve to support the main water supply for consumers.
太阳能或光伏发电多年来一直是一种能源，世界范围内大型太阳能电池板或通常称为太阳能农场的安装数量正在显著增加。这是全球倡议取代主流能源的迹象，即预计将在2030年耗尽的化石燃料。建立光伏发电作为能源的挑战之一是空间的可用性，因为太阳能农场可能是土地密集型的，而空置的土地非常有限。解决这一问题的方法是利用浮力在水面上安装光伏板，这就给了人们广泛提到的浮动太阳能板或浮动光伏(FPV)的名字。FPV通常部署在大坝和水库等大型水体上，但值得考虑的安装FPV的战略位置之一是河外储存设施。尽管马来西亚年平均降雨量为2000毫米至2500毫米，但该国在过去几十年一直面临缺水问题，因此在马来西亚建立河外储存设施正成为该国的优先事项。该项目被称为Takungan Air Pinggiran Sungai (TAPS)，或河畔蓄水，已进入实施阶段，政府已在马来西亚投资建设，特别是在人口众多的地区。水龙头的主要概念是在大雨期间从河流中分流多余的雨水，并将水储存起来作为储备，以支持消费者的主要供水。
{"title":"Floating Photovoltaic Installation at Off River Storage Facilities to Optimize Infrastructure Utilization","authors":"Tajul Ariffin Norizan, Rosazlan Abu Seman, Hapida Ghazali","doi":"10.11159/icmie22.145","DOIUrl":"https://doi.org/10.11159/icmie22.145","url":null,"abstract":"Extended Abstract Solar or photovoltaic power has been a source of energy for many years and the number of installations of large-scale solar panel or commonly known as the solar farm worldwide is increasing significantly. It is an indication of global initiative towards replacing the mainstream energy source namely the fossil fuel which is predicted to deplete in 2030. Among the challenges of establishing photovoltaic as a power source is space availability as solar farm can be land-intensive and vacant lands are very limited. The solution to this problem is by installing photovoltaic panels over water by means of buoyancy and this has given the name widely referred to as floating solar panels or floating photovoltaic (FPV). FPV is most often deployed on massive water bodies such as dams and reservoir but one of the strategic locations for the installation of FPV worth considering is the off-river storage facilities. The establishment of off-river storage facility in Malaysia is becoming a priority to the nation as the country has been facing water shortage issue for the past decades despite receiving an average of 2000 mm to 2500 mm of rainfall annually. The project, which is called Takungan Air Pinggiran Sungai (TAPS), or riverside water storage, has entered the implementation phase where the government has invested in its construction in Malaysia especially the areas with high population [1]-[2]. The main concept of TAPS is to divert excessive stormwater from the river during heavy rain and store the water as reserve to support the main water supply for consumers.","PeriodicalId":385356,"journal":{"name":"Proceedings of the 8th World Congress on Mechanical, Chemical, and Material Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116847220","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
- Residual oil saturation (S or ) after waterflooding is high in carbonate reservoirs, due to the wettability state, making them a lucrative candidate for novel enhanced oil recovery (EOR) methods such as engineered water/polymer flooding (EWPF). Initial wettability for such reservoirs must be considered during the preliminary screening for an effective EWPF application. This experimental study investigates the carbonate initial wettability criteria to achieve a successful EWPF design. Contact angles are measured at 80 o C to evaluate the temperature effect on wettability shift by engineered water (EW). Coreflood tests are conducted under different initial wettability conditions to analyse EWPF performance in weak, moderate, and strong oil-wet mediums. Capillary numbers and a corresponding reduction in S or are estimated to develop a screening parameter. EW prepared by 10 times diluted Caspian seawater spiked with optimized active ions has caused a 40-55 o reduction in contact angle, making the rock more water-wet. S or after waterflooding is 25% higher in a strong oil-wet carbonate sample in contrast with a weak oil-wet condition, implying such reservoirs are appropriate candidates for EWPF application. Ion-tuned water flooding has provided 8% of OOIC incremental recovery in strong oil-wet medium while it has given a negligible recovery in the weak oil-wet case. Despite having similar capillary numbers, EWPF has resulted in a 16% more reduction in S or in the strong oil-wet system compared to the weak oil-wet system. This study presented a preliminary screening criterion for EW-based hybrid methods by considering the initial wettability of a reservoir. The results show that the hybrid EWPF method can reduce Sor more than that predicted by capillary desaturation curves. Hence, it has a higher capillary desaturation tendency and can be successfully applied to carbonate formations that are not water wet.
