閉迴路型脈動式熱管之研製與性能測試（上）

Fabrication and Test of Closed-loop Pulsating Heat Pipe (1)

黃博全(Po-Chuan Huang) ； 陳理定(Li-Ting Chen) ； 涂堂烘(Tang-Hung Tu)

《冷凍與空調》 42期 (2006/12) Pp. 57-61

https://doi.org/10.7087/JRACT.200612.0057

摘要

脈動式熱管(PHP)是一種新型態兩相流熱傳裝置，其結合了潛熱與顯熱的高熱傳性質，加上構造簡單，並擁有可彎曲的特性，是一項相當具有前景的熱傳裝置。依目前文獻可知，影響脈動式熱管效能參數眾多，本文旨在嘗試利用外徑1/8英吋，內徑2mm之紅銅管以及外徑3mm，內徑2mm之玻璃管作為閉迴路型脈動式熱管之管路，以水作為工作流體填充於管內，藉此架構進行(1)流場可視化觀測；(2)脈動式熱管熱傳性能分析及(3)脈動式熱管與傳統毛細式熱管性能評比。實驗結果顯示(1)管內流場的型態會隨著熱負荷的多寡而改變，流場可分為震盪期、過渡期與穩定期；(2)系統總熱阻會隨著熱負荷的增加而遞減，填充比率為30%時，PHP熱傳效率最佳，而依照擺設傾斜角度的不同，影響脈動式熱管運作與效能之主要實驗參數也隨之改變，此結果可提供設計者製作閉迴路型脈動式熱管的參考；(3)依據脈動式熱管與熱管性能評比實驗模組以相同的吸熱與散熱表面積於垂直與水平的擺設方位，評比脈動式熱管與熱管之性能，實驗結果為脈動式於垂直擺設條件下如能進入至穩定期，其效能可優於熱管。

關鍵字

閉迴路型脈動式熱管 ； 兩相流 ； 毛細管 ； 震盪期

並列摘要

Pulsating heat pipe (PHP) is a new two-phase-flow heat transfer device, which can transfer heat very efficiently in both sensible and latent forms. Due to the simple structure and the bent characteristics, PHP is a prosperous heat transfer machine. The purpose of this thesis is to build several closed-loop PHP made by copper tube (outer diameter 1/8”, inner diameter 2mm) or glass tube (outer diameter 3mm, inner diameter 2mm), which is partially filled with a working fluid such as water. Based on the above PHP, the experiments were conducted as follows: (1) to observe visualization of flow pattern inside the PHP tube, (2) to measure the thermal transport performance of PHP, and (3) to compare the performance of PHP and heat pipe (HP). The experimental results show that (1) the type of flow pattern inside the PHP tube depends on the input heat loading. It was found that the flow pattern changes from the oscillating to transiting and then to stable period with increasing input heat loading; (2) the thermal resistance of PHP decreases with increasing heat loading. In addition, when the fill ratio is equal to 30%, it reaches the best heat transfer efficiency condition. When the angle of inclination changes, main parameter that effect efficiency of PHP, will different; and (3) in case of both heat loading and area of heat transfer surface are equal, PHP may have the better heat transfer efficiency than HP at the vertical operating condition.

並列關鍵字

Closed-loop pulsating heat pipe ； The two-phase flow ； Capillary ； Oscillating period