Conjugate entropy generation and heat transfer of a dilute suspension of nano-encapsulated phase change material in a partially heated wall cavity
Keywords:Suspensions, Nano-encapsulated phase change material (NEPCM), Conjugate free convection, Fusion temperature, Entropy generation
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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