本研究是利用外徑6mm、內徑3 mm 之玻璃管製作的9 個折彎 數、總長1980mm 之震盪式熱管。為了使震盪式熱管達到循環狀態， 本實驗在蒸發端採用單邊加熱及雙邊加熱的方式進行實驗，並使用水 冷系統為冷凝器將溫度控制在25°C。在兩種不同的加熱方式下、及 不同輸入功率(20W、60W、100W、140W)下，計算出熱阻值進行比 較。並利用數位攝影機拍攝影片，觀測乙醇在震盪式熱管中流動的情 形。 觀察實驗結果可以發現，當加熱瓦數到達100W 時，震盪式熱管 開始出現循環流，雙邊加熱在循環流中會出現局部的逆流，甚至是發 生震盪進而停止循環的情況，而單邊加熱可以在較低的輸入功率下產 生穩定的單方向循環流，使得熱阻值降低。 This research utilized 6 mm outer diameter and 3 mm inner diameter glass tubes to manufacture 9 turns Closed-Loop Pulsating Heat Pipe (CLPHP) with a total length of 1980mm. For achieving the loop circulation, heaters were installed unilaterally and bilaterally in the evaporator respectively, and a water cooling system kept at 25°C was used as the condenser. The experiment was conducted under both heating methods to compare the thermal resistance at an input power of 20W, 60W, 100W and 140W. Through a digital video camera, the visualization experiment was carried out to observe the ethanol fluid flow in the PHP. From the observation, when the input power is greater than 100W, circulation in the working fluid occurs. Randomness direction of circulation and local oscillation can be found in the bilateral heating. Unilateral heating may allow the consistent direction circulation happened at lower input power to perform lower thermal resistance.
