【作者】 金鑫；

【导师】 黄晓明；

【作者基本信息】 华中科技大学 ， 工程热物理， 2014， 硕士

【摘要】 近年来，随着电子设备的小型化以及功耗增加，对热控技术的要求越来越高。由于两相毛细热传输装置(如环路热管等)在热控方面具有无运动部件、效率高、等温性好以及热阻低等优点,使其成为国内外诸多研究者的研究热点。但是一些关键问题严重限制了这类装置的实际应用(例如远低于理论极限情况下系统运行失效等)，其原因与人们对起着关键作用的毛细弯液面蒸发换热机理的欠缺了解有很大关系。本文首先从增广杨拉普拉斯方程出发，通过蒸发弯月面的连续性方程、动量以及能量平衡方程等，建立蒸发弯月面的热质传输模型。在此模型基础上，考察热边界性条件、几何条件以及热物性参数等对蒸发弯月面蒸发换热的影响。研究结果表明处于蒸发状态下的弯月面与静态下的弯月面有很大的不同；蒸发弯月面中微观薄膜区的蒸发换热量在整个弯月面中占有很大比例，而这一区域的蒸发换热往往容易被忽略。并通过蒸发弯月面的传热传质研究得到了热负荷变化下的表观接触角以及有效毛细半径等重要参数。基于蒸发弯月面的传热传质的研究结果，建立毛细相变回路的蒸发换热模型以及回路压损模型，于是可以得到毛细相变回路的毛细传热极限。采用数值的方法分析毛细相变回路的毛细传热极限的影响因素。并对比考虑了加入微观薄膜区蒸发换热的毛细传热极限和通常被忽略情况下的毛细差异；也讨论了与Cotter理论将弯月面静态处理的毛细极限的差异。本文的研究对于提高毛细相变回路的传热能力有着重要作用，并且对于毛细相变回路的稳定机理也有一定的作用，对于今后设计大传输能力的毛细相变回路具有较好的指导意义。更多还原

【Abstract】 In recent years, with the miniaturization of electronic devices and power increasing,demands for thermal control technology are highly rising. As the two-phase capillary heattransfer devices(such as loop heat pipe, etc)have the advantages of no moving parts, highefficiency, better isothermal and low thermal resistance in thermal control, they are hottopics for many domestic and foreign researchers. But some key issues severely limit thepractical application of such a device(such as failure of the system far below the theoreticallimit), it has a great relationship with people lack of understanding of heat and masstransfer mechanism in meniscus evaporation which plays a key role in evaporator wick.Firstly, from the augmented Young-Laplace equation, a evaporation meniscus heatand mass transfer model is established, through evaporation meniscuscontinuity,momentum and energy equation. Under this model, the impact of thermalboundary conditions, geometry and working fluid thermal parameters on evaporationmeniscus is researched. The results show that the meniscus in evaporation and static stateare quite different; evaporation in thin film region takes a large proportion of the entiremeniscus evaporation, while the heat transfer in this region are easily overlooked. Theimportant parameters under thermal load variations, such as the apparent contact angle andthe effective radius, are obtained.Based on the evaporation meniscus research results, heat transfer model and pressureloss model in the two-phase capillary heat and mass transfer devices are established, thenthe capillary limit of the loop is got. Numerical methods are taken to analyze the factorsaffecting the capillary limit. The differences of the capillary limit adding and ignoring thefilm evaporation heat and mass transfer are considered.The cotter capillary limit is alsodiscussed which always thinks meniscus is static.The study plays an important role in improving the capacity of the capillary loop, andalso has certain extent for the stability research of the capillary loop. Due to the study, thedesign of the capillary loop with larger capacity can be better guided.更多还原