Rakesh Kumar, A. Tiwari, P. Sihota, Dharmendra Tripathi, Navin Kumar, A. Ahmad, S. Ambwani
In silico models of bone adaptation attempted to simulate loading-induced osteogenesis (i.e. new bone formation) at cortical bone surfaces (periosteal and endocortical). These models, however, fall short in fitting the site-specific new bone formation at cortical envelops especially at endocortical surface. An anticipated reason may be that same mechanical properties were considered for both periosteal and endocortical surfaces, whereas, properties may be different and location-specific at the two surfaces. Site-specific mechanical properties at cortical bone envelops are not investigated well in the literature. This study mainly aims to characterize mechanical properties (especially viscoelastic properties) at periosteal and endocortical surfaces of Wistar rats femora using Dynamic Mechanical Analysis (DMA). Viscoelastic properties such as storage and loss moduli are estimated. Properties are also compared along anterior, posterior, medial, and lateral sites of cortex at both surfaces. Experimental outcomes indicate that periosteal surface has higher stiffness than endocortical surface across all the anatomical locations, in which, medial region had highest stiffness at the two surfaces. These findings may be useful in developing advanced computer models to precisely predict osteogenesis which may help clinicians in providing informed recommendation on biomechanical strategies such as physical exercise to treat site-specific bone loss.
{"title":"Investigation on Viscoelastic Properties of Cortical Surfaces Using Dynamic Mechanical Analysis","authors":"Rakesh Kumar, A. Tiwari, P. Sihota, Dharmendra Tripathi, Navin Kumar, A. Ahmad, S. Ambwani","doi":"10.2139/ssrn.3101404","DOIUrl":"https://doi.org/10.2139/ssrn.3101404","url":null,"abstract":"In silico models of bone adaptation attempted to simulate loading-induced osteogenesis (i.e. new bone formation) at cortical bone surfaces (periosteal and endocortical). These models, however, fall short in fitting the site-specific new bone formation at cortical envelops especially at endocortical surface. An anticipated reason may be that same mechanical properties were considered for both periosteal and endocortical surfaces, whereas, properties may be different and location-specific at the two surfaces. Site-specific mechanical properties at cortical bone envelops are not investigated well in the literature. This study mainly aims to characterize mechanical properties (especially viscoelastic properties) at periosteal and endocortical surfaces of Wistar rats femora using Dynamic Mechanical Analysis (DMA). Viscoelastic properties such as storage and loss moduli are estimated. Properties are also compared along anterior, posterior, medial, and lateral sites of cortex at both surfaces. Experimental outcomes indicate that periosteal surface has higher stiffness than endocortical surface across all the anatomical locations, in which, medial region had highest stiffness at the two surfaces. These findings may be useful in developing advanced computer models to precisely predict osteogenesis which may help clinicians in providing informed recommendation on biomechanical strategies such as physical exercise to treat site-specific bone loss.","PeriodicalId":198407,"journal":{"name":"IRPN: Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128009189","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 aim of this paper is to study zirconia and its composites. Various techniques to synthesize zirconia films and its composites have been discussed in detail. Literatures have been studied extensively covering over 35 years of investigation on various doping materials, effect of physical and chemical parameters on synthesis of zirconia, its composites and various mixed metal oxides. This is very important from a research point of view, as the selection of metal oxides should be a strong evidence to support the electrical, chemical, mechanical and optical applications. The search for the ideal zirconia based metal oxide that has good performance and longevity will continue.
{"title":"Synthesis, Characterization and Properties Evaluation of ZrO2 and Its Composites – A Review","authors":"C. Srikanth, G. Madhu","doi":"10.2139/ssrn.3101419","DOIUrl":"https://doi.org/10.2139/ssrn.3101419","url":null,"abstract":"The aim of this paper is to study zirconia and its composites. Various techniques to synthesize zirconia films and its composites have been discussed in detail. Literatures have been studied extensively covering over 35 years of investigation on various doping materials, effect of physical and chemical parameters on synthesis of zirconia, its composites and various mixed metal oxides. This is very important from a research point of view, as the selection of metal oxides should be a strong evidence to support the electrical, chemical, mechanical and optical applications. The search for the ideal zirconia based metal oxide that has good performance and longevity will continue.","PeriodicalId":198407,"journal":{"name":"IRPN: Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122538052","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}
This project work involves experimental investigation of intake valve to generate swirling of air fuel mixture inside cylinder for Direct Injection (D.I) diesel engine. Three different types of intake valves having different configuration on its face are studied. The average swirl number and flow coefficient is obtained using a paddle wheel test bench. Swirl ratio is the ratio of rotary speed of the paddle wheel in a swirl measurement test rig, to the engine speed as calculated by measuring flow rate of intake air. The second part of work focused on the Computation Fluid Dynamics (CFD) to study flow distribution and flow velocity inside cylinder. The simulations are carried out on different valve lifts ranging from 4mm to 13mm on Ansys 16. Intake valves with four blades on valve seat shows better results for swirl ratio and flow coefficient in one of the cases when compared to base geometry. With this modification in intake valve results of this work shows improvement in swirl generation and flow distribution.