{"title":"Effect of Initial Wettability on Capillary Desaturation by Hybrid Engineered Water/Polymer Flooding in Carbonate Reservoirs","authors":"M. Shakeel, P. Pourafshary, M. Hashmet","doi":"10.11159/iccpe22.125","DOIUrl":"https://doi.org/10.11159/iccpe22.125","url":null,"abstract":"- Residual oil saturation (S or ) after waterflooding is high in carbonate reservoirs, due to the wettability state, making them a lucrative candidate for novel enhanced oil recovery (EOR) methods such as engineered water/polymer flooding (EWPF). Initial wettability for such reservoirs must be considered during the preliminary screening for an effective EWPF application. This experimental study investigates the carbonate initial wettability criteria to achieve a successful EWPF design. Contact angles are measured at 80 o C to evaluate the temperature effect on wettability shift by engineered water (EW). Coreflood tests are conducted under different initial wettability conditions to analyse EWPF performance in weak, moderate, and strong oil-wet mediums. Capillary numbers and a corresponding reduction in S or are estimated to develop a screening parameter. EW prepared by 10 times diluted Caspian seawater spiked with optimized active ions has caused a 40-55 o reduction in contact angle, making the rock more water-wet. S or after waterflooding is 25% higher in a strong oil-wet carbonate sample in contrast with a weak oil-wet condition, implying such reservoirs are appropriate candidates for EWPF application. Ion-tuned water flooding has provided 8% of OOIC incremental recovery in strong oil-wet medium while it has given a negligible recovery in the weak oil-wet case. Despite having similar capillary numbers, EWPF has resulted in a 16% more reduction in S or in the strong oil-wet system compared to the weak oil-wet system. This study presented a preliminary screening criterion for EW-based hybrid methods by considering the initial wettability of a reservoir. The results show that the hybrid EWPF method can reduce Sor more than that predicted by capillary desaturation curves. Hence, it has a higher capillary desaturation tendency and can be successfully applied to carbonate formations that are not water wet.","PeriodicalId":385356,"journal":{"name":"Proceedings of the 8th World Congress on Mechanical, Chemical, and Material Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115045426","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
- HFOs refrigerant R1234ze(E) has been widely applied in supercritical heat pump system and supercritical Organic Rankine Cycle (ORC) in recent years due to zero ODP and extremely low GWP. In this paper, experimental research on the cooling heat transfer performances of supercritical HFO-1234ze(E) in horizontal helically coiled tube (HCT) is performed. The impacts of mass flux ( G ) and pressure ( P ) on the heat transfer coefficient ( h ), the relative proportion of gravitational buoyancy effect and centrifugal buoyancy effect ( g c Ri / Ri ), the heat transfer enhancement of HCT and the distribution of secondary flow velocity ( V s ) are detailed analyzed. The increasing P suppresses the impact of G on h , while the increasing G strengthens the influence of P on h . g c Ri / Ri decreases with the enhancement of G , yet increases with the rising P . The higher the mass flux is, the more obvious the influence of centrifugal force on the cross-sectional distribution of V s will be, and the more significant the heat transfer enhancement of HCT will become. When G is 240 and 400 kg/m 2 s respectively, h of s-R1234ze(E) in helical tube is 12.73% and 18.69% higher than that in straight tube. The variation of P hardly changes the centrifugal effect on the distribution of V s , thus having little impact on the heat transfer enhancement of HCT. When P is 4.5 and 5 MPa respectively, h of helical tube is 15.38% and 15.12% higher than that of straight tube. In the region of T b > T pc , the correlation of straight tube has large prediction deviations for the performances of s-R1234ze(E) in helical tube owing to the absence of Ri c term.
