This study tackles a complicated heat transfer problem about the cooling capability of a confined slot NEPCM-water suspension
impinging jet for cooling a hot surface within the mixed convective region (with Ri = ۱ and Re = ۱۰۰ and ۳۰۰). A NEPCM-water slurry comprises nano-sized capsules containing phase change material particles dispersed in a water-based solution. The cooling medium involves a porous metal foam (Da = ۰.۰۰۱), and the entire configuration is subjected to a uniform magnetic field that satisfies the laminar region (Ha = ۵۰, λ = -۷۵°) and electric field (between the surface and confining wall). The non-dimensional governing equations of both the fluid and electromagnetic field are solved by ANSYS Fluent. This involves implementing a nondimensionalization scheme and incorporating additional partial differential equations (PDEs) into the code. Additionally, memory allocation is optimized for efficient execution. Flow patterns, isotherms, heat capacity ratio, entropy generation components, and Bejan number are computed for both water and a ۲% NEPCM-water suspension. The findings indicate that increasing the Reynolds number from ۱۰۰ to ۳۰۰, coupled with the introduction of electromagnetic fields (EMF) enhances Nuave by ۶۷.۱% for the NEPCM-water slurry. However, this increase in heat transfer is accompanied by a proportional rise in entropy generation under
EMF at Re = ۳۰۰. Interestingly, the simultaneous application of electric and magnetic fields results in a notable reduction in entropy generation, with Ngen decreasing by ۳۵% and ۱۴% for the NEPCM-water suspension at Re = ۱۰۰ and ۳۰۰, respectively, compared to pure water. Moreover, the average Bejan number (Beave) exhibits a decreasing trend with increasing Reynolds numbers, indicating a diminishing relative importance of heat transfer irreversibility. By the introduction of EMF, Beave demonstrates a ۳۵.۹% decline for
NEPCM suspension at Da = ۰.۰۰۱ as Re increases from ۱۰۰ to ۳۰۰. These results underscore the complex interplay among fluid dynamics, electromagnetic fields, and entropy generation in
impinging jet systems, offering effective understandings for improving heat transfer methods across many industrial applications.