{"title":"Study of Flow Characteristics of Air in DI Diesel Engine by Modification in Intake Valve","authors":"Akshay Pofalkar, N. Borse, D. Hulwan","doi":"10.2139/ssrn.3102078","DOIUrl":"https://doi.org/10.2139/ssrn.3102078","url":null,"abstract":"This project work involves experimental investigation of intake valve to generate swirling of air fuel mixture inside cylinder for Direct Injection (D.I) diesel engine. Three different types of intake valves having different configuration on its face are studied. The average swirl number and flow coefficient is obtained using a paddle wheel test bench. Swirl ratio is the ratio of rotary speed of the paddle wheel in a swirl measurement test rig, to the engine speed as calculated by measuring flow rate of intake air. The second part of work focused on the Computation Fluid Dynamics (CFD) to study flow distribution and flow velocity inside cylinder. The simulations are carried out on different valve lifts ranging from 4mm to 13mm on Ansys 16. Intake valves with four blades on valve seat shows better results for swirl ratio and flow coefficient in one of the cases when compared to base geometry. With this modification in intake valve results of this work shows improvement in swirl generation and flow distribution.","PeriodicalId":198407,"journal":{"name":"IRPN: Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128530248","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}
Condition monitoring using vibration measurement is a most commonly used non-destructive technique. This paper proposes application of statistical features of vibration signal for gear defect diagnosis. The advanced signal processing of acquired signals to find the most significant features of the defects in gear system is the aim of the present work. An experimental investigation that examines the diagnostic potential of multidomain features for gear teeth defect identification is presented. It is concluded that db44 is a better mother wavelet function in the time - frequency domain as compared to db4 or db10, while standard deviation, variance and an absolute maximum of continuous wavelet transform and discrete wavelet transform are better features for gear defect identification in addition to conventional time and frequency domain features for training purposes of intelligence systems.
{"title":"Effective Gear Teeth Defect Identification Using Multi-Domain Feature Extraction","authors":"L. Dhamande, M. Chaudhari","doi":"10.2139/ssrn.3101371","DOIUrl":"https://doi.org/10.2139/ssrn.3101371","url":null,"abstract":"Condition monitoring using vibration measurement is a most commonly used non-destructive technique. This paper proposes application of statistical features of vibration signal for gear defect diagnosis. The advanced signal processing of acquired signals to find the most significant features of the defects in gear system is the aim of the present work. An experimental investigation that examines the diagnostic potential of multidomain features for gear teeth defect identification is presented. It is concluded that db44 is a better mother wavelet function in the time - frequency domain as compared to db4 or db10, while standard deviation, variance and an absolute maximum of continuous wavelet transform and discrete wavelet transform are better features for gear defect identification in addition to conventional time and frequency domain features for training purposes of intelligence systems.","PeriodicalId":198407,"journal":{"name":"IRPN: Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133739142","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 gas micro flows are deployed in heat-sinks of many practical micro devices, and cooling systems for gas turbine blades etc. In present study, fluid friction characteristics of laminar micro flow, operating at low Reynolds number, are studied. This flow model is representative of fluid flows in many micro device applications. Fanning friction factor computations were re-modeled using ‘entropy generation’ and ‘axial temperature rise’ in the flow domain. Entropy generation considerations and adiabatic wall boundary condition isolate viscous dissipation effects from other causes of heating. Navier-Stoke and energy equations were numerically solved for constant properties gas (air) flow in circular micro pipe using ANSYS/FLUENT® software and post processing in C++. The results of present study show good agreement with the well established classical Hagen-Poiseuille correlations, experimentally validated methods of Morini, and Celata et al. Present method is useful where the laboratory facilities for micro flow experiments are not available.