- HFOs制冷剂R1234ze(E)由于ODP为零，GWP极低，近年来在超临界热泵系统和超临界有机朗肯循环(ORC)中得到了广泛应用。本文对超临界HFO-1234ze(E)在水平螺旋盘管(HCT)中的冷却换热性能进行了实验研究。详细分析了质量通量(G)和压力(P)对换热系数(h)、重力浮力效应和离心浮力效应的相对比例(G c Ri / Ri)、HCT的换热增强和二次流速度(V s)分布的影响。P的增加抑制了G对h的影响，而G的增加则增强了P对h的影响。Ri / Ri随g的增大而减小，随P的增大而增大。质量通量越大，离心力对V s截面分布的影响越明显，HCT的换热强化效果越显著。当G分别为240和400 kg/m 2s时，螺旋管中s- r1234ze (E)的h比直管高12.73%和18.69%。P的变化几乎没有改变离心作用对V s分布的影响，因此对HCT的强化传热影响不大。当P分别为4.5 MPa和5 MPa时，螺旋管的h比直管高15.38%和15.12%。在T b > T pc区域，由于没有Ri c项，直线管的相关系数对螺旋管s-R1234ze(E)性能的预测偏差较大。
{"title":"Experimental Investigation On Heat Transfer Enhancement And New Correlation Of Supercritical R1234ze(E) In Horizontal Helically Coiled Tube","authors":"Yizhou Jiang, Peng Hu, Qi Chen, Cheng Jia, Pan-Pan Zhao, Lei Jia","doi":"10.11159/icmie22.114","DOIUrl":"https://doi.org/10.11159/icmie22.114","url":null,"abstract":"- HFOs refrigerant R1234ze(E) has been widely applied in supercritical heat pump system and supercritical Organic Rankine Cycle (ORC) in recent years due to zero ODP and extremely low GWP. In this paper, experimental research on the cooling heat transfer performances of supercritical HFO-1234ze(E) in horizontal helically coiled tube (HCT) is performed. The impacts of mass flux ( G ) and pressure ( P ) on the heat transfer coefficient ( h ), the relative proportion of gravitational buoyancy effect and centrifugal buoyancy effect ( g c Ri / Ri ), the heat transfer enhancement of HCT and the distribution of secondary flow velocity ( V s ) are detailed analyzed. The increasing P suppresses the impact of G on h , while the increasing G strengthens the influence of P on h . g c Ri / Ri decreases with the enhancement of G , yet increases with the rising P . The higher the mass flux is, the more obvious the influence of centrifugal force on the cross-sectional distribution of V s will be, and the more significant the heat transfer enhancement of HCT will become. When G is 240 and 400 kg/m 2 s respectively, h of s-R1234ze(E) in helical tube is 12.73% and 18.69% higher than that in straight tube. The variation of P hardly changes the centrifugal effect on the distribution of V s , thus having little impact on the heat transfer enhancement of HCT. When P is 4.5 and 5 MPa respectively, h of helical tube is 15.38% and 15.12% higher than that of straight tube. In the region of T b > T pc , the correlation of straight tube has large prediction deviations for the performances of s-R1234ze(E) in helical tube owing to the absence of Ri c term.","PeriodicalId":385356,"journal":{"name":"Proceedings of the 8th World Congress on Mechanical, Chemical, and Material Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128686387","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
N. Burabayeva, V. N. Volodin, S. Trebukhov, A. Nitsenko, K. A. Linnik
- Based on the values of aluminum telluride vapor pressure determined by the boiling point method and aluminum found by integration, the partial and integral thermodynamic functions of formation and evaporation of the aluminum-telluride system melts have been calculated. The vapor pressure of aluminum telluride ( ) above the melting point has been determined for the first time. Integral functions of alloys mixing have a maximum (entropy - 5.23±0.31 J/(mol-K), enthalpy -4.17±0.24 kJ/mol) at monotectic corresponding to 42 - 44 at. % Te in the melt. The formation of alloys is accompanied by an increase in disorder in the system and goes with heat absorption. Integral functions of evaporation monotonically decrease from aluminum to telluride, and the entropy of evaporation Al 2 Te 3 (60.71±3.37 J/(mol×K)) indirectly confirms the congruent nature of aluminum telluride evaporation. The state diagram is supplemented with the fields of melt and vapor co-consistency at atmospheric pressure and in a vacuum of 6.67 kPa, which testify to the possibility of distillation separation of the Al - Al 2 Te 3 system.
