- The purpose of this article is to present the results of a study on the water of the wastewater treatment plant in Durrës. For this, a study was conducted during the months of May, June and July 2021 which was based on the determination of the different forms of phosphorus in water, as one of the main nutrients, and responsible for the eutrophication of waters. Representative sampling was done before treatment, after treatment and in wetlands. Storage and transport of samples, based on recommended standard methods. Four different forms of phosphorus were identified (orthophosphate, total phosphorus, condensed phosphorus and organic phosphorus). The selection of standard analysis methods was made by APHA and DIN and for each of them the performance parameters of the method were defined (sensitivity, dictation limit and linear area of measurements). The results obtained were processed and compared with "On permissible discharge rates and zoning criteria for aquatic receiving environments", and EU Directive 91/271 / EEC. The results obtained from the study, showed the higher concentrations of different forms of phosphorus at the station before treatment, but only the values of total phosphorus concentration resulted outside the allowed norms. At the post-treatment station or in wetlands it is noticed that the concentrations of the studied of different forms of phosphorus are within the allowed norms, with the exception of the total phosphorus concentration. Therefore, for the reduction and recovery of phosphorus from water of wastewater treatment plants, the forms of phosphorus that are present must be considered.
{"title":"Determination of Different Forms of Phosphorus in Waters of the Wastewater Treatment Plant in Durres, Before and After Treatment","authors":"V. Hoxha, A. Jano, K. Vaso, Enkela Poro","doi":"10.11159/iccpe22.116","DOIUrl":"https://doi.org/10.11159/iccpe22.116","url":null,"abstract":"- The purpose of this article is to present the results of a study on the water of the wastewater treatment plant in Durrës. For this, a study was conducted during the months of May, June and July 2021 which was based on the determination of the different forms of phosphorus in water, as one of the main nutrients, and responsible for the eutrophication of waters. Representative sampling was done before treatment, after treatment and in wetlands. Storage and transport of samples, based on recommended standard methods. Four different forms of phosphorus were identified (orthophosphate, total phosphorus, condensed phosphorus and organic phosphorus). The selection of standard analysis methods was made by APHA and DIN and for each of them the performance parameters of the method were defined (sensitivity, dictation limit and linear area of measurements). The results obtained were processed and compared with \"On permissible discharge rates and zoning criteria for aquatic receiving environments\", and EU Directive 91/271 / EEC. The results obtained from the study, showed the higher concentrations of different forms of phosphorus at the station before treatment, but only the values of total phosphorus concentration resulted outside the allowed norms. At the post-treatment station or in wetlands it is noticed that the concentrations of the studied of different forms of phosphorus are within the allowed norms, with the exception of the total phosphorus concentration. Therefore, for the reduction and recovery of phosphorus from water of wastewater treatment plants, the forms of phosphorus that are present must be considered.","PeriodicalId":385356,"journal":{"name":"Proceedings of the 8th World Congress on Mechanical, Chemical, and Material Engineering","volume":"64 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115819307","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}
D. M. Iceri, J. L. Biazussi, C. Geest, R. Thompson, M. Castro
Materials with viscoplastic characteristics have being widely studied due to their applicability in industries, but also because of their common presence in nature. Fluids with such characteristic can be modelled by the equation known as Herschel-Bulkley. This type of fluid has a yield stress property, which is extremely important to characterize it. Carbopol solution is the most common fluid used for experimental studies involving this type of fluid. However, the Carbopol solution needs a neutralizing agent, which acts as a pH regulator, prevents the formation of fungus, but it also affects the yield stress. In the present work, measurements of the yield stress from flow curve tests, performed in a rheometer, were made for different combinations of Carbopol and Triethanolamine (neutralizing agent) concentrations. The yield stress increased with the increment in the concentration of both, Carbopol and Triethanolamine (TEA), in addition, it was observed that TEA concentrations must be greater than 500 ppm to avoid the formation of fungi and less than 700 ppm to obtain a homogeneous solution.
