本文選題：振蕩熱管 + 相變傳熱傳質(zhì)　； 參考：《南昌大學(xué)》2016年碩士論文

【摘要】：在上個(gè)世紀(jì)90年代,Akachi發(fā)明了一種傳熱效率極高的熱管,命名為振蕩熱管。振蕩熱管有著熱超導(dǎo)體的美稱,其顯著的傳熱效率甚至比任意一種金屬還要高,因而備受科研工作者的青睞。然而到目前為止,大多數(shù)研究仍停留在現(xiàn)象觀測(cè)上,關(guān)于振蕩熱管的運(yùn)行機(jī)理及流動(dòng)特性還沒有完整的理論認(rèn)識(shí),所以本文嘗試通過(guò)數(shù)值模擬研究尋找答案。振蕩熱管的研究屬于典型的氣液兩相流類型,該類研究的關(guān)鍵在于準(zhǔn)確的捕捉到氣液相界面。本文嘗試以VOF方法捕捉界面,結(jié)合相變傳熱理論處理氣液之間傳熱傳質(zhì),選用連續(xù)表面力(CSF)模型計(jì)算表面張力,引用Kistler提出的動(dòng)態(tài)接觸角模型計(jì)算管內(nèi)工質(zhì)的動(dòng)態(tài)接觸角�；诖�,建立了較為準(zhǔn)確處理振蕩熱管內(nèi)氣液相變的二維數(shù)學(xué)模型,并在Fluent平臺(tái)上對(duì)單環(huán)閉式振蕩熱管進(jìn)行了數(shù)值模擬,直觀研究分析了振蕩熱管中氣液相變傳熱傳質(zhì)。振蕩熱管模擬過(guò)程分為兩個(gè)階段:初始化階段和加熱運(yùn)行階段。針對(duì)數(shù)值模擬中振蕩熱管初始化的特殊性,詳細(xì)描述了其初始化過(guò)程,并比較了三種真空度對(duì)初始化的影響;研究了加熱以后氣泡的生長(zhǎng)、運(yùn)動(dòng)狀況以及分布情況;分析了氣泡變化與傳熱之間的關(guān)系;關(guān)注了液相工質(zhì)內(nèi)流動(dòng)狀況;分析了動(dòng)態(tài)接觸角模型對(duì)振蕩熱管模擬的重要性。最后著重以氣泡/塞為研究對(duì)象,分析氣泡運(yùn)動(dòng)特性、工質(zhì)流動(dòng)特性以及振蕩熱管振蕩特性,針對(duì)振蕩熱管的運(yùn)行特征進(jìn)行分析研究,更好的了解和認(rèn)識(shí)振蕩熱管運(yùn)行機(jī)理。
[Abstract]:In the 1990 s, Akachi invented a highly efficient heat pipe named oscillating heat pipe. Oscillating heat pipe has the reputation of thermal superconductor, its remarkable heat transfer efficiency is even higher than any metal, so it is favored by researchers. However, up to now, most of the studies are still focused on the observation of phenomena, and there is no complete theoretical understanding of the operating mechanism and flow characteristics of the oscillatory heat pipe, so this paper attempts to find out the answer by numerical simulation. The research of oscillatory heat pipe belongs to the typical gas-liquid two-phase flow. The key of this kind of research is to capture the gas-liquid interface accurately. In this paper, the interface is captured by VOF method, and the heat and mass transfer between gas and liquid is treated with the theory of phase change heat transfer. The continuous surface force model is used to calculate the surface tension, and the dynamic contact angle model proposed by Kistler is used to calculate the dynamic contact angle of the working fluid in the tube. Based on this, a 2-D mathematical model for dealing with the gas-liquid phase change in oscillatory heat pipe is established, and the numerical simulation of single-loop closed oscillating heat pipe is carried out on the Fluent platform. The heat and mass transfer of gas-liquid phase variation in oscillatory heat pipe is studied intuitively. The simulation process of oscillating heat pipe is divided into two stages: initialization stage and heating operation stage. Aiming at the particularity of oscillating heat pipe initialization in numerical simulation, the initialization process is described in detail, and the effects of three kinds of vacuum on initialization are compared, and the growth, motion and distribution of bubbles after heating are studied. The relationship between bubble change and heat transfer is analyzed, the flow situation in liquid phase is concerned, and the importance of dynamic contact angle model to the simulation of oscillating heat pipe is analyzed. Finally, the bubble / plug is taken as the research object to analyze the characteristics of bubble motion, working fluid flow and oscillatory heat pipe oscillation. The operating characteristics of oscillating heat pipe are analyzed and studied to better understand and understand the operating mechanism of oscillating heat pipe.
【學(xué)位授予單位】：南昌大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：TK124

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