{"title":"Thermodynamics of Formation and Evaporation of Aluminum and\u0000Aluminum Telluride Melts","authors":"N. Burabayeva, V. N. Volodin, S. Trebukhov, A. Nitsenko, K. A. Linnik","doi":"10.11159/mmme22.129","DOIUrl":"https://doi.org/10.11159/mmme22.129","url":null,"abstract":"- Based on the values of aluminum telluride vapor pressure determined by the boiling point method and aluminum found by integration, the partial and integral thermodynamic functions of formation and evaporation of the aluminum-telluride system melts have been calculated. The vapor pressure of aluminum telluride ( ) above the melting point has been determined for the first time. Integral functions of alloys mixing have a maximum (entropy - 5.23±0.31 J/(mol-K), enthalpy -4.17±0.24 kJ/mol) at monotectic corresponding to 42 - 44 at. % Te in the melt. The formation of alloys is accompanied by an increase in disorder in the system and goes with heat absorption. Integral functions of evaporation monotonically decrease from aluminum to telluride, and the entropy of evaporation Al 2 Te 3 (60.71±3.37 J/(mol×K)) indirectly confirms the congruent nature of aluminum telluride evaporation. The state diagram is supplemented with the fields of melt and vapor co-consistency at atmospheric pressure and in a vacuum of 6.67 kPa, which testify to the possibility of distillation separation of the Al - Al 2 Te 3 system.","PeriodicalId":385356,"journal":{"name":"Proceedings of the 8th World Congress on Mechanical, Chemical, and Material Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126817786","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Extended Abstract Adsorbents are the main design factor in the desiccant rotor of a solid dehumidification system because they are directly related to the dehumidification and energy performance [1,2]. Silica gel and zeolite have been widely used in conventional desiccant rotors owing to their wide range of temperature and humidity conditions. However, they have a limitation to dramatically enhance the dehumidification and energy performance of a desiccant rotor owing to its high regeneration temperature and low water adsorption capacity [3]. In this regard, MIL-100 (Fe) has attracted attention to overcome this challenge because it has a low regeneration temperature and high-water adsorption capacity [4,5]. However, studies on the desiccant rotor coated with MIL-100 (Fe) have been very limited. Therefore, the moisture removal capacity (MRC) and dehumidification coefficient of performance (DCOP) of a desiccant rotor coated with MIL-100 (Fe) must be investigated to figure out the dehumidification and energy performance. In this study, the MRC and DCOP of the desiccant rotor coated with MIL-100 (Fe) were investigated through experiments under various process air conditions. The experimental setup was constructed in the environmental chamber based on the NREL desiccant wheel test guide [6] and ASHRAE standard 174 [7]. The desiccant
{"title":"Dehumidification Performance Evaluation of a Desiccant Rotor Coated With MIL100 (Fe) Under Process Air Conditions","authors":"J. Y. Chung, M. Park, Sewon Lee, Yongchan Kim","doi":"10.11159/htff22.146","DOIUrl":"https://doi.org/10.11159/htff22.146","url":null,"abstract":"Extended Abstract Adsorbents are the main design factor in the desiccant rotor of a solid dehumidification system because they are directly related to the dehumidification and energy performance [1,2]. Silica gel and zeolite have been widely used in conventional desiccant rotors owing to their wide range of temperature and humidity conditions. However, they have a limitation to dramatically enhance the dehumidification and energy performance of a desiccant rotor owing to its high regeneration temperature and low water adsorption capacity [3]. In this regard, MIL-100 (Fe) has attracted attention to overcome this challenge because it has a low regeneration temperature and high-water adsorption capacity [4,5]. However, studies on the desiccant rotor coated with MIL-100 (Fe) have been very limited. Therefore, the moisture removal capacity (MRC) and dehumidification coefficient of performance (DCOP) of a desiccant rotor coated with MIL-100 (Fe) must be investigated to figure out the dehumidification and energy performance. In this study, the MRC and DCOP of the desiccant rotor coated with MIL-100 (Fe) were investigated through experiments under various process air conditions. The experimental setup was constructed in the environmental chamber based on the NREL desiccant wheel test guide [6] and ASHRAE standard 174 [7]. The desiccant","PeriodicalId":385356,"journal":{"name":"Proceedings of the 8th World Congress on Mechanical, Chemical, and Material Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122214627","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Extended Abstract In this work we study numerically the development of traditional and reversed funnel-shaped vortices in a rotating cylinder in the presence of horizontal thermal gradients at both, bottom and top, which are heated and cooled respectively. Field observations show the formation of traditional funnel-shaped and reversed funnel-shaped vortices in tornadogenesis. It is questionless the relevance of horizontal and vertical thermal gradients on the formation and evolution of those and other atmospheric vortices. Studies show the development of bottom-up vortices when exists a horizontal temperature gradient at the bottom [1,2], and the situation of a cold pool aloft is found in the context of cold air funnels and tornadoes [3]. in configurations localized
