本文選題：脈動熱管 + 可視化　； 參考：《華南理工大學》2015年碩士論文

【摘要】：脈動熱管是一種新型高效的熱管,具有制造成本低和傳熱性能好的特點。隨著各種熱管理環(huán)境對散熱要求的提高和脈動熱管本身技術的發(fā)展,脈動熱管具有十分廣闊的應用前景。特別是制造出可穩(wěn)定單向循環(huán)的脈動熱管,將對脈動熱管的性能有極大的提升,進一步拓寬了脈動熱管的應用。本文主要研究脈動熱管單向運行的條件及性能�；诜菍ΨQ的思想,設計了半可視化的脈動熱管觀察單行流的發(fā)生,同時對其溫度變化規(guī)律進行研究,然后對單向運行的脈動熱管的啟動性能和穩(wěn)定運行性能進行研究,并發(fā)現脈動熱管單向運行的外部條件是輸入熱流密度的不對稱,并且在單側加熱的情況下可以獲得最小熱阻。重力決定單行運行的方向,即位于加熱段的工質總有沿著重力反方向運動的趨勢。在對脈動熱管非對稱加熱的溫度變化研究中,發(fā)現脈動熱管運行時存在對立統(tǒng)一的震蕩性和單向性。兩側輸入的熱流密度差異越大,單向性越強,振蕩性越弱;反之,單向性越弱,振蕩性越強。在對脈動熱管單向運行性能的研究中,發(fā)現脈動熱管的啟動性能和穩(wěn)定運行性能隨著功率的增加而增加,但隨著充液率的變化出現相反的變化。充液率越高,啟動性能越好,穩(wěn)定運行性能越差。因此,并不存在一個絕對最優(yōu)的充液率使脈動熱管的性能達到最佳,而是需要根據實際應用環(huán)境進行取舍。本文還發(fā)現對于單向運行的脈動熱管,在高功率低充液率條件下,相變傳熱占主導。同時,本文還發(fā)現了重力使更多的液態(tài)工質聚集在底部,加熱段位置越高,局部充液率就越低,則啟動性能越差,穩(wěn)定運行性能也越差,從而為脈動熱管的反重力應用提供指導。
[Abstract]:Pulsating heat pipe is a new type of heat pipe with low manufacturing cost and good heat transfer performance. With the improvement of heat dissipation requirements in various thermal management environments and the development of pulsating heat pipe technology, pulsating heat pipe has a very broad application prospect. Especially the pulsating heat pipe with stable unidirectional circulation will greatly improve the performance of the pulsating heat pipe and further expand the application of the pulsating heat pipe. This paper mainly studies the condition and performance of pulsating heat pipe in one-way operation. Based on the idea of asymmetry, a semi-visual pulsating heat pipe is designed to observe the occurrence of single flow, and the law of temperature variation is studied. Then, the start-up performance and stable operation performance of unidirectional pulsating heat pipe are studied. It is also found that the external condition of unidirectional operation of pulsating heat pipe is the asymmetry of input heat flux, and the minimum thermal resistance can be obtained under the condition of unilateral heating. Gravity determines the direction of one-line operation, that is, the working fluid in the heating section always moves in the opposite direction of gravity. In the study of the temperature variation of pulsating heat pipe asymmetric heating, it is found that there is a unified opposites and unidirectional characteristics in the operation of pulsating heat pipe. The greater the difference of heat flux between two sides is, the stronger the unidirectional property is and the weaker the oscillation is, whereas the weaker the unidirectional property is, the stronger the oscillation is. In the study of the unidirectional operation performance of pulsating heat pipe, it is found that the start-up performance and stable operation performance of pulsating heat pipe increase with the increase of power, but the change of liquid filling rate is opposite. The higher the liquid filling rate, the better the startup performance and the worse the stable operation performance. Therefore, there is no absolute optimal liquid filling rate to optimize the performance of the pulsating heat pipe, but it is necessary to choose and choose according to the practical application environment. It is also found that for unidirectional pulsating heat pipe, phase change heat transfer is dominant under the condition of high power and low liquid charge rate. At the same time, it is also found that gravity makes more liquid working fluids gather at the bottom, the higher the position of the heating section, the lower the local filling rate, the worse the startup performance and the worse the stable operation performance. It provides guidance for the anti-gravity application of pulsating heat pipe.
【學位授予單位】：華南理工大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TK172.4

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本文編號：1894657