A Study of Liquid-Vapor Interface Interaction in a Micro Heat Pipe.

• Main Authors: Che-Hsing Lin, 林哲興
• Other Authors: Cheng-Hsing Hsu
• Format: Others
• Language: zh-TW
• Published: 2004
• Online Access: http://ndltd.ncl.edu.tw/handle/pf9399

碩士 === 中原大學 === 機械工程研究所 === 92 === The present study modifies Cotter’s model for predicting the maximum heat transport capacity and discusses the performance of a <a href="http://www.ntsearch.com/search.php?q=single&v=56">single</a> V-shaped microgroove of the Micro heat pipe. A cylindrical coordinate system is used to analyze the correlated between the liquid flow velocity and vapor flow direction, which will affect the behavior of liquid surface and liquid flow velocity, and to obtain the relating volumetric flow-rate in the <a href="http://www.ntsearch.com/search.php?q=single&v=56">single</a> microgroove. Then, in order to include the frictional effect of the liquid-vapor interaction into the Cotter’s model, a dimensionless liquid flow shape factor, , which is defined by the volumetric flow-rate, is introduced to predict the maximum heat transport capacity. Introduce a dimensionless number , represent the strength of the friction effect of the vapor-liquid interface flow, into the correlated relation between vapor flow and liquid flow in the analytical process. The results indicated that as value increases, the liquid flow influenced by the vapor flow also increases, which is obviously resulting the reducing values of . The predicted maximum heat transport capacity agrees well with Babin’s experimental of a copper-water micro heat pipe data for the case of and <a href="http://www.ntsearch.com/search.php?q=contact&v=56">contact</a> angle . In a triangular micro heat pipe, the results indicated that maximum heat transport capacity and increases with increasing <a href="http://www.ntsearch.com/search.php?q=contact&v=56">contact</a> angle .