{"title":"Traditional or Reversed Funnel Shape in a Tornado-Like Vortex","authors":"D. Castaño, M. C. Navarro, Henar Herrero","doi":"10.11159/htff22.134","DOIUrl":"https://doi.org/10.11159/htff22.134","url":null,"abstract":"Extended Abstract In this work we study numerically the development of traditional and reversed funnel-shaped vortices in a rotating cylinder in the presence of horizontal thermal gradients at both, bottom and top, which are heated and cooled respectively. Field observations show the formation of traditional funnel-shaped and reversed funnel-shaped vortices in tornadogenesis. It is questionless the relevance of horizontal and vertical thermal gradients on the formation and evolution of those and other atmospheric vortices. Studies show the development of bottom-up vortices when exists a horizontal temperature gradient at the bottom [1,2], and the situation of a cold pool aloft is found in the context of cold air funnels and tornadoes [3]. in configurations localized","PeriodicalId":385356,"journal":{"name":"Proceedings of the 8th World Congress on Mechanical, Chemical, and Material Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134093731","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
I. Marinić-Kragić, D. Vucina, I. Pehnec, Petar Latinac
Extended Abstract Classical Savonius - type wind turbines (SWT) with semi - circular blades were shown to achieve peak power coefficient (efficiency or c P ) up to 25% [1] . The peak power coefficient values were achieved only at relatively high Reynolds number (Re>800k). This was initially shown only using wind-tunnel investigations, and these results were strengthened by many subsequent numerical studies which have shown good correlation with the experimental data. In recent SWT research, the objective is mostly related to increasing relatively low SWT efficiency. One of the notable SWT blade shape modifica tions to show significant improvement was proposed by Bach and Benes in [2] –[4] . The modified blade shape was composed a straight part in the inner rotor part and a circular - arc (spanning less than 180°) on the outer part. The peak power coefficient was increased from 22% to 28%. D ifferent recent studies attempted further improvement using complex curves such as elliptical [5], spline [6] or multiple smaller quarter [7] , with no major improvement. A major improvement was achieved in numerical shape - optimization studie s with the novel "scooplet - based" SWT [8] with efficiency increased to 37% using 2D CFD and 34% using 3D CFD [9] .
{"title":"Numerical and Experimental Evaluation of High-Efficiency Savonius Type Wind Turbine at Low Reynolds Number","authors":"I. Marinić-Kragić, D. Vucina, I. Pehnec, Petar Latinac","doi":"10.11159/htff22.159","DOIUrl":"https://doi.org/10.11159/htff22.159","url":null,"abstract":"Extended Abstract Classical Savonius - type wind turbines (SWT) with semi - circular blades were shown to achieve peak power coefficient (efficiency or c P ) up to 25% [1] . The peak power coefficient values were achieved only at relatively high Reynolds number (Re>800k). This was initially shown only using wind-tunnel investigations, and these results were strengthened by many subsequent numerical studies which have shown good correlation with the experimental data. In recent SWT research, the objective is mostly related to increasing relatively low SWT efficiency. One of the notable SWT blade shape modifica tions to show significant improvement was proposed by Bach and Benes in [2] –[4] . The modified blade shape was composed a straight part in the inner rotor part and a circular - arc (spanning less than 180°) on the outer part. The peak power coefficient was increased from 22% to 28%. D ifferent recent studies attempted further improvement using complex curves such as elliptical [5], spline [6] or multiple smaller quarter [7] , with no major improvement. A major improvement was achieved in numerical shape - optimization studie s with the novel \"scooplet - based\" SWT [8] with efficiency increased to 37% using 2D CFD and 34% using 3D CFD [9] .","PeriodicalId":385356,"journal":{"name":"Proceedings of the 8th World Congress on Mechanical, Chemical, and Material Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134336940","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
- The experimental investigation and numerical analysis of horizontally placed flat pulsating heat pipe is carried out. The flat pulsating heat pipe with a width of 11 mm and thickness of 2mm is used for experimental investigation. Out of the total volume of the tube 72 % of the volume is filled with water as working fluid. The processor of a computer act as heat source. The flat pulsating heat pipe takes heat from the processor of and rejects heat at another end. The externally powered fan is used to increase the rate of heat transfer. During the operation the 8 watts of power is consumed by the processor. The maximum temperature recorded during the operation of processor of computer is 323 K. The temperatures are measured with the help of digital laser thermometer. The numerical model is developed with Ansys design modeler. The volume of fluid approach is used to predict the physics of fluid flow during complex phenomenon of evaporation and condensation.
