SCI和EI收录∣中国化工学会会刊

中国化学工程学报 ›› 2020, Vol. 28 ›› Issue (11): 2928-2937.DOI: 10.1016/j.cjche.2020.07.025

• Energy, Resources and Environmental Technology • 上一篇    下一篇

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

Amin Shahsavar1, Sajad Entezari1, Davood Toghraie2, Pouya Barnoon2   

  1. 1 Department of Mechanical Engineering, Kermanshah University of Technology, Kermanshah, Iran;
    2 Department of Mechanical Engineering, Khomeinishahr Branch, Islamic Azad University, Khomeinishahr, Iran
  • 收稿日期:2020-04-09 修回日期:2020-07-10 出版日期:2020-11-28 发布日期:2020-12-31
  • 通讯作者: Davood Toghraie

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

Amin Shahsavar1, Sajad Entezari1, Davood Toghraie2, Pouya Barnoon2   

  1. 1 Department of Mechanical Engineering, Kermanshah University of Technology, Kermanshah, Iran;
    2 Department of Mechanical Engineering, Khomeinishahr Branch, Islamic Azad University, Khomeinishahr, Iran
  • Received:2020-04-09 Revised:2020-07-10 Online:2020-11-28 Published:2020-12-31
  • Contact: Davood Toghraie

摘要: 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 thermodynamics. The 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 V. Also, 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 generation. Furthermore, it was reported that, except for φ=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 cases. Also, it can be concluded that the best hydrothermal performance for PHS belongs to φ= 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

Abstract: 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 thermodynamics. The 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 V. Also, 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 generation. Furthermore, it was reported that, except for φ=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 cases. Also, it can be concluded that the best hydrothermal performance for PHS belongs to φ= 1% and V=0.5 m·s-1, while for NHS, these values are 1% and 2 m·s-1.

Key words: Porous medium, Heat sink, First and second laws of thermodynamics, Biologically prepared water-silver nanofluid