{"title":"Analysis of Carbopol And Triethanolamine Concentration in The Viscoplastic Properties of Aqueous Solution","authors":"D. M. Iceri, J. L. Biazussi, C. Geest, R. Thompson, M. Castro","doi":"10.11159/htff22.166","DOIUrl":"https://doi.org/10.11159/htff22.166","url":null,"abstract":"Materials with viscoplastic characteristics have being widely studied due to their applicability in industries, but also because of their common presence in nature. Fluids with such characteristic can be modelled by the equation known as Herschel-Bulkley. This type of fluid has a yield stress property, which is extremely important to characterize it. Carbopol solution is the most common fluid used for experimental studies involving this type of fluid. However, the Carbopol solution needs a neutralizing agent, which acts as a pH regulator, prevents the formation of fungus, but it also affects the yield stress. In the present work, measurements of the yield stress from flow curve tests, performed in a rheometer, were made for different combinations of Carbopol and Triethanolamine (neutralizing agent) concentrations. The yield stress increased with the increment in the concentration of both, Carbopol and Triethanolamine (TEA), in addition, it was observed that TEA concentrations must be greater than 500 ppm to avoid the formation of fungi and less than 700 ppm to obtain a homogeneous solution.","PeriodicalId":385356,"journal":{"name":"Proceedings of the 8th World Congress on Mechanical, Chemical, and Material Engineering","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125923540","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}
- Nanoparticles due to their unique characteristics are gaining attraction for enhanced oil recovery (EOR) applications. Nanoparticles during the EOR process may activate many mechanisms, particularly wettability alteration, and thus improve the recovery factor. Silica nanoparticle has been largely testified for EOR. The effect of alumina nanoparticles for EOR is also being investigated recently. Their combination may enhance their performance in wettability alteration. In this research, we studied the wettability alteration and recovery performance of the hybrid nanoparticles. A series of experiments were conducted starting from zeta potential and contact angle measurement to determine optimum concentrations of silica, alumina, and hybrid nanoparticles. After dispersing nanoparticles (alone and hybrid), solutions were homogenized using ultrasonic homogenizer. The zeta potential results showed that the silica nanofluid could stay stable for at least 3 days without the need for a stabilizer. However, a stabilizer (SDBS) is required to prepare stable alumina and hybrid nanofluid. Baseline experiments were conducted with the stabilizer to quantify the performance of the stabilizer. Later, contact angles were measured (at room temperature and 80 °C) to analyze the effect of the nanofluid on rock/oil/brine systems and to determine the optimal nanofluid concentration. The results of contact angle experiments prove that, for both temperatures (room and 80 °C), maximum alteration in wettability was shown by the hybrid nanoparticle mixture (0.1wt%silica+0.05wt%Alumina), 29° and 33°, respectively. Finally, coreflooding tests were conducted to study the performance of the optimal nanofluid in enhancing oil recovery. The coreflood experiment was conducted with optimum hybrid nanofluid at 80 °C. The recovery factor recorded with Caspian Seawater was 42%, and silica nanofluid improved the recovery to 46%. The injection was followed by a hybrid nanofluid, which increased the recovery factor to 73%. The results presented in this study prove that hybrid nanoparticle injection improves the performance as compared to standalone nanoparticles.
