本文關(guān)鍵詞：振蕩熱管內(nèi)兩相流界面形態(tài)數(shù)值模擬研究　出處：《南昌大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 振蕩熱管 VOF模型 界面追蹤法 兩相流界面

【摘要】：作為一種新型高效的傳熱元件,振蕩熱管以其結(jié)構(gòu)簡單、傳熱性能優(yōu)良、成本低廉、適應(yīng)性強等優(yōu)點,受到了國內(nèi)外學(xué)者極大的關(guān)注,在電子元件散熱、空氣調(diào)節(jié)、余熱回收等領(lǐng)域得到了廣泛應(yīng)用,并具有極大的開發(fā)潛力。振蕩熱管工作時,管內(nèi)壓力溫度波動極為復(fù)雜,促使管內(nèi)表現(xiàn)出復(fù)雜的兩相流動,流型的形成及轉(zhuǎn)變在很大程度上影響著振蕩熱管的工作性能,所以對管內(nèi)兩相流界面形態(tài)的研究具有重要意義。毛細管作為振蕩熱管的基本元件,采用毛細管模型對振蕩熱管內(nèi)兩相流動進行研究是一種切實可行且新穎獨特的途徑。針對柱塞流、氣泡脈動及其變形破裂等振蕩熱管中非常普遍的流型,基于毛細管幾何模型,耦合VOF模型和CSF表面張力模型,采用ANSYS FLUENT14.0求解器進行計算分析。首先借助毛細T形管結(jié)構(gòu)產(chǎn)生穩(wěn)定柱塞流,探究T形管內(nèi)柱塞流形成機理,得到柱塞長度與支管半徑的關(guān)系,為管內(nèi)柱塞流動深入研究提供參考。隨后對毛細管內(nèi)氣泡運動變形進行模擬,通過與其他學(xué)者的實驗結(jié)果及LBM模擬結(jié)果對比,一致性較好,模型準確性得到驗證。研究不同Re數(shù)、We數(shù)、Ca數(shù)情況下毛細管內(nèi)氣泡的變形破裂規(guī)律,以及脈動壓力驅(qū)動下的振蕩變形規(guī)律。在毛細管內(nèi)氣泡破裂臨界毛細值會隨氣泡直徑增加而增加,壓力脈動導(dǎo)致流體流動脈動以及界面波加劇,致使流動紊亂程度增加。隨著振蕩熱管管徑的微型化,管內(nèi)多個獨立氣液界面的相互作用在很大程度上影響著界面的運動,引入界面追蹤法(Front-Tracking Method,FTM),借助其精確追蹤界面的優(yōu)點,運用MATLAB軟件計算處理,以管內(nèi)兩個液滴自由下落為例,初步探索了管內(nèi)多個氣液界面間的耦合作用。數(shù)值分析不同Re數(shù)、Eo數(shù)和液滴初始中心距情況下液滴的運動變形情況。在初始中心距較小(L/D=2)時,液滴在下落過程中變形是不對稱的,并且會相互排斥,在Re數(shù)較大和Eo數(shù)較大時,這種現(xiàn)象更加明顯;而初始中心距較大的液滴運動特性主要由Re數(shù)和Eo數(shù)決定。這些研究為FTM方法在振蕩熱管兩相流研究上的應(yīng)用提供參考。
[Abstract]:As a new type of high efficient heat transfer component, oscillating heat pipe with its simple structure, high heat transfer performance, low cost, strong adaptability etc, by domestic and foreign scholars of great concern, in the air conditioning cooling, electronic components, field of heat recovery has been widely used, and has great development potential. The oscillation the heat pipe, pipe pressure temperature fluctuation is very complex, the tube exhibits complex two-phase flow, formation and change of flow pattern affects the working performance of an oscillating heat pipe to a great extent, so the research on the interface morphology of two-phase flow in pipe is of great significance. As the basic element of capillary oscillating heat pipe the model of capillary flow in oscillating heat pipe flow is a feasible and unique way to research on plunger flow, bubble deformation and rupture of oscillating heat pipe is very common in the The flow pattern, capillary geometry model based on coupling model of VOF and CSF surface tension model, using ANSYS solver of FLUENT14.0 were calculated and analyzed. First by capillary T tube structure to generate stable slug flow, exploring the T - shaped pipe plunger flow mechanism, piston length and branch pipe radius relationship, provide reference for further study on the tube in the plunger flow. Then the bubble movement in capillary deformation is simulated by experimental results with other scholars and the LBM simulation results have good consistency, accuracy of the model was verified. The study of different Re number, We number, Ca number of bubbles in the capillary deformation under the condition of deformation and rupture of oscillation driven by fluctuating pressure the critical rupture value. Capillary increases with the increase of bubble diameter bubbles in the capillary, resulting in fluid flow pulsation and pressure pulsation of interface wave intensified, resulting in the flow disturbance process The degree of increase. With the miniaturization of the oscillating heat pipe, the interaction of multiple independent gas-liquid interface tube affects the interface movement to a great extent, the introduction of the interface tracking method (Front-Tracking Method FTM), with its advantages of accurate tracking interface, calculating and processing using MATLAB software, the tube two drops free fall as an example, a preliminary exploration of the coupling between a gas-liquid interface inside the tube. The numerical analysis of different Re number, Eo number and the initial droplet center distance of droplet motion and deformation. In the initial center distance is smaller (L/D=2), the droplet in the falling process of deformation is asymmetrical, and will repel each other, in a large number of Re and the Eo number is large, this phenomenon is more obvious; and the movement characteristics of liquid droplet from the larger initial center is mainly composed of Re and Eo number decision. These studies for the FTM method in the application of oscillating heat pipe two-phase flow on. Test.

【學(xué)位授予單位】：南昌大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TK172.4

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