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CFD-Based Simulation and Analysis of hydrothermal aspects in Solar Channel Heat Exchangers with Various Designed Vortex Generators

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Computer Modeling in Engineering & Sciences 2021年第1期126卷 147-173页

作者： Mohamed Salmi Younes Menni Ali J.Chamkha HouariAmeur Rachid Maouedj Ahmed Youcef Department of Physics University of M’silaM’sila28000Algeria Laboratory of Physics and Chemistry of Materials University of M’silaM’sila28000Algeria Unit of Research on Materials and Renewable Energies Department of PhysicsAbou Bekr Belkaid UniversityTlemcen13000Algeria Faculty of Engineering Kuwait College of Science and TechnologyDoha DistrictKuwait Center of Excellence in Desalination Technology King Abdulaziz UniversityJeddah21589Saudi Arabia Department of Technology University Center of NaamaNaama45000Algeria Unite de Recherche en Energies Renouvelables en Milieu Saharien URERMSCentre de Developpement des Energies RenouvelablesCDERAdrar01000Algeria

The hydrothermal behavior of air inside a solar channel heat exchanger equipped with various shaped ribs is analyzed *** bottom wall of the exchanger is kept adiabatic,while a constant value of the temperature is set at the upper *** duct is equipped with a flat rectangular fin on the upper wall and an upstream V-shaped baffle on the lower ***,five hot wall-attached rib shapes are considered:trapezoidal,square,triangular pointing upstream(type Ⅰ),triangular pointing downstream(type Ⅱ),and equilateral-triangular(type Ⅲ)cross *** of the flow rates are also inspected for various Reynolds numbers in the turbulent regime(1.2×10^(4)-3.2×10^(4)).The highest performance(η)value is given for the Ⅱ-triangular rib case in all Re values,while the square-shaped ribs show a significant decrease in the η along the achieved Re *** η value at Remax is 2.567 for the Ⅱ-triangular roughness *** with the other simulated cases,this performance is decreased by about 3.768%in the case of Ⅰ-triangular ribs,15.249% in the case of Ⅲ-triangular ribs,20.802% in the case of trapezoidal ribs,while 27.541% in the case of square ribs,at the same ***,a comparison ismade with air-heat exchangers that have non-rough walls and contain cross-shaped VGs presented previously,in order to highlight the effectiveness of the rough surface presence in the baffled and finned *** obtained results indicated that the triangular-shaped rib(type Ⅱ)has the most significant hydrothermal behavior than the other *** indicates the necessity of roughness heat transfer surfaces for finned and baffled channels to improve significantly the performance of the air-heat exchangers they contain.

关键词： CFD heat exchanger vortex generators ribs hydrothermal aspects

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hydrothermal and entropy generation specifications of a hybrid ferronanofluid in microchannel heat sink embedded in CPUs

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Chinese Journal of Chemical Engineering 2021年第4期34卷 27-38页

作者： Amin Shahsavar Majid Jafari Pouyan Talebizadehsardari Davood Toghraie Department of Mechanical Engineering Kermanshah University of TechnologyKermanshahIran Metamaterials for Mechanical Biomechanical and Multiphysical Applications Research GroupTon Duc Thang UniversityHo Chi Minh CityVietnam Faculty of Applied Sciences Ton Duc Thang UniversityHo Chi Minh CityVietnam Department of Mechanical Engineering Khomeinishahr BranchIslamic Azad UniversityKhomeinishahrIran

The objective of this numerical work is to evaluate the first law and second law performances of a hybrid nanofluid flowing through a liquidcooled microchannel *** waterbased hybrid nanofluid includes the Fe_(3)O_(4)and carbon nanotubes(CNTs)*** heatsink includes a microchannel configuration for the flow field to gain heat from a processor placed on the bottom of the *** effects of Fe_(3)O_(4)concentration(φFe_(3)O_(4))>CNT concentration(φCNT)and Reynolds number(Re)on the convective heat transfer coefficient,CPU surface temperature,thermal resistance,pumping power,as well as the rate of entropy generation due to the heat transfer and fluid friction is *** results indicated higher values of convective heat transfer coefficient,pumping power,and frictional entropy generation rate for higher values of Re,Fe_(3)O_(4)andφ*** increasing Re,Fe_(3)O_(4)and uCNT,the CPU surface temperature and the thermal resistance decrease,and the temperature distribution at the CPU surface became more *** achieve the maximum performance of the studied heatsink,applying the hybrid nanofluid with low Fe_(3)O_(4)andφCNT was suggested,while the minimum entropy generation was achieved with the application of nanofluid with highφFe_(3)O_(4)andφCNT.

关键词： Liquid-cooled heatsink hydrothermal aspects Irreversibility Hybrid nanofluid Carbon nanotube Fe_(3)O_(4)

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