{"title":"Laboratory Investigation of Hybrid Nanoparticles Injection for Enhanced Oil Recovery Process","authors":"M. Hashmet, Peyman Peyman, Yernur Satay","doi":"10.11159/iccpe22.123","DOIUrl":"https://doi.org/10.11159/iccpe22.123","url":null,"abstract":"- Nanoparticles due to their unique characteristics are gaining attraction for enhanced oil recovery (EOR) applications. Nanoparticles during the EOR process may activate many mechanisms, particularly wettability alteration, and thus improve the recovery factor. Silica nanoparticle has been largely testified for EOR. The effect of alumina nanoparticles for EOR is also being investigated recently. Their combination may enhance their performance in wettability alteration. In this research, we studied the wettability alteration and recovery performance of the hybrid nanoparticles. A series of experiments were conducted starting from zeta potential and contact angle measurement to determine optimum concentrations of silica, alumina, and hybrid nanoparticles. After dispersing nanoparticles (alone and hybrid), solutions were homogenized using ultrasonic homogenizer. The zeta potential results showed that the silica nanofluid could stay stable for at least 3 days without the need for a stabilizer. However, a stabilizer (SDBS) is required to prepare stable alumina and hybrid nanofluid. Baseline experiments were conducted with the stabilizer to quantify the performance of the stabilizer. Later, contact angles were measured (at room temperature and 80 °C) to analyze the effect of the nanofluid on rock/oil/brine systems and to determine the optimal nanofluid concentration. The results of contact angle experiments prove that, for both temperatures (room and 80 °C), maximum alteration in wettability was shown by the hybrid nanoparticle mixture (0.1wt%silica+0.05wt%Alumina), 29° and 33°, respectively. Finally, coreflooding tests were conducted to study the performance of the optimal nanofluid in enhancing oil recovery. The coreflood experiment was conducted with optimum hybrid nanofluid at 80 °C. The recovery factor recorded with Caspian Seawater was 42%, and silica nanofluid improved the recovery to 46%. The injection was followed by a hybrid nanofluid, which increased the recovery factor to 73%. The results presented in this study prove that hybrid nanoparticle injection improves the performance as compared to standalone nanoparticles.","PeriodicalId":385356,"journal":{"name":"Proceedings of the 8th World Congress on Mechanical, Chemical, and Material Engineering","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121980840","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}
L. Sanmiquel, M. Bascompta, Nor Sidki, J. Vives, J. Lopez
Extended Abstract This research presents the case of the analysis of an accident in an aggregate processing plant through the Feyer & Williamson method [1,2]. This method was designed to allow the coding of a time sequence of up to 3 events that have preceded a given accident. These events are called Preceding Events and are characterised as determining factors for the genesis of the accident. In addition, causal factors can also be identified, which are considered to have influenced the accident but not in such a decisive way as the events. The method makes it possible to identify 4 types of events and 8 types of causal factors, as well as different types of human error that have directly influenced the origin of the accident. Results: Once all the causes and factors that directly or indirectly influence the origin of the accident analysed according to the method indicated have been identified and classified, all of them are organised graphically, which allows a quick and simple understanding of the circumstances of the accident.
{"title":"Analysis Of An Accident In The Mining Sector Using The Feyer and Williamson Method","authors":"L. Sanmiquel, M. Bascompta, Nor Sidki, J. Vives, J. Lopez","doi":"10.11159/mmme22.123","DOIUrl":"https://doi.org/10.11159/mmme22.123","url":null,"abstract":"Extended Abstract This research presents the case of the analysis of an accident in an aggregate processing plant through the Feyer & Williamson method [1,2]. This method was designed to allow the coding of a time sequence of up to 3 events that have preceded a given accident. These events are called Preceding Events and are characterised as determining factors for the genesis of the accident. In addition, causal factors can also be identified, which are considered to have influenced the accident but not in such a decisive way as the events. The method makes it possible to identify 4 types of events and 8 types of causal factors, as well as different types of human error that have directly influenced the origin of the accident. Results: Once all the causes and factors that directly or indirectly influence the origin of the accident analysed according to the method indicated have been identified and classified, all of them are organised graphically, which allows a quick and simple understanding of the circumstances of the accident.","PeriodicalId":385356,"journal":{"name":"Proceedings of the 8th World Congress on Mechanical, Chemical, and Material Engineering","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131231678","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}
– A novel approach to model sensible Thermal Energy Storage (TES) Systems has been developed. Three separate models are used to model the overall system. High-resolution isothermal models are used to simulate the flow around the inlet and outlet diffusers. Velocity data is then used to provide accurate boundary conditions for a simplified non-isothermal model to model the temperature distribution and flow in the main body of the TES. In this short paper, a laminar model is compared with 2 turbulent models and measurement data. Analysis shows the need for further work as the thermocline width increases much faster in all numerical models than seen in the measurement data.
