EFFECT OF SURFACE WETTABILITY ON ACTIVE NUCLEATION SITE DENSITY DURING POOL BOILING OF WATER ON A VERTICAL SURFACE
EFFECT OF SURFACE WETTABILITY ON ACTIVE NUCLEATION SITE DENSITY DURING POOL BOILING OF WATER ON A VERTICAL SURFACE
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DOI：
10.1115/1.2910737
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发表时间：
1993-08-01
影响因子：
--
通讯作者：
DHIR, VK
中科院分区：
文献类型：
--
作者：
WANG, CH;DHIR, VK
本文研究了饱和水在1个大气压下的池沸腾。在实验中，使用通过遵循明确定义的程序制备的铜表面。用光学显微镜测定空洞的累积数密度及其形状。该表面具有镜面光洁度并且具有小于0的表面R（a）（中心线平均值）值。妈妈。通过控制表面的氧化程度来改变表面的润湿性。在主表面的实验中，壁面热通量和热流密度是借助嵌入在试验块中的热电偶来确定的。从静态图像中确定了部分和完全发展的核态沸腾中活性核化点的密度、空间分布、局部分布和最近邻距离分布。
Pool boiling of saturated water at 1 atm pressure has been investigated. In the experiments, copper surfaces prepared by following a well-defined procedure were used. The cumulative number density of the cavities and their shapes were determined with an optical microscope. The surface had a mirror finish and had a surface R(a) (centerline average) value of less than 0. 02 mum. The wettability of the surface was changed by controlling the degree of oxidation of the surface. In the experiments with the primary surface, the wall heat flux and superheat were determined with the help of thermocouples embedded in the test block. The density, spatial distribution, local distribution, and nearest-neighbor distance distribution of active nucleation sites in partial and fully developed nucleate boiling were determined from still pictures.