SURFACE-ROUGHNESS AND ITS EFFECTS ON THE HEAT-TRANSFER MECHANISM IN SPRAY COOLING
SURFACE-ROUGHNESS AND ITS EFFECTS ON THE HEAT-TRANSFER MECHANISM IN SPRAY COOLING
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DOI：
10.1115/1.2911248
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发表时间：
1992-02-01
影响因子：
--
通讯作者：
MAHEFKEY, ET
中科院分区：
文献类型：
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作者：
PAIS, MR;CHOW, LC;MAHEFKEY, ET
在加热表面的喷雾冷却中，表面纹理的变化影响流场，改变最大液膜厚度、气泡直径、蒸汽截留、气泡离开特性和传热能力。提出了一种新的表面织构的确定和命名方法，并研究了表面粗糙度对喷雾冷却流场中蒸发/形核的影响。应用一维傅立叶分析来实验性地确定用砂纸抛光的表面的表面轮廓，所述砂纸覆盖0.3至22 μ m之间的粒度谱。传热测量液体流量在1至5升/小时和空气流量在0.1至0.4升/秒。在非常低的过热度的0.3 μ m的表面获得1200 W/cm 2的最大热通量。
In the spray cooling of a heated surface, variations in the surface texture influence the flow field, altering the maximum liquid film thickness, the bubble diameter, vapor entrapment, bubble departure characteristics, and the ability to transfer heat. A new method for determining and designating the surface texture is proposed, and the effects of surface roughness on evaporation/nucleation in the spray cooling flow field studied. A one-dimensional Fourier analysis is applied to determine experimentally the surface profile of a surface polished with emery paper covering a spectrum of grit sizes between 0.3 to 22-mu-m. Heat transfer measurements for liquid flow rates between 1 to 5 l/h and air flow rates between 0.1 to 0.4 l/s are presented. Maximum heat fluxes of 1200 W/cm2 for the 0.3-mu-m surface at very low superheats were obtained.