{"title":"Modeling a Large Thermal Energy Storage System Using RANS Turbulence Models and High-Resolution Measurement Data","authors":"B. Krüger, F. Dammel, P. Stephan","doi":"10.11159/htff22.157","DOIUrl":"https://doi.org/10.11159/htff22.157","url":null,"abstract":"– A novel approach to model sensible Thermal Energy Storage (TES) Systems has been developed. Three separate models are used to model the overall system. High-resolution isothermal models are used to simulate the flow around the inlet and outlet diffusers. Velocity data is then used to provide accurate boundary conditions for a simplified non-isothermal model to model the temperature distribution and flow in the main body of the TES. In this short paper, a laminar model is compared with 2 turbulent models and measurement data. Analysis shows the need for further work as the thermocline width increases much faster in all numerical models than seen in the measurement data.","PeriodicalId":385356,"journal":{"name":"Proceedings of the 8th World Congress on Mechanical, Chemical, and Material Engineering","volume":"12 9","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133052908","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}
Danny Xavier Villalva-León, G. García-Ros, J. Sánchez-Pérez, E. Castro-Rodríguez,, María Rosa Mena-Requena, M. Conesa
Extended Abstract The detection and monitoring of acoustic emissions in soil mechanics is a study technique still little developed and investigated, although the applications that can be derived from this new discipline are very numerous. Among these, the most interesting from the geotechnical point of view are the study of soil compressibility [1] and the ground shear strength [2]. For this reason, in the Geotechnics Laboratory of the Universidad Politécnica de Cartagena (UPCT) an investigation that aims to delve into this discipline has been started, in order to find trends or correlations between the compressibility and shear parameters of the soil and the characteristics of the acoustic emissions generated by the relative movement of grains. The research is in its initial phase, although all the necessary equipment to carry it out is already available: in addition to the classic laboratory equipment (oedometric bench; uniaxial loading cell for simple compression; direct shear equipment), there is a multi-channel acoustic emission capture equipment (Vallen AMSY-6), to which a pair of low-frequency sensors (with sensitivity between 10-100 kHz) and another pair of medium-high-frequency (with sensitivity < 900 kHz) are connected.
{"title":"Acoustic Emissions Monitoring In Soil Compressibility Laboratory Tests","authors":"Danny Xavier Villalva-León, G. García-Ros, J. Sánchez-Pérez, E. Castro-Rodríguez,, María Rosa Mena-Requena, M. Conesa","doi":"10.11159/icmie22.123","DOIUrl":"https://doi.org/10.11159/icmie22.123","url":null,"abstract":"Extended Abstract The detection and monitoring of acoustic emissions in soil mechanics is a study technique still little developed and investigated, although the applications that can be derived from this new discipline are very numerous. Among these, the most interesting from the geotechnical point of view are the study of soil compressibility [1] and the ground shear strength [2]. For this reason, in the Geotechnics Laboratory of the Universidad Politécnica de Cartagena (UPCT) an investigation that aims to delve into this discipline has been started, in order to find trends or correlations between the compressibility and shear parameters of the soil and the characteristics of the acoustic emissions generated by the relative movement of grains. The research is in its initial phase, although all the necessary equipment to carry it out is already available: in addition to the classic laboratory equipment (oedometric bench; uniaxial loading cell for simple compression; direct shear equipment), there is a multi-channel acoustic emission capture equipment (Vallen AMSY-6), to which a pair of low-frequency sensors (with sensitivity between 10-100 kHz) and another pair of medium-high-frequency (with sensitivity < 900 kHz) are connected.","PeriodicalId":385356,"journal":{"name":"Proceedings of the 8th World Congress on Mechanical, Chemical, and Material Engineering","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131280958","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}
Teerapat Thungthong, Kanet Katchasuwanmanee, Jirachai Mingbunjerdsuk, W. Chaiworapuek, K. Khaothong
In this paper, heat transfer characteristics of laminar pipe flow using low frequency ultrasound released along the mainstream direction were investigated experimentally. The test section was a square duct with an inner cross-sectional area of 60 mm2 and a length of 1500 mm. The Reynolds number ranged between 400 and 1,600. A heater with a power of 400 W was installed at the bottom wall to heat the water at 23 °C. Thermocouples were used to measure the wall temperature at a distance of 0.16-0.58 m with an interval of 0.07 m. The ultrasonic transducer with a frequency of 28-80 kHz was set at the entrance to release the waves in a streamwise direction. In addition, the flow behaviour of the water flow induced by ultrasound was illustrated by Particle Image Velocimetry (PIV). The results showed that the heat transfer enhancement factor (HTEF) was increased when the heating wall was close to the ultrasonic transducer position. In particular, acoustic streaming was found to convect the heat transfer by swerving from the entrance to the heating wall. The maximum HTEF of 163.04% was achieved using 28 kHz ultrasonic waves at Reynold number of 400. These results would clearly demonstrate the potential of ultrasonic waves to improve heat transfer in a thermal system in the future.
