Enhanced capillary performance in axially grooved aluminium wicks by alkaline corrosion treatment
Enhanced capillary performance in axially grooved aluminium wicks by alkaline corrosion treatment
复制标题
DOI：
10.1016/j.expthermflusci.2016.11.020
复制
发表时间：
2017-04-01
影响因子：
3.2
通讯作者：
Lu, Longsheng
中科院分区：
文献类型：
--
作者：
Huang, Guanghan;Yuan, Wei;Lu, Longsheng
本文介绍了一种对轴向开槽铝芯进行碱腐蚀处理的方法，它显著提高了轴向开槽铝芯的毛细性能，并增加了轴向开槽铝热管在空间或水平方向上的适用性。考察了腐蚀参数(摩尔浓度和反应时间)对毛细管性能的影响。利用红外热像仪建立了一套毛细管上升速率测试装置，用于测量腐蚀芯材的毛细管性能。实验结果表明，腐蚀铝槽芯的毛细压力始终高于未腐蚀铝槽芯。然而，应注意控制摩尔浓度和反应时间，以便获得最佳的毛细管性能。在本研究中，最佳腐蚀参数为1.25mol/L氢氧化钠腐蚀10min(记为N1.25-10)，由此得到的最佳毛细管性能参数(Delta P-Cap.K)为8.97+/-0，38×10(-7)N，与未腐蚀的芯材的3.51+/-0.1×10(-7)N相比，提高了155%。在此基础上，提出了一种新的基于芯棒红外上升速率实验的热管毛细换热极限预测方法。N1.25-10样品对应的热管毛细极限(Q(C)，max)达到最大值9.00W+/-4.25%，远远超过未腐蚀芯材的3.52W+/-1.5%。其强化机理与腐蚀后铝表面的微观粗大结构和亲水性提高有关。研究表明，碱腐蚀处理是提高槽型铝芯毛细性能和槽型铝热管毛细换热极限的一种简便有效的方法。(C)2016 Elsevier Inc.保留所有权利。
This paper presents an alkaline corrosion treatment for axially grooved aluminium wicks, which significantly enhances the capillary performance of these wicks and increases the applicability of axially grooved aluminium heat pipes in space or in a horizontal direction. The effect of corrosion parameters (molar concentration and reaction time) on the capillary performance was investigated. An IR camera was used to build a capillary rate-of-rise test apparatus to measure the capillary performance of corroded wicks. Experimental results indicate that the corroded-aluminium grooved wicks always present higher capillary pressures than non-corroded ones. However, care should be taken to control the molar concentration and reaction time such that the best capillary performance can be achieved. In this study, the optimal corrosion parameters were found to be 1.25 mol/L NaOH for 10 min (noted as N1.25-10), which resulted in the best capillary performance parameter (Delta P-cap.K) of 8.97 +/- 0,38 x 10(-7) N. This finding demonstrated an enhancement of 155% compared with the value of 3.51 +/- 0.1 x 10(-7) N for the non corroded wicks. Furthermore, a novel prediction method was proposed to calculate.the capillary heat transfer limit of heat pipes based on IR rate-of-rise tests on wicks. The calculated corresponding heat pipe capillary limit (Q(C), max) of the sample N1.25-10 reached the maximum value of 9.00 W +/- 4.25%, far exceeding the value of 3.52 W +/- 1.5% for the non-corroded wicks. The underlying mechanism of the enhancement is associated with the micro-coarse-structured morphology and improved hydrophilicity of the corroded aluminium surface. This study demonstrates that alkaline corrosion treatment is an easy and effective way to improve the capillary performance of grooved aluminium wicks and the capillary heat transfer limit of grooved aluminium heat pipes. (C) 2016 Elsevier Inc. All rights reserved.