Mohammed A. Ahmed, Ibrahim K. Alabdaly, Saad M. Hatema, Maher M. Hussein
ABSTRACT
{"title":"Numerical Investigation of Hydrothermal Performance and Entropy Generation Through Backward Facing Step Channel with Oval Rib","authors":"Mohammed A. Ahmed, Ibrahim K. Alabdaly, Saad M. Hatema, Maher M. Hussein","doi":"10.18280/ijht.410526","DOIUrl":"https://doi.org/10.18280/ijht.410526","url":null,"abstract":"ABSTRACT","PeriodicalId":13995,"journal":{"name":"International Journal of Heat and Technology","volume":"1 2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135930652","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":"Effect of Nanoparticle Material, Porosity and Thermal Radiation on Forced Convection Heat Transfer of Cu-Water and CuO-Water Nanofluids over a Stretching Sheet","authors":"Issam Rezaiguia, Ridha Mebrouk, Mahfoud Kadja","doi":"10.18280/ijht.410503","DOIUrl":"https://doi.org/10.18280/ijht.410503","url":null,"abstract":"ABSTRACT","PeriodicalId":13995,"journal":{"name":"International Journal of Heat and Technology","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135931288","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 work investigates the potential of hybrid nanoparticles suspended in pure water to enhance the thermal performance of heat exchangers at minimal weight fractions. A hybrid nanofluid consisting of 50% ZnO and 50% Al 2 O 3 nanoparticles dispersed in pure water at weight fractions of 0.1%, 0.3%, and 0.5% was prepared. An experimental rig, featuring a straight horizontal tube with a constant wall heat flux, was equipped with eight thermocouples positioned at the inlet, outlet, and along the tube's surface. The study focuses on the impact of the hybrid nanofluid on the friction factors and heat transfer coefficients within a Reynolds number range of 5000 to 20000. Observations indicate that the Nusselt number escalates with an increase in the Reynolds number through the horizontal tube, while the friction factor exhibits a converse relationship. The peak Nusselt number and friction factor were observed at a 5% mass fraction of the hybrid nanofluid. Specifically, enhancements in the Nusselt number were recorded at 9%, 11.8%, and 16.7% for the weight fractions of 0.1%, 0.3%, and 0.5% respectively. Additionally, the deviation in the friction factor was noted at 2.3%, 3.6%, and 4.1% in comparison to pure water. This study thus provides critical insights into the role of hybrid nanofluids in optimizing heat transfer in heat exchangers.
{"title":"Friction Factor and Heat Transfer Enhancement of Hybrid Nanofluids in a Heated Circular Tube","authors":"Firas Aziz Ali, Adnan M. Alsaffawi","doi":"10.18280/ijht.410530","DOIUrl":"https://doi.org/10.18280/ijht.410530","url":null,"abstract":"This work investigates the potential of hybrid nanoparticles suspended in pure water to enhance the thermal performance of heat exchangers at minimal weight fractions. A hybrid nanofluid consisting of 50% ZnO and 50% Al 2 O 3 nanoparticles dispersed in pure water at weight fractions of 0.1%, 0.3%, and 0.5% was prepared. An experimental rig, featuring a straight horizontal tube with a constant wall heat flux, was equipped with eight thermocouples positioned at the inlet, outlet, and along the tube's surface. The study focuses on the impact of the hybrid nanofluid on the friction factors and heat transfer coefficients within a Reynolds number range of 5000 to 20000. Observations indicate that the Nusselt number escalates with an increase in the Reynolds number through the horizontal tube, while the friction factor exhibits a converse relationship. The peak Nusselt number and friction factor were observed at a 5% mass fraction of the hybrid nanofluid. Specifically, enhancements in the Nusselt number were recorded at 9%, 11.8%, and 16.7% for the weight fractions of 0.1%, 0.3%, and 0.5% respectively. Additionally, the deviation in the friction factor was noted at 2.3%, 3.6%, and 4.1% in comparison to pure water. This study thus provides critical insights into the role of hybrid nanofluids