{"title":"Heat Transfer and Velocity Measurement of Laminar Pipe Flow Induced by Ultrasound Released along Mainstream Direction","authors":"Teerapat Thungthong, Kanet Katchasuwanmanee, Jirachai Mingbunjerdsuk, W. Chaiworapuek, K. Khaothong","doi":"10.11159/htff22.163","DOIUrl":"https://doi.org/10.11159/htff22.163","url":null,"abstract":"In this paper, heat transfer characteristics of laminar pipe flow using low frequency ultrasound released along the mainstream direction were investigated experimentally. The test section was a square duct with an inner cross-sectional area of 60 mm2 and a length of 1500 mm. The Reynolds number ranged between 400 and 1,600. A heater with a power of 400 W was installed at the bottom wall to heat the water at 23 °C. Thermocouples were used to measure the wall temperature at a distance of 0.16-0.58 m with an interval of 0.07 m. The ultrasonic transducer with a frequency of 28-80 kHz was set at the entrance to release the waves in a streamwise direction. In addition, the flow behaviour of the water flow induced by ultrasound was illustrated by Particle Image Velocimetry (PIV). The results showed that the heat transfer enhancement factor (HTEF) was increased when the heating wall was close to the ultrasonic transducer position. In particular, acoustic streaming was found to convect the heat transfer by swerving from the entrance to the heating wall. The maximum HTEF of 163.04% was achieved using 28 kHz ultrasonic waves at Reynold number of 400. These results would clearly demonstrate the potential of ultrasonic waves to improve heat transfer in a thermal system in the future.","PeriodicalId":385356,"journal":{"name":"Proceedings of the 8th World Congress on Mechanical, Chemical, and Material Engineering","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120957334","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}
Omid Sam-Daliri, T. Flanagan, P. Ghabezi, W. Finnegan, Sinéad Mitchell, N. Harrison
Extended Abstract The use of fibre-reinforced polymer composites has increased in recent years across various industries, such as aircraft, energy, sports, infrastructure, medical, defence, electronics, and automobile industries [1]. In particular, carbon fibre reinforced polymers (CFRP) and glass fibre reinforced polymers (GFRP) [1, 2] regularly demonstrate favourable strength-to-weight ratios at multiple size scales. Until recently, these materials have been readily adopted without complete consideration of the environmental impacts of the entire life cycle of the product- from raw material extraction, production, use and end-of-life outcome. In addition, composite waste occurs during production processes. Thus, finding efficient, commercially viable and effective reuse, remanufacturing and recycling routes is now of crucial importance to ensure sustainable continued use of composites. In addition, it is imperative that every effort be made to reduce the amount of waste material that is either
{"title":"Recovery of Particle Reinforced Composite 3D Printing Filament from Recycled Industrial Polypropylene and Glass Fibre Waste","authors":"Omid Sam-Daliri, T. Flanagan, P. Ghabezi, W. Finnegan, Sinéad Mitchell, N. Harrison","doi":"10.11159/icmie22.143","DOIUrl":"https://doi.org/10.11159/icmie22.143","url":null,"abstract":"Extended Abstract The use of fibre-reinforced polymer composites has increased in recent years across various industries, such as aircraft, energy, sports, infrastructure, medical, defence, electronics, and automobile industries [1]. In particular, carbon fibre reinforced polymers (CFRP) and glass fibre reinforced polymers (GFRP) [1, 2] regularly demonstrate favourable strength-to-weight ratios at multiple size scales. Until recently, these materials have been readily adopted without complete consideration of the environmental impacts of the entire life cycle of the product- from raw material extraction, production, use and end-of-life outcome. In addition, composite waste occurs during production processes. Thus, finding efficient, commercially viable and effective reuse, remanufacturing and recycling routes is now of crucial importance to ensure sustainable continued use of composites. In addition, it is imperative that every effort be made to reduce the amount of waste material that is either","PeriodicalId":385356,"journal":{"name":"Proceedings of the 8th World Congress on Mechanical, Chemical, and Material Engineering","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116430916","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}
