Growth of a Vapor‐Filled Cavity near a Heating Surface and Some Related Questions
Growth of a Vapor‐Filled Cavity near a Heating Surface and Some Related Questions
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加热表面附近充满蒸汽的空腔的生长及一些相关问题
DOI：
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发表时间：
1961
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影响因子：
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通讯作者：
K. Forster
中科院分区：
文献类型：
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作者：
K. Forster
汽泡在浸入液体中的加热元件上的生长被视为边界上有蒸发的热传导问题，液体在远离加热表面处处于饱和温度或过冷，但在靠近加热表面处过热。结果表明，与实验一致，在饱和温度下的液体中，半径首先以t½（t是时间）的形式增长，当t → ∞时，半径以t¼的形式增长;对于过冷液体，半径作为时间的函数，以H的无穷级数给出，H后来被确定为热边界层的厚度。本文导出了沸腾液体边界层厚度、空泡溃灭前最大半径和过冷度与过冷度的关系式，并与实验进行了比较。对于大的过冷度，边界层厚度约为最大半径的一半（或更小）。关于沸腾液体传热机理的物理考虑…
The growth of a vapor bubble on a heating element immersed in a liquid which is at saturation temperature or subcooled far from the heating surface but which is superheated near the heating surface, is treated as a problem of heat conduction with evaporation on a boundary. The results show, in agreement with experiment, that in a liquid at saturation temperature the radius grows as t½ at first (t is time) and as t¼ for t → ∞; for a subcooled liquid the radius as a function of time is given as an infinite series in terms of a quantity H, later identified with the thickness of the thermal boundary layer. Several relations between boundary layer thickness in a boiling liquid, maximum radius attained by the cavity before collapse and superheat and subcooling are derived and compared with experiment. For large subcooling the boundary layer thickness is shown to be about one‐half (or less) the size of the maximum radius. Physical considerations concerning the mechanism of heat transmission to a boiling liquid l...