|關鍵字:||冷凝熱傳;次毫米;壓降;矩形流道;FC-72;condensation;sub-millimeter;pressure drop;rectangular channel;FC-72|
This thesis experimentally investigated the characteristics of condensation heat transfer and pressure drop for dielectric fluid FC-72 flowing in horizontal rectangular channels. The rectangular channels have two hydraulic diameters of 1mm and 0.67mm. The effects of the heat flux, mass flux and vapor quality of FC-72 on measured condensation heat transfer and pressure drop were examined in detail. The heat transfer coefficient was shown to be higher at a higher vapor quality, at a higher mass flux and at a higher heat flux. The pressure drop was shown to be higher at a higher vapor quality and a higher mass flux, but the heat flux has no effect on pressure drop. The Akers and Shah correlations did not predict well in this study. For practical design of micro heat exchangers, the empirical correlation was proposed to correlate the present data for the heat transfer coefficient.