Miniaturization of circuitry has inherently led to higher heat dissipation which has to be controlled to avoid temperature fluctuation ensuring smooth functioning of the system where developments in the field of PCM provides flexible solutions for avionic Thermal Management (TM). This article focuses to analyse thermal performance of novel tapered triangular finned heat sink along with Vacuum Insulation Panels (VIPs) tamped with nanoalloy (n-LMA) enhanced organo-metallic Mn based layered perovskite Solid-Solid PCM (SS-PCM) to its compatibility for passive TM satellite auxiliary system. An inclusion of 5 wt% nanoalloy (Nano-encapsulated liquid Ga:In eutectic alloy) in SS-PCM increased the thermal conductivity by 21.05% (0.374 W/m-K) and charging and discharging enthalpy by 16.84% (74.56 J/g) and 17.61% (76.32 J/g) respectively. Thermo-physical property values were obtained through Field Emission Scanning Electron Microscope, Scanning Electron Microscope, Differential Scanning Calorimetry and Laser Flash Apparatus. Transient thermal performance analysis was carried out in tapered triangular finned heat sink with specific duty cycles (600s/5400s, 1200s/4800s and 1800s/4200s) for heat fluxes (2 W, 4 W, 6 W, 8 W and 10 W) and with/without VIP for different aspects of SS-PCM and SS-PCM/n-LMA. The effect of n-LMA influences the enhancement in thermal storage and heat transfer performance attributes with a maximum temperature drop of 6.98% over pure SS-PCM. Experimental study reveals better temperature reduction with a maximum of 53.81% decrement in overall heat sink temperature and VIP manifests unidirectional heat transfer through the heat sink reducing overall spatial temperature variation. Further, numerical validation was performed for obtained results with COMSOL application, demonstrating the suitability for real-time passive TM in satellite avionics space applications.

电路的小型化本质上导致更高的散热，必须对其进行控制以避免温度波动，从而确保系统的平稳运行，而PCM领域的发展为航空电子热管理（TM）提供了灵活的解决方案。本文着重分析新型锥形三角形翅片散热器的热性能，以及用纳米合金（n-LMA）增强的有机金属锰基层状钙钛矿固-固态PCM（SS-PCM）夯实的真空绝热板（VIP）用于被动TM卫星辅助系统。在SS-PCM中加入5 wt％的纳米合金（纳米封装的液态Ga：In共晶合金）可使导热系数提高21.05％（0.374 W / mK），使充电和放电焓提高16.84％（74.56 J / g），并且分别为17.61％（76.32 J / g）。通过场发射扫描电子显微镜，扫描电子显微镜，差示扫描量热法和激光闪光仪获得热物理性质值。在具有特定占空比（600s / 5400s，1200s / 4800s和1800s / 4200s）的锥形三角形翅片散热器中进行了热通量（2 W，4 W，6 W，8 W和10 W）的瞬态热性能分析带有/不带有VIP的SS-PCM和SS-PCM / n-LMA的不同方面。n-LMA的影响影响了热存储和传热性能属性的增强，与纯SS-PCM相比，最大温度下降了6.98％。实验研究表明，降温效果更好，最大降温幅度为53。整体散热器温度降低81％，VIP显示通过散热器的单向传热，从而降低了整体空间温度变化。此外，使用COMSOL应用程序对获得的结果进行了数值验证，证明了实时无源TM在卫星航空电子空间应用中的适用性。