{"title":"An Alternate Approach to Friction Factor Computations Based on Entropy Generation in Gas Micro Flows","authors":"S. Prabhu, S. Mahulikar","doi":"10.2139/ssrn.3101266","DOIUrl":"https://doi.org/10.2139/ssrn.3101266","url":null,"abstract":"The gas micro flows are deployed in heat-sinks of many practical micro devices, and cooling systems for gas turbine blades etc. In present study, fluid friction characteristics of laminar micro flow, operating at low Reynolds number, are studied. This flow model is representative of fluid flows in many micro device applications. Fanning friction factor computations were re-modeled using ‘entropy generation’ and ‘axial temperature rise’ in the flow domain. Entropy generation considerations and adiabatic wall boundary condition isolate viscous dissipation effects from other causes of heating. Navier-Stoke and energy equations were numerically solved for constant properties gas (air) flow in circular micro pipe using ANSYS/FLUENT® software and post processing in C++. The results of present study show good agreement with the well established classical Hagen-Poiseuille correlations, experimentally validated methods of Morini, and Celata et al. Present method is useful where the laboratory facilities for micro flow experiments are not available.","PeriodicalId":198407,"journal":{"name":"IRPN: Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129275833","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}
In India open sun crop drying is very popular technique for drying, however solar air dryers are used for crop drying in many places. The solar air dryers are designed and fabricated for a particular crop and have limited usage. The solar air dryers are available in different sizes and configurations. The solar dryer performance depends on various input parameters such as inlet temperature of the air, type of absorber material, type of configuration of solar air dryer, mass flow rate of air, overall heat transfer coefficient, solar radiation, etc. The present article discusses the effects of various parameters on the useful heat gain, instantaneous thermal efficiency of solar air dryer, temperature rise with change in mass flow rate of air, input air temperature, overall heat transfer coefficient and solar air collector area. It is observed that the optimum mass flow rate of air for maximum useful heat gain is 0.05 kg/s. Further, increase in the area will not yield any advantage for overall heat gain. The instantaneous thermal efficiency for various mass flow rates is around 88%. The overall heat transfer effect increases the instantaneous thermal efficiency up to 0.1 kg/s air mass flow rate and thereafter no significant change in the efficiency. The input air temperatures do not yield much effect on the useful heat gain and rise in temperature.
{"title":"Performance Analysis of Solar Air Dryer for Multi Crop Drying – Effect of Varying Air Mass Flow Rate","authors":"Mitul Y Doshi, Aman Jain, K. Patil","doi":"10.2139/ssrn.3101275","DOIUrl":"https://doi.org/10.2139/ssrn.3101275","url":null,"abstract":"In India open sun crop drying is very popular technique for drying, however solar air dryers are used for crop drying in many places. The solar air dryers are designed and fabricated for a particular crop and have limited usage. The solar air dryers are available in different sizes and configurations. The solar dryer performance depends on various input parameters such as inlet temperature of the air, type of absorber material, type of configuration of solar air dryer, mass flow rate of air, overall heat transfer coefficient, solar radiation, etc. The present article discusses the effects of various parameters on the useful heat gain, instantaneous thermal efficiency of solar air dryer, temperature rise with change in mass flow rate of air, input air temperature, overall heat transfer coefficient and solar air collector area. It is observed that the optimum mass flow rate of air for maximum useful heat gain is 0.05 kg/s. Further, increase in the area will not yield any advantage for overall heat gain. The instantaneous thermal efficiency for various mass flow rates is around 88%. The overall heat transfer effect increases the instantaneous thermal efficiency up to 0.1 kg/s air mass flow rate and thereafter no significant change in the efficiency. The input air temperatures do not yield much effect on the useful heat gain and rise in temperature.","PeriodicalId":198407,"journal":{"name":"IRPN: Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132421055","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}
M. Kothari, Yogesh S. Gaikhe, Taha Khot, A. S. Rao, A. Tewari
Machining is complex, high strain-rate and high strain deformation/fracture process. It is also a strong function of the crystal structure of the work piece and its orientation with respect to cutting direction. The effect of crystallographic orientation on cutting forces for single crystal material has been studied by many researchers in the past. However, a study of the same in polycrystal grains and effect of grain boundary (GB) is limited. Hence this work focuses on the effect of grain orientation on forces during scratch experiments on commercially pure aluminum. Heat treatment cycles were applied to grow coarse grains (100-500 um) in the aluminum alloy. The crystallographic structure was determined by Electron Backscatter Diffraction and was used as a basis for scratch experiments. The forces required to perform scratch were measured for different grain orientations and grain boundaries. The measured forces were rationalized based on the underlining grain crystallography and scratch direction.
