Conjugate entropy generation and heat transfer of a dilute suspension of nano-encapsulated phase change material in a partially heated wall cavity

Authors

  • Mehdi Ghalambaz College of Engineering, Almaaqal University, Basra 61003, Iraq
  • Masoud Mozaffari Department of Mechanical Engineering, Najafabad Branch, Islamic Azad University, Najafabad 85141-43131, Iran
  • Shima Yazdani Laboratory on Convective Heat and Mass Transfer, Tomsk State University, 634050 Tomsk, Russia
  • Mohammad Abbaszadeh Mechanical Engineering Department, Shiraz University, Shiraz, Iran
  • Mikhail Sheremet Laboratory on Convective Heat and Mass Transfer, Tomsk State University, 634050 Tomsk, Russia
  • Mohammad Ghalambaz Laboratory on Convective Heat and Mass Transfer, Tomsk State University, 634050 Tomsk, Russia

DOI:

https://doi.org/10.31181/rme040115092023g

Keywords:

Suspensions, Nano-encapsulated phase change material (NEPCM), Conjugate free convection, Fusion temperature, Entropy generation

Abstract

The present study offers a comprehensive simulation of conjugate heat transfer, entropy generation, and natural convection in a two-dimensional cavity filled with a water-NEPCM suspension flanked by thermally conductive solid blocks along the bottom and top walls. Utilizing weighted finite element methods on non-uniform grids, the governing equations were solved. The study varied key non-dimensional parameters like Rayleigh number (Ra), normalized block height (LY), and NEPCM concentration. Key findings reveal that entropy generation and Nusselt number are intricately dependent on Ra and LY, with the associated exponent for Ra approaching a canonical value of 1/3 as LY ranges from 0.05 to 0.2. Contrary to expectations, entropy generation does not invariably rise with LY; rather, an optimal LY value close to 0.2 maximizes heat transfer while minimizing entropy generation. Furthermore, increased thermal conductivity ratio (Rk) and NEPCM concentration increase the rate of heat transfer and generation of entropy. Nanoparticle fusion temperature is significant in a certain range of 0.4-0.6, containing optimal heat transfer rates.

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Published

2023-09-15

How to Cite

Ghalambaz, M., Mozaffari, M., Yazdani, S., Abbaszadeh, M., Sheremet, M., & Ghalambaz, M. (2023). Conjugate entropy generation and heat transfer of a dilute suspension of nano-encapsulated phase change material in a partially heated wall cavity. Reports in Mechanical Engineering, 4(1), 175–192. https://doi.org/10.31181/rme040115092023g

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Vol. 4 No. 1 (2023): Reports in Mechanical Engineering

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