本文選題：超薄微熱管　切入點(diǎn)：復(fù)合吸液芯　出處：《華南理工大學(xué)》2015年碩士論文　論文類(lèi)型：學(xué)位論文

【摘要】：隨著微電子、光電子領(lǐng)域不斷朝著高性能化和高集成度的方向發(fā)展,電子芯片的功耗日益增加,特別是在電子設(shè)備整體結(jié)構(gòu)輕薄化、緊湊化的發(fā)展趨勢(shì)下,電子元器件的散熱問(wèn)題日益凸顯。微熱管作為一種高效相變傳熱元件,已被廣泛應(yīng)用于解決眾多領(lǐng)域的熱問(wèn)題。但要在結(jié)構(gòu)緊湊的電子設(shè)備上利用微熱管散熱,,必須開(kāi)發(fā)出厚度更薄、體積更小且傳熱性能良好的超薄微熱管。吸液芯結(jié)構(gòu)是影響微熱管傳熱性能最關(guān)鍵的因素之一,本文探究了三種適用于超薄微熱管的復(fù)合吸液芯結(jié)構(gòu)及其成形方法,包括了單弓形銅粉復(fù)合溝槽吸液芯、雙弓形銅粉復(fù)合溝槽吸液芯和絲網(wǎng)復(fù)合溝槽吸液芯。制定了復(fù)合吸液芯超薄微熱管的制造工藝路線(xiàn),并確定了各工藝參數(shù)。本文實(shí)驗(yàn)制作了三種復(fù)合吸液芯結(jié)構(gòu)的超薄微熱管樣品;利用掃描電子顯微鏡對(duì)樣品的橫截面、縱切面進(jìn)行觀(guān)測(cè),觀(guān)察復(fù)合吸液芯的復(fù)合燒結(jié)狀態(tài)、擠壓狀態(tài)以及撕裂狀態(tài),探索壓扁工藝對(duì)吸液芯結(jié)構(gòu)最終成形所造成的影響,并結(jié)合傳熱性能實(shí)驗(yàn)結(jié)果分析吸液芯成形狀態(tài)對(duì)傳熱性能的影響。本文基于微熱管的傳熱極限理論推導(dǎo)各主要傳熱極限的計(jì)算方法,并通過(guò)代入復(fù)合吸液芯的結(jié)構(gòu)參數(shù)以及工質(zhì)的物性參數(shù)計(jì)算出超薄微熱管主要傳熱極限的具體數(shù)值。發(fā)現(xiàn)三種復(fù)合吸液芯結(jié)構(gòu)的超薄微熱管主要受毛細(xì)極限的限制,55°C工作溫度下,單弓形復(fù)合吸液芯結(jié)構(gòu)樣品的傳熱極限為12.5W,雙弓形結(jié)構(gòu)為15.4W,絲網(wǎng)結(jié)構(gòu)為19.4W。本文搭建了實(shí)驗(yàn)平臺(tái),并對(duì)不同充液率下的三種復(fù)合吸液芯結(jié)構(gòu)超薄微熱管進(jìn)行穩(wěn)態(tài)性能和動(dòng)態(tài)性能測(cè)試。先通過(guò)縱向?qū)Ρ?探索超薄微熱管的最佳充液率;再橫向?qū)Ρ炔煌盒窘Y(jié)構(gòu)樣品的傳熱性能,然后對(duì)比超薄微熱管分別在正常工作下和燒干狀態(tài)下的啟動(dòng)性能。通過(guò)紅外熱成像的手段探究超薄微熱管的均溫性能和吸液芯的毛細(xì)性能。實(shí)驗(yàn)表明:單弓形銅粉復(fù)合與雙弓形銅粉復(fù)合結(jié)構(gòu)的最佳充液率均為70%,絲網(wǎng)復(fù)合結(jié)構(gòu)為80%,三種結(jié)構(gòu)的傳熱極限功率分別為12 W、13 W和14 W,蒸發(fā)熱阻呈現(xiàn)先減少后增加的趨勢(shì),而冷凝熱阻相對(duì)穩(wěn)定,基本維持在0.2 K/W以下。加熱功率較低時(shí),超薄微熱管從啟動(dòng)到其穩(wěn)定的時(shí)間大概為100秒;加熱功率較高時(shí),從啟動(dòng)到其溫度出現(xiàn)燒干的時(shí)間大概為80秒。超薄微熱管具有良好的均溫性能,雙弓形復(fù)合吸液芯的毛細(xì)性能最佳,絲網(wǎng)結(jié)構(gòu)毛細(xì)性能最差。
[Abstract]:With the development of microelectronics and optoelectronics, the power consumption of electronic chips is increasing day by day, especially in the trend of thinning and compactness of the whole structure of electronic devices. The heat dissipation of electronic components is becoming more and more serious. As a kind of high efficiency phase change heat transfer element, microheat pipe, Has been widely used to solve thermal problems in many fields. But in order to use micro-heat pipes to dissipate heat on compact electronic devices, a thinner thickness must be developed. The structure of liquid absorbing core is one of the most important factors affecting the heat transfer performance of micro heat pipe. In this paper, three kinds of composite absorbent core structures and their forming methods suitable for ultra-thin micro heat pipe are studied. Including single bow copper powder composite groove suction core, double bow copper powder composite groove suction core and wire mesh composite groove suction core. In this paper, three kinds of ultra-thin micro-heat pipe samples with composite absorbent core structure are experimentally made, the cross section and longitudinal section of the sample are observed by scanning electron microscope, and the composite sintering state of the composite absorbent core is observed. To explore the effect of flattening process on the final forming of sucking core structure under extrusion and tearing conditions. Combined with the experimental results of heat transfer performance, the influence of the forming state of liquid absorbing core on the heat transfer performance is analyzed. Based on the heat transfer limit theory of micro-heat pipe, the calculation methods of each main heat transfer limit are deduced. The main heat transfer limit of ultra-thin micro-heat pipe is calculated by adding the structure parameters of composite absorbent core and the physical property parameter of working fluid. It is found that three kinds of ultra-thin micro-heat pipe with composite liquid absorbing core structure are mainly limited by capillary limit. At the operating temperature of 55 擄C, The heat transfer limit of the single arch composite absorbent core structure is 12.5 W, the double arch structure is 15.4W, and the wire mesh structure is 19.4W. the experimental platform is set up in this paper. The steady-state and dynamic properties of three kinds of ultra-thin micro-heat pipes with different liquid-absorbing core structures were tested. Firstly, the optimum liquid-filled rate of ultra-thin micro-heat pipes was explored by longitudinal comparison. Then the heat transfer performance of different absorbent core structure samples is compared laterally. Then, the starting performance of ultra-thin micro-heat pipe under normal operation and burning dry state was compared. The average temperature performance of ultra-thin micro-heat pipe and the capillary property of absorbent core were investigated by infrared thermal imaging. The results showed that: single bow copper. The optimum liquid-filled ratio of powder composite structure and double bow copper powder composite structure is both 70 and 80, and the heat transfer limit power of the three structures is 12 W / 13 W and 14 W respectively. The evaporation thermal resistance decreases first and then increases. However, the condensation thermal resistance is relatively stable, basically below 0.2 K / W. when the heating power is low, the time from starting to stabilizing the superthin micro-heat pipe is about 100 seconds, and when the heating power is high, The time from starting to drying at the temperature is about 80 seconds. The ultra-thin micro-heat pipe has good homogeneous temperature performance, the capillary property of double-arch composite absorbent core is the best, and the capillary property of wire mesh structure is the worst.
【學(xué)位授予單位】：華南理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：TN605

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