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Effects of the porous medium and water-silver biological nanofluid on the performance of a newly designed heat sink by using first and second laws of thermodynamics

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Chinese Journal of Chemical Engineering 2020年第11期28卷 2928-2937页

作者： Amin Shahsavar Sajad Entezari Davood Toghraie pouya barnoon Department of Mechanical Engineering Kermanshah University of TechnologyKermanshahIran Department of Mechanical Engineering Khomeinishahr BranchIslamic Azad UniversityKhomeinishahrIran

The aim of this numerical investigation is to evaluate the laminar forced convection of biologically synthesized water-silver nanofluid through a heat sink(HS)filled with porous foam(PHS)using first and second laws of *** impacts of inlet velocity(V=0.5–3 m·s^-1)and volume fraction of nanofluid(φ=0–1%)on the performance metrics of HS are assessed and the outcomes are compared with those of the non-porous HS(NHS).The outcomes revealed that for both the PHS and NHS,the increase of V causes an intensification in convection coefficient,pumping power,and entropy generation due to fluid friction,while the maximum CPU temperature,thermal resistance,and entropy generation due to the heat transfer reduces by boosting ***,it was found that the augmentation of V results in intensification in convection coefficient,pumping power,overall hydrothermal performance,and frictional entropy generation,while the opposite is true for maximum CPU temperature,thermal resistance,and thermal entropy ***,it was reported that,except forφ=0.5%,the overall hydrothermal performance of NHS is better than that of PHS,while PHS has better second-law performance than NHS in all the studied ***,it can be concluded that the best hydrothermal performance for PHS belongs toφ=1%and V=0.5 m·s^-1,while for NHS,these values are 1%and 2 m·s^-1.

关键词： Porous medium Heat sink First and second laws of thermodynamics Biologically prepared water-silver nanofluid

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Numerical investigation of grooves effects on the thermal performance of helically grooved shell and coil tube heat exchanger

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Chinese Journal of Chemical Engineering 2022年第4期35卷 424-434页

作者： Mehdi Miansari Mehdi Rajabtabar Darvishi Davood Toghraie pouya barnoon Mojtaba Shirzad As'ad Alizadeh Department of Mechanical Engineering Qaemshahr BranchIslamic Azad UniversityQaemshahrIran Department of Mechanical Engineering Khomeinishahr BranchIslamic Azad UniversityKhomeinishahrIran Department of Mechanical Engineering Department of Mechanical EngineeringBabol Noshirvani University of TechnologyBabolIran Department of Mechanical Engineering Urmia UniversityUrmiaIran Department of Mechanical Engineering College of EngineeringUniversity of ZakhoZakhoIraq

Heat exchangers are integral parts of important industrial units such as petrochemicals,medicine and power *** to the importance of systems energy consumption,different modifications have been applied on heat exchangers in terms of size and *** this study,a novel heat exchanger with helically grooved annulus shell and helically coiled tube was investigated by numerical *** grooves with the same pitch of the helical coil tube and different depth are created on the inner and outer wall of annulus shell to improve the thermal performance of heat *** the first section,thermal performance of the shell and coil heat exchanger with the helical grooves on its outer shell wall was compared with same but without helical *** the second section,helically grooves created on both outer and inner wall of the annulus shell with different groove *** results showed that the heat exchanger with grooves on both inner and outer shell wall has better thermal performance up to 20%compared to the heat exchanger with grooves on only outer shell *** highest thermal performance achieves at lower flow rates and higher groove depths whereas the pressure drop did not increase significantly.

关键词： Numerical simulation Heat transfer Turbulent flow Shell and coil Helically grooved shell Heat exchanger

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Effects of the porous medium and water-silver biological nanofluid on the performance of a newly designed heat sink by usingfirst and second laws of thermodynamics

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中国化学工程学报（英文版） 2020年第11期

作者： Amin Shahsavar Sajad Entezari Davood Toghraie pouya barnoon

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Numerical investigation of grooves effects on the thermal performance of helically grooved shell and coil tube heat exchanger

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中国化学工程学报（英文版） 2022年第4期

作者： Mehdi Miansari Mehdi Rajabtabar Darvishi Davood Toghraie pouya barnoon Mojtaba Shirzad As'ad Alizadeh

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