{"title":"Effect of Grain Orientation on Scratch Testing","authors":"M. Kothari, Yogesh S. Gaikhe, Taha Khot, A. S. Rao, A. Tewari","doi":"10.2139/ssrn.3101693","DOIUrl":"https://doi.org/10.2139/ssrn.3101693","url":null,"abstract":"Machining is complex, high strain-rate and high strain deformation/fracture process. It is also a strong function of the crystal structure of the work piece and its orientation with respect to cutting direction. The effect of crystallographic orientation on cutting forces for single crystal material has been studied by many researchers in the past. However, a study of the same in polycrystal grains and effect of grain boundary (GB) is limited. Hence this work focuses on the effect of grain orientation on forces during scratch experiments on commercially pure aluminum. Heat treatment cycles were applied to grow coarse grains (100-500 um) in the aluminum alloy. The crystallographic structure was determined by Electron Backscatter Diffraction and was used as a basis for scratch experiments. The forces required to perform scratch were measured for different grain orientations and grain boundaries. The measured forces were rationalized based on the underlining grain crystallography and scratch direction.","PeriodicalId":198407,"journal":{"name":"IRPN: Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134356201","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}
3D Printing is a layered manufacturing process that builds prototypes by depositing material in layered form using heaters. Prototypes made by 3D Printing are widely used in product development as they can be used for product testing. Prototypes should have a very good mechanical property for functional performance as well as aesthetics. The mechanical properties in 3D printing depends upon different process parameters, namely Layer Thickness, Nozzle Diameter, Infill Density, Part Bed Temperature, Skin Thickness, Raster Angle of Deposition, Raster Width and Length of the parts. In this present work, an attempt has been made to improve the mechanical property, tensile strength of prototypes of Acrylonitrile Butadiene Styrene (ABS) parts fabricated using Fused Deposition Modelling process of 3D Printing. Experiments are conducted using Taguchi’s design of experiments with three levels for each factor. Experiments were carried out on FDM Accucraft i250 machines coupled with KIS-Slicer software and ABS as main material. Parameter effect on tensile strength and there interaction are studied in taguchi method. Using Particle Swarm Optimization (PSO) algorithm optimal values of process parameter are found studied for maximum tensile strength.
{"title":"Parametric Optimization of Fused Deposition Modelling (FDM) Process Using PSO Algorithm","authors":"Aniket Shirke, C. Choudhari, S. Rukhande","doi":"10.2139/ssrn.3101978","DOIUrl":"https://doi.org/10.2139/ssrn.3101978","url":null,"abstract":"3D Printing is a layered manufacturing process that builds prototypes by depositing material in layered form using heaters. Prototypes made by 3D Printing are widely used in product development as they can be used for product testing. Prototypes should have a very good mechanical property for functional performance as well as aesthetics. The mechanical properties in 3D printing depends upon different process parameters, namely Layer Thickness, Nozzle Diameter, Infill Density, Part Bed Temperature, Skin Thickness, Raster Angle of Deposition, Raster Width and Length of the parts. In this present work, an attempt has been made to improve the mechanical property, tensile strength of prototypes of Acrylonitrile Butadiene Styrene (ABS) parts fabricated using Fused Deposition Modelling process of 3D Printing. Experiments are conducted using Taguchi’s design of experiments with three levels for each factor. Experiments were carried out on FDM Accucraft i250 machines coupled with KIS-Slicer software and ABS as main material. Parameter effect on tensile strength and there interaction are studied in taguchi method. Using Particle Swarm Optimization (PSO) algorithm optimal values of process parameter are found studied for maximum tensile strength.","PeriodicalId":198407,"journal":{"name":"IRPN: Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116817496","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}
Uddipta Gautam, S. Jha, S. Narayanan, L. Kumarswamidhas
The present study compares the aerodynamic and aeroacoustic behavior of the flow past two flat plate airfoils; viz. blunted trailing edge and sharp trailing edge, having a fixed aspect ratio of 1.867. The study is performed experimentally showing variance in lift and drag at two different velocity of 20m/s and 30m/s and at different angles of attack, viz. 5°, 12°, 20°, 25°, 30°. All the models are prepared by mild steel and the studies are conducted using 300×300×1000 mm subsonic wind tunnel. Results show that the drag coefficient in sharp trailing edge reduces significantly by a maximum amount of 22%. The lift coefficient, however, does not change significantly. Uncertainty analysis performed shows that maximum percentage of uncertainty in each case is less than 5%. Aero acoustic measurement of the noise radiated by the trailing edge of the two flat plates is performed in a reflecting environment at a velocity of 20m/s and at two different angles of attack of 10° and 15° with ¼’’ inch far field microphone mounted near the trailing edge of the airfoil in the test section. The spectra obtained indicate that the noise from the sharp trailing edge is consistently lower than the blunt trailing edge. Thus, this paper adequately demonstrates the role of trailing edge in modifying the aerodynamic as well as aero acoustic characteristic.
