多孔介質(zhì)中的自發(fā)芯吸流動(dòng)近年來(lái)受到了很多關(guān)注,并在許多領(lǐng)域得到廣泛應(yīng)用,如石油開采,農(nóng)業(yè)灌溉,熱管散熱,微流體泵送等。例如,在集成電路行業(yè),電子器件的小型化已成為發(fā)展的主流趨勢(shì)。隨著電子器件的特征尺寸不斷減小,芯片的集成度,封裝密度和工作效率不斷增加,使芯片的熱通量密度迅速上升。熱管作為高效的散熱裝置得到了廣泛的應(yīng)用�，F(xiàn)代熱管技術(shù)通常使用高空隙率的材料如泡沫金屬作為吸液芯來(lái)來(lái)提高散熱效率,近年來(lái)這種材料的芯吸流動(dòng)的行為引起了很多關(guān)注。盡管已經(jīng)有許多模型來(lái)描述不同多孔材料中的芯吸流動(dòng)行為,但這些模型都適用于低孔隙率材料,例如土壤滲流和巖石裂隙流動(dòng)等。對(duì)于高孔隙率的開孔材料,由于孔之間相互連通,結(jié)構(gòu)復(fù)雜,流體與固體之間的相互作用比較復(fù)雜,因此沒(méi)有一個(gè)具體的模型來(lái)描述高孔隙的芯吸流動(dòng)過(guò)程。本研究的目的是研究具有開孔結(jié)構(gòu)的泡沫金屬中的微流體運(yùn)動(dòng)機(jī)理。研究的的對(duì)象是表面經(jīng)過(guò)處理的泡沫銅。影響多孔材料的芯吸性能有很多因素,如孔徑大小,固-液接觸角,孔隙率等。在研究中我們首先對(duì)泡沫銅進(jìn)行表面處理,使其表面覆蓋一層納米結(jié)構(gòu),從而表面變成具有接近零接觸角的超親水性,從而大大的提高了芯吸能力。對(duì)于泡沫銅的... 

【文章來(lái)源】：哈爾濱工業(yè)大學(xué)黑龍江省 211工程院校 985工程院校

【文章頁(yè)數(shù)】：63 頁(yè)

【學(xué)位級(jí)別】：碩士

【文章目錄】：
摘要
Abstract
Acknowledgement
Nomenclature
Chapter1 Introduction
    1.1 Background
        1.1.1 Overview of porous media
        1.1.2 Spontaneous wicking in porous media
        1.1.3 Significance of research
    1.2 Literature review
        1.2.1 Research on wicking rise phenomenon
        1.2.2 Research on flow in metal foams
    1.3 Objectives
    1.4 Thesis outline
Chapter2 Theory of capillary flows
    2.1 Wicking in a capillary tube
    2.2 Wicking in porous media
    2.3 Summary
Chapter3 Experimental details
    3.1 Material preparation
        3.1.1 Determination of oxidation solution concentration
        3.1.2 Super hydrophilic treatment of copper foams
    3.2 Measurement of parameters
        3.2.1 Contact angle
        3.2.2 Characterization by SEM
        3.2.3 Porosity
    3.3 Wicking experiment set up
    3.4 Wicking experiment under the microscope
    3.5 Summary
Chapter4 Results and discussion
    4.1 Result of the super hydrophilic treatment
        4.1.1 Contact angles of cooper sheets
        4.1.2 Contact angle of treated copper foams
    4.2 Morphological characterization by SEM
    4.3 Measurement results of porosity
    4.4 Image analysis
    4.5 Result of wicking
        4.5.1 Results of samples with pore size50μm
        4.5.2 Results of samples with pore density90PPI
        4.5.3 Verification of wicking stratification
        4.5.4 Calculation of permeability and effective radius
        4.5.5 Summary
Conclusions
References
Author’s Publications
中文摘要


【參考文獻(xiàn)】：
期刊論文
[1]超輕多孔泡沫金屬平板熱管的傳熱性能研究[J]. 紀(jì)獻(xiàn)兵,徐進(jìn)良,Abanda Aime Marthial,薛強(qiáng).  中國(guó)電機(jī)工程學(xué)報(bào). 2013(02)



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