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<p>In aerospace applications, such as spacecraft or re-entry vehicles, extreme temperatures are encountered. Radiative heat transfer is significant, and advanced cooling systems using MHD nanofluids can be crucial. The most striking feature in this is the <i>intensely glowing, orange-red plasma sheath</i> surrounding the front (blunt) part of the capsule. This glow is due to the extreme temperatures generated by the shock wave as the capsule compresses the air at hypersonic speeds. Motivated by these critical applications, this study investigates radiative heat transfer, exergy analysis on electrically conducting nanofluid flow over a porous moving wedge subject to convective surface conditions. This scenario is modeled and solved using Runge–Kutta Fehlberg method capturing the flow transport effects typically in aerospace environments. The analysis reveals that entropy generation intensifies with increasing magnetic field strength, radiation parameter, and Eckert number, indicating higher thermal irreversibility in high-temperature regimes. Conversely, stronger chemical reaction rates and thermophoretic forces tend to thin the concentration boundary layer, reducing solute-related entropy production. The optimal stretching ratio significantly enhances thermal and mass transfer, which is critical for improving the efficiency of re-entry heat shields and thermal protection systems. Thermal radiation and Biot numbers positively influence heat absorption and surface convection. Overall, entropy generation analysis offers a thermodynamic lens to evaluate and minimize irreversibility, enabling the design of sustainable, high-performance aerospace thermal systems. The findings support advancements in magnetically controlled cooling, radiative heat shields, and energy-efficient thermal regulation for high-speed vehicles and space-based platforms under extreme thermal conditions.</p>

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Activation energy-coupled entropy generation in radiative MHD nanofluid flow through porous media over a moving wedge

  • 期刊论文

  • 发表日期：

    2025年11月9日

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  • T. Poornima,
  • P. Sreenivasulu,
  • Ali J. Chamkha

摘要

In aerospace applications, such as spacecraft or re-entry vehicles, extreme temperatures are encountered. Radiative heat transfer is significant, and advanced cooling systems using MHD nanofluids can be crucial. The most striking feature in this is the intensely glowing, orange-red plasma sheath surrounding the front (blunt) part of the capsule. This glow is due to the extreme temperatures generated by the shock wave as the capsule compresses the air at hypersonic speeds. Motivated by these critical applications, this study investigates radiative heat transfer, exergy analysis on electrically conducting nanofluid flow over a porous moving wedge subject to convective surface conditions. This scenario is modeled and solved using Runge–Kutta Fehlberg method capturing the flow transport effects typically in aerospace environments. The analysis reveals that entropy generation intensifies with increasing magnetic field strength, radiation parameter, and Eckert number, indicating higher thermal irreversibility in high-temperature regimes. Conversely, stronger chemical reaction rates and thermophoretic forces tend to thin the concentration boundary layer, reducing solute-related entropy production. The optimal stretching ratio significantly enhances thermal and mass transfer, which is critical for improving the efficiency of re-entry heat shields and thermal protection systems. Thermal radiation and Biot numbers positively influence heat absorption and surface convection. Overall, entropy generation analysis offers a thermodynamic lens to evaluate and minimize irreversibility, enabling the design of sustainable, high-performance aerospace thermal systems. The findings support advancements in magnetically controlled cooling, radiative heat shields, and energy-efficient thermal regulation for high-speed vehicles and space-based platforms under extreme thermal conditions.