{"title":"Conjugated Phonon and Hot Carrier Transport in 2D Materials","authors":"Xinwei Wang","doi":"10.11159/htff22.001","DOIUrl":"https://doi.org/10.11159/htff22.001","url":null,"abstract":"","PeriodicalId":385356,"journal":{"name":"Proceedings of the 8th World Congress on Mechanical, Chemical, and Material Engineering","volume":"59 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127719838","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 The current study aims to simulate the complex oscillation of a long flexible cylinder. This fluid-structure interaction problem is important in ocean engineering, civil engineering and so on. For instance, a riser in ocean has to interact with the current. Another example is a cable of a bridge, which vibrates due to coming wind. An in-house numerical model was developed using pseudopsectral methods [1] coupled with the direct-forcing immersed boundary (DFIB) method [2] to investigate this phenomenon. The model was validated first by simulations of flow through a fixed cylinder in a free stream. Drag coefficients obtained by the proposed model and other publications were compared and good agreement was found. The preciseness and convergence analysis are presented in the validation section. A solid body can be identified more precisely using the adopted PSME-DFIB model. The proposed numerical model was used to simulate the flow-induced vibration of an elastically mounted rigid cylinder. The variation of vibration frequency and maximum amplitude with respect to Reynolds number and reduced velocity was investigated in the lock-in region and compared against published literature. When solids move through grids, the coordinate transformation can eliminate noise in the resultant force, as determined by the numerical integral. In addition, the in-house PSME-DFIB model was used to investigate the flow-induced vibration of an infinitely long flexible cylinder at various wavelengths, cylinder tensions at low Reynolds numbers. A short-wavelength cylinder was considered due to the feasibility of simulations. The effects of cylinder vibration on the flow patterns were also explored in detail. Given the initial displacement, the cylinder vibration was produced a stable standing wave response in the early stage, and gradually turned into
{"title":"Pseudospectral Modelling For Flow past a Long Flexible Cylinder","authors":"M. Chern, Jhe-Ming Lin","doi":"10.11159/htff22.179","DOIUrl":"https://doi.org/10.11159/htff22.179","url":null,"abstract":"Extended Abstract The current study aims to simulate the complex oscillation of a long flexible cylinder. This fluid-structure interaction problem is important in ocean engineering, civil engineering and so on. For instance, a riser in ocean has to interact with the current. Another example is a cable of a bridge, which vibrates due to coming wind. An in-house numerical model was developed using pseudopsectral methods [1] coupled with the direct-forcing immersed boundary (DFIB) method [2] to investigate this phenomenon. The model was validated first by simulations of flow through a fixed cylinder in a free stream. Drag coefficients obtained by the proposed model and other publications were compared and good agreement was found. The preciseness and convergence analysis are presented in the validation section. A solid body can be identified more precisely using the adopted PSME-DFIB model. The proposed numerical model was used to simulate the flow-induced vibration of an elastically mounted rigid cylinder. The variation of vibration frequency and maximum amplitude with respect to Reynolds number and reduced velocity was investigated in the lock-in region and compared against published literature. When solids move through grids, the coordinate transformation can eliminate noise in the resultant force, as determined by the numerical integral. In addition, the in-house PSME-DFIB model was used to investigate the flow-induced vibration of an infinitely long flexible cylinder at various wavelengths, cylinder tensions at low Reynolds numbers. A short-wavelength cylinder was considered due to the feasibility of simulations. The effects of cylinder vibration on the flow patterns were also explored in detail. Given the initial displacement, the cylinder vibration was produced a stable standing wave response in the early stage, and gradually turned into","PeriodicalId":385356,"journal":{"name":"Proceedings of the 8th World Congress on Mechanical, Chemical, and Material Engineering","volume":"234 2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132522956","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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