{"title":"Experimental investigation and Numerical Analysis of Horizontally Placed Flat Pulsating Heat Pipe for Electronic Cooling","authors":"R. D. Bhagat, S. Deshmukh","doi":"10.11159/htff22.191","DOIUrl":"https://doi.org/10.11159/htff22.191","url":null,"abstract":"- The experimental investigation and numerical analysis of horizontally placed flat pulsating heat pipe is carried out. The flat pulsating heat pipe with a width of 11 mm and thickness of 2mm is used for experimental investigation. Out of the total volume of the tube 72 % of the volume is filled with water as working fluid. The processor of a computer act as heat source. The flat pulsating heat pipe takes heat from the processor of and rejects heat at another end. The externally powered fan is used to increase the rate of heat transfer. During the operation the 8 watts of power is consumed by the processor. The maximum temperature recorded during the operation of processor of computer is 323 K. The temperatures are measured with the help of digital laser thermometer. The numerical model is developed with Ansys design modeler. The volume of fluid approach is used to predict the physics of fluid flow during complex phenomenon of evaporation and condensation.","PeriodicalId":385356,"journal":{"name":"Proceedings of the 8th World Congress on Mechanical, Chemical, and Material Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115657879","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Yuki Kato, Guanming Guo, Masaya Kamigaki, Kenmei Fujimoto, Mikimasa Kawaguchi, K. Nishida, H. Hongou, Masanobu Koutoku, H. Yokohata, Shinji Sumi, Ryo Yamamoto, Y. Ogata
- The objective of this study is to investigate experimentally the effect of pulsation frequency on the heat transfer characteristics and the mechanism of the pulsation flow, which is representative of the operating conditions of the engine exhaust flow. The experimental apparatus consists of a rotating disk with holes that converts steady hot air flow rate into a pulsating flow to exchange heat energy with external air. The fluid temperature is measured by thermocouples, and the wall temperature is measured by thermography. It is found that heat transfer enhancement due to pulsation does not occur at frequencies below 25 Hz, even though the velocity amplitude is large. In order to investigate the cause of this phenomenon, the flow field is measured by PIV(Particle Image Velocimetry) and the turbulent kinetic energy is evaluated. It is clarified that the turbulent kinetic energy near the wall is small at frequencies below 30 Hz, despite the large velocity amplitude. From the time series of velocity data, it was observed that the turbulence is extremely small during the acceleration phase of the fluid. As a result, the turbulent mixing during the acceleration phase is suppressed, and the time-averaged turbulent kinetic energy becomes small, which is thought to have suppressed heat transfer enhancement. This is the first attempt to experimentally link heat transfer and flow structure fluctuations in a pulsating flow, which is achieved by unsteady measurement of the flow field using PIV and calculation of the turbulent kinetic energy.
{"title":"Correlation Between Wall Heat Transfer And Characteristics Of Pulsating Flow In A Rectangular Tube Toward An Automobile Exhaust System","authors":"Yuki Kato, Guanming Guo, Masaya Kamigaki, Kenmei Fujimoto, Mikimasa Kawaguchi, K. Nishida, H. Hongou, Masanobu Koutoku, H. Yokohata, Shinji Sumi, Ryo Yamamoto, Y. Ogata","doi":"10.11159/htff22.140","DOIUrl":"https://doi.org/10.11159/htff22.140","url":null,"abstract":"- The objective of this study is to investigate experimentally the effect of pulsation frequency on the heat transfer characteristics and the mechanism of the pulsation flow, which is representative of the operating conditions of the engine exhaust flow. The experimental apparatus consists of a rotating disk with holes that converts steady hot air flow rate into a pulsating flow to exchange heat energy with external air. The fluid temperature is measured by thermocouples, and the wall temperature is measured by thermography. It is found that heat transfer enhancement due to pulsation does not occur at frequencies below 25 Hz, even though the velocity amplitude is large. In order to investigate the cause of this phenomenon, the flow field is measured by PIV(Particle Image Velocimetry) and the turbulent kinetic energy is evaluated. It is clarified that the turbulent kinetic energy near the wall is small at frequencies below 30 Hz, despite the large velocity amplitude. From the time series of velocity data, it was observed that the turbulence is extremely small during the acceleration phase of the fluid. As a result, the turbulent mixing during the acceleration phase is suppressed, and the time-averaged turbulent kinetic energy becomes small, which is thought to have suppressed heat transfer enhancement. This is the first attempt to experimentally link heat transfer and flow structure fluctuations in a pulsating flow, which is achieved by unsteady measurement of the flow field using PIV and calculation of the turbulent kinetic energy.","PeriodicalId":385356,"journal":{"name":"Proceedings of the 8th World Congress on Mechanical, Chemical, and Material Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123943443","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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