本文選題：多孔圍護(hù)結(jié)構(gòu)　切入點(diǎn)：自然對(duì)流　出處：《遼寧工程技術(shù)大學(xué)》2015年碩士論文

【摘要】：開展多孔圍護(hù)結(jié)構(gòu)封閉腔體內(nèi)部傳熱傳質(zhì)研究,認(rèn)識(shí)其自然對(duì)流傳熱傳質(zhì)的行為、基本特性規(guī)律,對(duì)包含外部圍護(hù)結(jié)構(gòu)下的建筑室內(nèi)溫度控制、微環(huán)境的創(chuàng)造以及建筑節(jié)能新技術(shù)的發(fā)展有巨大的指導(dǎo)意義。本文將理論分析與數(shù)值模擬的方法應(yīng)用于多孔圍護(hù)結(jié)構(gòu)封閉腔體內(nèi)部自然對(duì)流與傳熱傳質(zhì)的研究中；對(duì)多孔結(jié)構(gòu)的厚度及位置、孔隙率、瑞利數(shù)、路易斯數(shù)、浮升比數(shù)以及研究對(duì)象的高寬比等影響因素等進(jìn)行數(shù)值求解得到腔內(nèi)流場(chǎng)分布、溫度及濃度分布；進(jìn)一步進(jìn)行理論分析得出：自然對(duì)流傳熱傳質(zhì)行為、基本特性規(guī)律。首先,采用理論和數(shù)值方法研究二維多孔圍護(hù)結(jié)構(gòu)封閉腔體內(nèi)部的傳熱傳質(zhì)問題,將數(shù)值計(jì)算的平均努賽爾數(shù)Nu與其基準(zhǔn)解進(jìn)行對(duì)比,得到其最大誤差為0.81%,驗(yàn)證了數(shù)值方法的正確性。其次,利用一區(qū)域模型研究上述影響因素不同時(shí)模型內(nèi)部的流動(dòng)結(jié)構(gòu)、傳熱和傳質(zhì)效果。得出：多孔結(jié)構(gòu)厚度增加會(huì)削弱腔體內(nèi)流體傳熱傳質(zhì)效果,并且多孔結(jié)構(gòu)所在位置不同削弱程度不同,當(dāng)多孔結(jié)構(gòu)在腔體中間區(qū)域時(shí)蓄熱效果最好；孔隙率ε增大,Nu與Sh減小,對(duì)流換熱的強(qiáng)度與傳質(zhì)強(qiáng)度減弱；當(dāng)Le1時(shí),溫度對(duì)傳熱傳質(zhì)的影響較劇烈,當(dāng)Le1時(shí),濃度對(duì)傳熱傳質(zhì)影響較劇烈,當(dāng)Le=1,兩種影響相當(dāng),Nu=Sh；在浮升比N=-1時(shí),流體流動(dòng)強(qiáng)度及傳熱傳質(zhì)強(qiáng)度最微弱,N-1,腔體內(nèi)流動(dòng)為逆時(shí)針方向,質(zhì)浮升力占主導(dǎo)地位,N＞-1,腔體內(nèi)流動(dòng)為順時(shí)針方向,熱浮升力占主導(dǎo)地位；Nu和Sh隨著高寬比增大而增大,傳熱和傳質(zhì)的效果越來越明顯；左側(cè)垂直壁面為線性溫度邊界條件時(shí),隨著多孔結(jié)構(gòu)的厚度的增大,腔內(nèi)由對(duì)流為主的換熱方式向以導(dǎo)熱為主的換熱方式過渡。局部高溫壁面下,對(duì)于腔體內(nèi)局部高溫壁面不同位置處的傳熱傳質(zhì)情況,Nu和Sh先增大后減小,且B=0.6時(shí)Nu和Sh最大,而B的增加流動(dòng)強(qiáng)度是增加的。再次,研究多孔圍護(hù)結(jié)構(gòu)封閉腔體模型應(yīng)用在多孔介質(zhì)接觸型集熱墻體傳熱分析中,得出：多孔結(jié)構(gòu)起到有效的蓄熱效果；對(duì)比材料中,石英巖蓄熱效果最好；材料的熱工性能對(duì)蓄熱效果有直接影響。
[Abstract]:The study of heat and mass transfer inside the enclosed cavity of porous enclosure is carried out to understand the behavior of natural convection heat and mass transfer, the basic characteristic law, and to control the indoor temperature of the building including the external enclosure structure.The creation of micro-environment and the development of new building energy-saving technology have great guiding significance.In this paper, the theoretical analysis and numerical simulation are applied to the study of natural convection and heat and mass transfer in a closed cavity of a porous enclosure, and the thickness and location of porous structure, porosity, Rayleigh number, Lewis number,The flow field distribution, temperature and concentration distribution in the cavity are obtained by numerical solution of the factors such as the floating ratio and the aspect ratio of the studied object, and the theoretical analysis shows that the natural convection heat and mass transfer behavior and the basic characteristics of the flow field are obtained.Firstly, the heat and mass transfer problem in a closed cavity of a two-dimensional porous enclosure structure is studied by using theory and numerical method, and the numerical average Nussel number Nu is compared with its datum solution.The maximum error is 0. 81, which verifies the correctness of the numerical method.Secondly, the flow structure, heat transfer and mass transfer effect of the above factors are studied by using a regional model.It is concluded that the effect of heat and mass transfer of fluid in the cavity will be weakened by increasing the thickness of porous structure, and the effect of heat storage is best when the porous structure is located in the middle region of the cavity, and the porosity 蔚 increases and decreases with the decrease of Nu and Sh.The intensity and mass transfer intensity of convection heat transfer is weakened, the effect of temperature on heat and mass transfer is more intense when Le1, concentration on heat and mass transfer is more intense when Le1, and the two kinds of effects are quite different when Le1 is 1, and when the ratio of floating rise is N- 1, the effect of temperature on heat and mass transfer is more severe.The fluid flow intensity and heat and mass transfer intensity are the weakest, the flow in the cavity is counterclockwise, the mass floating lift is dominant, the flow in the cavity is clockwise, and the thermal floating lift is dominant, Nu and Sh increase with the increase of the ratio of height to width.The effect of heat and mass transfer is more and more obvious, and when the left vertical wall is linear temperature boundary condition, with the increase of the thickness of porous structure, the heat transfer mode in the cavity is from convection to heat conduction.In the case of local high temperature wall, Nu and Sh increase first and then decrease under different positions of local high temperature wall, and Nu and Sh are the largest at B0. 6, but the increase of flow intensity of B is increased.Thirdly, the closed cavity model of porous enclosure structure is applied to the heat transfer analysis of contact heat collecting wall in porous media. It is concluded that the porous structure plays an effective heat storage effect, and the quartzite has the best heat storage effect in contrast materials.The thermal properties of the materials have a direct effect on the thermal storage effect.
【學(xué)位授予單位】：遼寧工程技術(shù)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TU111.4

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