- 學位論文
微熱管V型溝槽開口夾角對熱性能影響之研究
The Effect of Angle of V-Shaped Channels on the Heat Flux in a Micro Heat Pipe
摘要
本文主要是利用圓柱座標系統修正Cotter最大熱傳量的預測模型，在微熱管中針對單一V型溝槽，分析汽體流動對液體流動的影響，解得溝槽內液體流動速度，以得到單一溝槽內的體積流率。藉由體積流率定義無因次液體流動形狀因子 ，使Cotter最大熱傳量的預測模型加入液-氣接觸面的摩擦影響。 再藉由此方程式，導入溝槽開口夾角角度對圓柱形熱管的溝槽數及截面積大小的影響，進而分析求得最佳溝槽開口夾角，在2ψ=26度，溝槽數為30個時，令熱管獲得最佳熱傳輸送量。結果也顯示出最大熱傳量受到溝槽開口夾角大小的影響大於接觸角α。
並列摘要
The present study modifies Cotter’s model for predicting the maximum heat transport capacity and discusses the performance of a single 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 single 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. The equation shows the effect of channel angle to solve the channel number of cylinder heat pipe and cross-sectional area. The heat pipe could get the optimum channel angle as 2ψ= , channel number =30. It shows that the max heat transfer flux effected by channel angle is bigger than the effect by contact angleα.