{"title":"Comparative Study of Aerodynamic and Aeroacoustic Behavior of Flat Plate Airfoils With Different Trailing Edge Geometry","authors":"Uddipta Gautam, S. Jha, S. Narayanan, L. Kumarswamidhas","doi":"10.2139/ssrn.3101286","DOIUrl":"https://doi.org/10.2139/ssrn.3101286","url":null,"abstract":"The present study compares the aerodynamic and aeroacoustic behavior of the flow past two flat plate airfoils; viz. blunted trailing edge and sharp trailing edge, having a fixed aspect ratio of 1.867. The study is performed experimentally showing variance in lift and drag at two different velocity of 20m/s and 30m/s and at different angles of attack, viz. 5°, 12°, 20°, 25°, 30°. All the models are prepared by mild steel and the studies are conducted using 300×300×1000 mm subsonic wind tunnel. Results show that the drag coefficient in sharp trailing edge reduces significantly by a maximum amount of 22%. The lift coefficient, however, does not change significantly. Uncertainty analysis performed shows that maximum percentage of uncertainty in each case is less than 5%. Aero acoustic measurement of the noise radiated by the trailing edge of the two flat plates is performed in a reflecting environment at a velocity of 20m/s and at two different angles of attack of 10° and 15° with ¼’’ inch far field microphone mounted near the trailing edge of the airfoil in the test section. The spectra obtained indicate that the noise from the sharp trailing edge is consistently lower than the blunt trailing edge. Thus, this paper adequately demonstrates the role of trailing edge in modifying the aerodynamic as well as aero acoustic characteristic.","PeriodicalId":198407,"journal":{"name":"IRPN: Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122017584","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}
Vapour compression refrigeration (VCR) system was designed, developed and fabricated for testing alternative refrigerants such as R152a, R600a, R290 and mixture of R290/R600a (50/50 by wt %) over presently used R134a with aluminium minichannel condenser. In the test set up, heater bank was provided for controlling condensation temperature and evaporator temperature along with sub-cooling and superheating temperature by using PID controllers. All the refrigerants were tested for condensation temperature ranging from 40 to 55 °C while evaporation temperature ranges from -15 to 15 °C. Refrigerant charge was reduced drastically with the minichannel condenser over the conventional condenser. Two phase condensation heat transfer coefficient correlation was developed from the experimental data points to design minichannel and conventional condenser and found in good agreement with the existing well known correlations.
{"title":"Two Phase Heat Transfer Coefficient for Minichannel Condensers","authors":"V. Bhatkar, V. Kriplani, G. Awari","doi":"10.2139/ssrn.3101285","DOIUrl":"https://doi.org/10.2139/ssrn.3101285","url":null,"abstract":"Vapour compression refrigeration (VCR) system was designed, developed and fabricated for testing alternative refrigerants such as R152a, R600a, R290 and mixture of R290/R600a (50/50 by wt %) over presently used R134a with aluminium minichannel condenser. In the test set up, heater bank was provided for controlling condensation temperature and evaporator temperature along with sub-cooling and superheating temperature by using PID controllers. All the refrigerants were tested for condensation temperature ranging from 40 to 55 °C while evaporation temperature ranges from -15 to 15 °C. Refrigerant charge was reduced drastically with the minichannel condenser over the conventional condenser. Two phase condensation heat transfer coefficient correlation was developed from the experimental data points to design minichannel and conventional condenser and found in good agreement with the existing well known correlations.","PeriodicalId":198407,"journal":{"name":"IRPN: Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132073821","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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