本文關(guān)鍵詞： 微通道 塑料薄膜 微換熱器 數(shù)值模擬 流動特性 傳熱特性　出處：《浙江大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：微通道塑料薄膜(Micro Capillary Film, MCF)是一種內(nèi)含數(shù)十條平行中空微通道的塑料薄膜,微通道尺寸為微米級,具有表面積體積比高、成本低、易于大批量生產(chǎn)的特點(diǎn),在微散熱器、微泵、微反應(yīng)器以及防偽技術(shù)等領(lǐng)域有廣闊的應(yīng)用前景。利用擠出加工技術(shù)制得的MCF寬14～22mm,厚0.6～0.9mm,28條水力直徑在50～300μm的微通道集成。研究了塑料薄膜微通道的幾何參數(shù)對流體流動與傳熱特性的影響規(guī)律,為MCF在微散熱器、防偽技術(shù)等領(lǐng)域的應(yīng)用提供理論參考,本文開展的主要工作有：首先,建立塑料薄膜微通道物理模型,對微通道內(nèi)流體流動與傳熱特性進(jìn)行理論研究和數(shù)值模擬。通過理論分析,建立微通道阻力系數(shù)、壓降、速度分布及努賽爾數(shù)(Nu)的數(shù)學(xué)模型。對不同長短軸比及不同水力直徑的橢圓微通道進(jìn)行數(shù)值分析,結(jié)果表明：在相同雷諾數(shù)下,橢圓微通道長短軸比越大,流體流動阻力越大,Nu數(shù)越低；在相同雷諾數(shù)下,微通道水力直徑越大,Nu數(shù)越大,其換熱效果越好。其次,設(shè)計(jì)搭建了塑料薄膜微通道流動與傳熱實(shí)驗(yàn)臺。以去離子水為流動工質(zhì),對三種不同尺寸的微通道塑料薄膜的流動與傳熱特性進(jìn)行了實(shí)驗(yàn)研究,分析了微通道幾何參數(shù)對壓降、摩擦系數(shù)和Nu數(shù)的影響,并將實(shí)驗(yàn)值與理論分析和數(shù)值模擬結(jié)果進(jìn)行對比,分析誤差產(chǎn)生原因,并對微通道流動與傳熱的理論模型進(jìn)行修正,為新型聚合物微散熱器的開發(fā)和應(yīng)用提供參考。最后,提出了一種基于微通道塑料薄膜的新型防偽技術(shù),拓展了MCF的應(yīng)用領(lǐng)域。搭建了微通道防偽油墨灌注實(shí)驗(yàn)裝置,探討了影響微通道油墨流動的因素。研究發(fā)現(xiàn),微通道長度、微通道水力直徑和油墨濃度是影響油墨在塑料薄膜微通道流動的主要因素,為微通道塑料薄膜在防偽領(lǐng)域的應(yīng)用提供理論依據(jù)。
[Abstract]:Microchannel plastic film Micro Capillary Film (MCFs) is a kind of plastic film containing dozens of parallel hollow microchannels. With high surface area volume ratio, low cost, easy to mass production characteristics, in the micro radiator, micro pump. The microreactor and anti-counterfeiting technology have a wide application prospect. The MCF prepared by extrusion technology has a width of 14 ~ 22 mm and a thickness of 0.6 ~ 0. 9 mm. 28 microchannels with a hydraulic diameter of 50 ~ 300 渭 m were integrated. The effect of geometric parameters of plastic film microchannels on fluid flow and heat transfer characteristics was studied. The results show that MCF is in the micro radiator. The application of anti-counterfeiting technology provides theoretical reference. The main work of this paper is as follows: firstly, the physical model of microchannel of plastic film is established. The flow and heat transfer characteristics in microchannels are studied theoretically and numerically. The resistance coefficient and pressure drop of microchannel are established by theoretical analysis. Numerical analysis of elliptical microchannels with different axial ratios and hydraulic diameters shows that under the same Reynolds number. The larger the ratio of the long to short axis of the elliptical microchannel is, the greater the flow resistance is, and the lower the Nu number is. At the same Reynolds number, the larger the hydraulic diameter of the microchannel, the better the heat transfer efficiency. Secondly, a plastic film micro-channel flow and heat transfer experiment platform was designed and built. Deionized water was used as the flow medium. The flow and heat transfer characteristics of three kinds of microchannel plastic films with different sizes were studied experimentally. The effects of geometric parameters of microchannel on pressure drop, friction coefficient and Nu number were analyzed. The experimental data are compared with the theoretical analysis and numerical simulation results, the causes of the errors are analyzed, and the theoretical model of microchannel flow and heat transfer is modified. Finally, a new anti-counterfeiting technology based on microchannel plastic film is proposed. The application field of MCF was expanded. The experiment device of anti-counterfeiting ink was set up, and the factors influencing the flow of micro-channel ink were discussed. The length of micro-channel was found. The hydraulic diameter of microchannel and the concentration of ink are the main factors affecting the flow of ink in the plastic film, which provides the theoretical basis for the application of microchannel plastic film in the field of anti-counterfeiting.
【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TK124

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本文編號：1493091