Effect of mesh wick geometry on the maximum heat transfer rate of flat-micro heat pipes with multi-heat sources and sinks

Abstract

This paper presents a theoretical investigation of the thermal characteristics of flat-micro heat pipes (FMHPs) with multi-heat sources and sinks. Analytical solutions of the pressure and the temperature distributions of FMHPs with multi-heat sources and sinks were obtained based on the modified liquid pressure drop. The solutions were used to identify the key engineering parameters of a mesh wick with microscale length that affect the maximum heat transfer rate of the FMHPs with multi-heat sources and sinks. The effects of the key engineering parameters on the maximum heat transfer rate of the FMHPs were presented for two limits. The first limit is the capillary limit and the other is the allowable maximum temperature limit which is used to ensure that the maximum surface temperature of the FMHP with the maximum heat transfer rate calculated at the capillary limit does not exceed the allowable maximum temperature of the electronic components. Finally, the theoretically results for the optimized wick structure for the corresponding maximum heat transfer rate and the surface temperature distribution of the FMHP were compared for the capillary limit only and for the maximum temperature limit cases, respectively.

Experimental research on structure parameters of the ultra-thin flattened heat pipe

“…化、超薄化方向的不断突破, 也使其成为解决当前电 子设备在狭小空间内高热流密度散热问题的理想方 案 [3] . 目前, 超薄热管已广泛应用于微小型电子器件的 散热中, 如智能手机、平板电脑、智能手表、便携式 投影仪等 [4] [5,6] 、编织丝网 [7,8] 、各种截 面形状的沟槽吸液芯结构 [9,10] 和由两种或多种单一结 构组合成的复合吸液芯结构 [11,12] . 吸液芯结构是热管 Aoki等人 [15] 以铜丝网为吸液芯结构制备了厚度分别为 0.7和1 mm的两款长度分别为100和150 mm的超薄热 管, 实验测试其最大传热量分别可达到7和20 W. Singh 等人 [16] 以铜纤维作为吸液芯结构开发了一款用于解决 高热流密度电子散热的压扁型超薄热管.…”

Permeability of Single‐Layer‐Free‐Standing Meshes at Varying Capillary Pressure via a Novel Method

“…To measure in-plane intrinsic permeability of meshes, researchers have developed methods considering stacks of meshes submerged in a liquid to understand how different characteristics of the mesh, such as the number of layers, wire diameter and spacing, crimping factor, mesh thickness, and stacking density, can influence single-phase flow through the mesh. [23][24][25][26][27][28][29][30] The results of these studies have contributed to the development of models, such as the modified Blake-Kozeny equation, which can predict the intrinsic permeability of metal meshes for certain configurations. However, both the measurement methods and mathematical models may not be accurate for very thin stacks of mesh and do not address meshes with free surfaces.…”

Experimental Investigation on a Novel Necking Heat Pipe with Double-End Heating for Thermal Management of the Overload Operation

“…Hence, there were many reported investigations about multiple heat sources in thermal management by many researchers around the world. Some investigations mainly aimed at the theoretical deduction and simulation of the steam pressure distribution and surface temperature distribution in the thermal management systems, including single heat source and multiple heat source systems [20][21][22]. Bimal Subedi and his coworkers [21] proposed a theoretical investigation of a heat pipe system with multiple heat sources.…”

“…Some investigations mainly aimed at the theoretical deduction and simulation of the steam pressure distribution and surface temperature distribution in the thermal management systems, including single heat source and multiple heat source systems [20][21][22]. Bimal Subedi and his coworkers [21] proposed a theoretical investigation of a heat pipe system with multiple heat sources. The results indicated that the optimized key factors of wicks could be obtained for the threshold critical power of the heat pipe system with multiple heat sources.…”