in optimizing heat transfer in heat exchangers.","PeriodicalId":13995,"journal":{"name":"International Journal of Heat and Technology","volume":"141 ","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135931957","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":"Impact of Upward Turbulent Flow on Wax Deposition in Heavy Viscous Oil Pipelines: A Numerical Simulation","authors":"Oussama Benhacene, Rachid Boucetta","doi":"10.18280/ijht.410518","DOIUrl":"https://doi.org/10.18280/ijht.410518","url":null,"abstract":"ABSTRACT","PeriodicalId":13995,"journal":{"name":"International Journal of Heat and Technology","volume":"151 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135931657","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}
Farhan Lafta Rashid, Ali Basem, Mudhar A. Al-Obaidi, Sarah Abbas Jawad, Ahmed Kadhim Hussein, Bagh Ali, Mohamed Bechir Ben Hamida
The optimisation of heat transfer, which is the transition of thermal energy from regions of high temperature to those of lower temperature
{"title":"An Examination of Air-Bubble Injection Mechanisms for Optimising Heat Transfer in Industrial Applications","authors":"Farhan Lafta Rashid, Ali Basem, Mudhar A. Al-Obaidi, Sarah Abbas Jawad, Ahmed Kadhim Hussein, Bagh Ali, Mohamed Bechir Ben Hamida","doi":"10.18280/ijht.410513","DOIUrl":"https://doi.org/10.18280/ijht.410513","url":null,"abstract":"The optimisation of heat transfer, which is the transition of thermal energy from regions of high temperature to those of lower temperature","PeriodicalId":13995,"journal":{"name":"International Journal of Heat and Technology","volume":"226 ","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135930182","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}
Fabrice Parfait Nang Nkol, Ebolembang Joel Freidy, Nelson Junior Issondj Banta, Giovani Vidal Tchato Yotchou, Claude Valery Ngayihi Abbe, Ruben Martin Mouangue
{"title":"Simulating the Effect of Methanol and Spray Tilt Angle on Pollutant Emission of a Diesel Engine Using Different Turbulence Models","authors":"Fabrice Parfait Nang Nkol, Ebolembang Joel Freidy, Nelson Junior Issondj Banta, Giovani Vidal Tchato Yotchou, Claude Valery Ngayihi Abbe, Ruben Martin Mouangue","doi":"10.18280/ijht.410501","DOIUrl":"https://doi.org/10.18280/ijht.410501","url":null,"abstract":"","PeriodicalId":13995,"journal":{"name":"International Journal of Heat and Technology","volume":"23 2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135931283","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":"Thermodynamic Modelling for the Prediction and Optimisation of Long-Term Performance in Wooden Structures","authors":"Chunyan Liu, Liyan Bai","doi":"10.18280/ijht.410525","DOIUrl":"https://doi.org/10.18280/ijht.410525","url":null,"abstract":"ABSTRACT","PeriodicalId":13995,"journal":{"name":"International Journal of Heat and Technology","volume":"311 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135931669","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}
With the continuous deepening of urbanization, railway passenger stations have become the core transport nodes of cities, transporting a large number of passengers every day. However, people’s demand for thermal comfort in the environment has been gradually increasing at the same time, making thermal comfort and sustainability of the stations indispensable elements in their design. Although studies of building thermal comfort are quite rich in theory and practice, most of them focus on residential or office buildings. The specific public facilities of railway passenger stations have been studied relatively less. Therefore, this study dug into the thermal comfort of those stations from the perspective of human thermal balance and sensation. At the same time, the sustainability of thermal comfort was evaluated and analyzed by combining the structural equation model (SEM) and the Importance Performance Analysis (IPA) model, aiming to provide reference and guidance for the design and renovation of railway passenger stations in the future.
