功能涂层分割表面降液膜流动过程的CFD模拟

发布时间：2018-01-13 22:29

本文关键词：功能涂层分割表面降液膜流动过程的CFD模拟　出处：《工程热物理学报》2016年01期 　论文类型：期刊论文

【摘要】：建立二维功能涂层分割表面流动模型,利用CFD方法研究了不同喷淋密度下功能涂层表面的降液膜流动过程。当喷淋密度小于最小喷淋密度时,壁面出现局部干壁并伴随液膜积聚和重新铺展现象产生。当喷淋密度大于最小喷淋密度时,含涂层壁面与不含涂层壁面对液膜的流动形态几乎无影响;但流动稳定之后,液膜内部的掺混加剧,可显著减薄传热边界层的厚度,对吸收器的传热传质性能起到影响。模拟结果与实验结果吻合良好,具有显著的实际意义。
[Abstract]:A two-dimensional flow model of functional coating was established. The flow process of falling liquid film on the surface of functional coating under different spray densities was studied by using CFD method, when the spray density was less than the minimum spray density. When the spray density is greater than the minimum spray density, the flow pattern of the coated wall and the uncoated wall on the liquid film is almost unaffected. However, after the steady flow, the mixing inside the liquid film is intensified, the thickness of the heat transfer boundary layer can be significantly reduced, and the heat and mass transfer performance of the absorber is affected. The simulation results are in good agreement with the experimental results. It has significant practical significance.
【作者单位】：大连理工大学化学工程研究所;
【基金】：国家自然科学基金(No.51176018)
【分类号】：TK124
【正文快照】： 0引言第二类吸收式热泵又称为吸收式热变换器(Ab-sorption Heat,简称AHT),在回收工业废热的同时可以提高低品位热能,此过程中仅消耗少量电能,因此近几年来得到了越来越多国家的重视W。吸收器是吸收式热变换器的核心设备,其传热面积占整个机组面积的60%以上,因此其内部的液膜

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