对矩形毛细微槽中液膜在横截面方向上的换热特性进行了研究。计算结果表明,当弯月面与槽底接触时,不仅在微槽的侧壁面上存在两个蒸发薄液膜区,在槽底还形成了两个蒸发薄液膜区;随着槽底热负荷的增大,薄液膜区域热流密度的峰值随之升高;固液接触角增大,薄液膜区域的热流密度峰值增大;薄液膜区域的高强度蒸发换热是矩形毛细微槽高强度换热的主要原因,占总换热量的80%以上;固液界面接触角对薄液膜换热的影响很大。
The cross sectional heat transfer characteristics in rectangular microgrooves were theoretically analyzed.The calculation result shows that there are two additional evaporating thin film zones on the bottom wall of the groove besides the two evaporating thin film zones on the side walls;the peak value of the heat flux in the evaporating thin film zone rises when the heat load under the microgroove increases or the contact angle between the wall and the liquid increases;the intensive evaporation in the thin film zone directly contributes to efficient heat transfer of the microgroove;the heat exchange capacity of the thin film decreases when the contact angle increases.
参考文献
| [1] | A.J. Jiao;H.B. Ma;J.K. Critser .Evaporation heat transfer characteristics of a grooved heat pipe with micro-trapezoidal grooves[J].International Journal of Heat and Mass Transfer,2007(15/16):2905-2911. |
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