{"title":"Combining Thermodynamics with Architectural Design Concepts: Thermal Comfort and Sustainability of Railway Passenger Stations","authors":"Congyi Jin","doi":"10.18280/ijht.410529","DOIUrl":"https://doi.org/10.18280/ijht.410529","url":null,"abstract":"With the continuous deepening of urbanization, railway passenger stations have become the core transport nodes of cities, transporting a large number of passengers every day. However, people’s demand for thermal comfort in the environment has been gradually increasing at the same time, making thermal comfort and sustainability of the stations indispensable elements in their design. Although studies of building thermal comfort are quite rich in theory and practice, most of them focus on residential or office buildings. The specific public facilities of railway passenger stations have been studied relatively less. Therefore, this study dug into the thermal comfort of those stations from the perspective of human thermal balance and sensation. At the same time, the sustainability of thermal comfort was evaluated and analyzed by combining the structural equation model (SEM) and the Importance Performance Analysis (IPA) model, aiming to provide reference and guidance for the design and renovation of railway passenger stations in the future.","PeriodicalId":13995,"journal":{"name":"International Journal of Heat and Technology","volume":"38 ","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135930922","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}
Evgeny N. Neverov, Igor A. Korotkiy, Pavel S. Korotkih, Lyudmila A. Ivanova
Refrigeration units, ubiquitous in various industrial applications, necessitate refrigerants for effective heat transfer. The end of service life for these agents, predominantly fluorocarbon-based, poses significant environmental hazards, necessitating safer alternatives. To mitigate fluorine-based environmental pollution, several solutions are under exploration, with a key proposal being the utilization of natural substances, such as carbon dioxide (R744), as refrigerants. This study introduces a novel design for a refrigeration unit operating on carbon dioxide. Distinctively, the proposed unit incorporates a series of nozzles in the refrigerator compartment that spray the refrigerant directly onto the food items, thereby expediting the cooling process. The operation principle of this unit, based on direct contact between carbon dioxide and the food products, is its primary novelty. A calculation technique is proposed for the selection of unit components, enhancing the cooling efficiency by facilitating direct heat exchange between the refrigerant and the product. The design includes a 3D model of the unit, developed in accordance with the sizes of currently manufactured equipment, and a layout that ensures mobility. The implementation of a recuperation principle in the unit allows a 20% reduction in refrigerant mass consumption, while the direct contact method increases the freezing rate by 30%. The proposed utilization of R744 as a refrigerant could significantly attenuate the emission of ozone-depleting substances, thereby contributing positively to the current environmental situation.
{"title":"Development of an Energy Efficient Refrigeration Unit Using Carbon Dioxide as a Natural Refrigerant","authors":"Evgeny N. Neverov, Igor A. Korotkiy, Pavel S. Korotkih, Lyudmila A. Ivanova","doi":"10.18280/ijht.410505","DOIUrl":"https://doi.org/10.18280/ijht.410505","url":null,"abstract":"Refrigeration units, ubiquitous in various industrial applications, necessitate refrigerants for effective heat transfer. The end of service life for these agents, predominantly fluorocarbon-based, poses significant environmental hazards, necessitating safer alternatives. To mitigate fluorine-based environmental pollution, several solutions are under exploration, with a key proposal being the utilization of natural substances, such as carbon dioxide (R744), as refrigerants. This study introduces a novel design for a refrigeration unit operating on carbon dioxide. Distinctively, the proposed unit incorporates a series of nozzles in the refrigerator compartment that spray the refrigerant directly onto the food items, thereby expediting the cooling process. The operation principle of this unit, based on direct contact between carbon dioxide and the food products, is its primary novelty. A calculation technique is proposed for the selection of unit components, enhancing the cooling efficiency by facilitating direct heat exchange between the refrigerant and the product. The design includes a 3D model of the unit, developed in accordance with the sizes of currently manufactured equipment, and a layout that ensures mobility. The implementation of a recuperation principle in the unit allows a 20% reduction in refrigerant mass consumption, while the direct contact method increases the freezing rate by 30%. The proposed utilization of R744 as a refrigerant could significantly attenuate the emission of ozone-depleting substances, thereby contributing positively to the current environmental situation.","PeriodicalId":13995,"journal":{"name":"International Journal of Heat and Technology","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135931430","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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