【摘要】：具有微納復(fù)合結(jié)構(gòu)的微槽群熱沉是在微槽群熱沉的表面鍍上一層納米涂層而形成的。該結(jié)構(gòu)即具有微尺度結(jié)構(gòu)的特性,又具有納米結(jié)構(gòu)的特性,所以微納復(fù)合結(jié)構(gòu)具有更為特殊的強(qiáng)化換熱特性。對(duì)具有微納復(fù)合結(jié)構(gòu)的微槽群熱沉中的相變換熱進(jìn)行研究,對(duì)發(fā)展微納尺度的相變傳熱理論,具有重要的學(xué)術(shù)價(jià)值;該課題的研究為高熱流密度下的電子元器件的散熱系統(tǒng)的設(shè)計(jì)提供了理論依據(jù),對(duì)促進(jìn)我國(guó)電子產(chǎn)業(yè)的發(fā)展,具有重要的實(shí)際應(yīng)用價(jià)值。本文采用高速攝影儀對(duì)豎直放置的不同微槽群結(jié)構(gòu)的微納復(fù)合結(jié)構(gòu)熱沉表面的汽泡動(dòng)力學(xué)行為進(jìn)行可視化研究。采用劃片的工藝在硼硅玻璃板上劃刻出不同尺寸的矩形微槽,再采用磁控濺射的方法在微槽表面鍍上一層厚度為250nm的鈦納米涂層,形成具有微納復(fù)合結(jié)構(gòu)的微槽群熱沉。實(shí)驗(yàn)液體工質(zhì)選用蒸餾水,采用加熱和溫控系統(tǒng)將蒸餾水溫度控制在飽和溫度,然后通過(guò)陶瓷加熱片對(duì)微納復(fù)合結(jié)構(gòu)熱沉進(jìn)行加熱,使用高速攝影儀觀察拍攝微納復(fù)合結(jié)構(gòu)熱沉中的汽泡動(dòng)力學(xué)行為,采用數(shù)據(jù)采集儀對(duì)微納復(fù)合結(jié)構(gòu)熱沉背部、聚四氟乙烯絕熱件的溫度進(jìn)行采集。對(duì)實(shí)驗(yàn)過(guò)程中拍攝的影像使用高速攝影儀自帶軟件PCC2.3進(jìn)行逐幀回放和保存,并使用MATLAB的圖像邊緣化進(jìn)行進(jìn)一步處理,計(jì)算得到汽泡生長(zhǎng)過(guò)程中各階段的當(dāng)量直徑。本文實(shí)驗(yàn)過(guò)程中將高速攝影儀的拍攝速率設(shè)置為6000幀/秒,每?jī)蓭臅r(shí)間間隔為0.17ms,通過(guò)查數(shù)汽泡周期內(nèi)的圖像幀數(shù),得出汽泡周期和汽泡的等待時(shí)間。根據(jù)實(shí)驗(yàn)研究發(fā)現(xiàn):在相同槽深的微納復(fù)合結(jié)構(gòu)熱沉中,相同熱流密度下,汽泡當(dāng)量直徑、汽泡周期、汽泡等待時(shí)間隨微槽深寬比的增大而減小;在微槽群結(jié)構(gòu)相同的微納復(fù)合結(jié)構(gòu)熱沉中,汽泡破裂時(shí)的當(dāng)量直徑隨熱流密度的增大而減小;相同熱流密度下,與無(wú)納米涂層的微槽群熱沉中的汽泡破裂時(shí)的當(dāng)量直徑和汽泡周期相比,具有相同微槽群結(jié)構(gòu)的微納復(fù)合結(jié)構(gòu)中汽泡破裂時(shí)的當(dāng)量直徑和汽泡周期較小。汽泡周期和汽泡的等待時(shí)間均隨熱流密度的增大而減小,此規(guī)律與微槽尺寸變化及熱沉表面有無(wú)納米涂層無(wú)關(guān)。通過(guò)上述研究結(jié)果表明,與無(wú)納米涂層的微槽群熱沉的微尺度結(jié)構(gòu)變化相比,具有微納復(fù)合結(jié)構(gòu)的微槽群熱沉的微尺度結(jié)構(gòu)變化對(duì)汽泡動(dòng)力學(xué)行為變化的影響更加顯著。
[Abstract]:The micro-groove group heat sink with micro-nano composite structure is formed by coating a layer of nano-coating on the surface of micro-groove group heat sink. The structure has the characteristics of both micro-scale structure and nanostructure, so the micro-nano composite structure has more special heat transfer characteristics. The study of phase change heat transfer in heat sink of microgroove group with micro-nano composite structure is of great academic value to the development of phase change heat transfer theory on micro-nano scale. The research provides a theoretical basis for the design of heat dissipation system of electronic components under high heat flux and has important practical application value to promote the development of electronic industry in China. In this paper, a high speed photograph is used to visualize the bubble dynamics of the heat sink surface of different microgrooves with different vertical microgrooves. Rectangular microgrooves with different sizes were carved on the borosilicon glass plate by slicing process, and then the surface of the microgrooves was coated with a layer of titanium nano-coating with thickness of 250nm by magnetron sputtering to form a group of microgrooves with micro-nano composite structure. Distilled water was used as the working medium of the experiment. The temperature of distilled water was controlled at saturation temperature by heating and temperature control system, and then the micro-nano composite structure was heated by ceramic heating sheet. The bubble dynamics of micro / nano composite structure heat sink was observed by high speed photography. The temperature of thermal sink back and PTFE insulation of micro / nano composite structure was collected by data acquisition instrument. The images taken during the experiment are played back and saved by the software PCC2.3 of high-speed photography instrument, and the image marginalization of MATLAB is further processed to calculate the equivalent diameters of each stage in the process of bubble growth. In this paper, the shooting rate of the high speed camera is set to 6000 frames / s, and the interval between each two frames is 0.17ms. by checking the number of image frames in the bubble cycle, the bubble period and the waiting time of the bubble are obtained. According to the experimental results, it is found that under the same heat flux, the bubble equivalent diameter, bubble cycle and bubble waiting time decrease with the increase of the ratio of microgroove depth to width in the same depth micro-nano composite structure heat sink. In the heat sink of micro-nano composite structure with the same microgroove group structure, the equivalent diameter decreases with the increase of heat flux when the bubble ruptures, and at the same heat flux density, Compared with the equivalent diameter and the bubble period of the bubble rupture in the heat sink of the microgroove group without nano-coating, the equivalent diameter and the bubble period of the micro-nano composite structure with the same microgroove group structure are smaller. Both the bubble period and the waiting time of the bubble decrease with the increase of the heat flux, which is independent of the change of the microgroove size and the existence of nano-coating on the surface of the heat sink. The results show that the change of micro-scale structure of micro-groove group with micro-nano composite structure has more significant effect on the dynamic behavior of bubble than that of micro-groove group without nano-coating.
【學(xué)位授予單位】：吉首大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TB303

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本文編號(hào)：2150036