本文選題：側(cè)向局部加熱 + 破碎擾動　； 參考：《應(yīng)用力學(xué)學(xué)報》2016年03期

【摘要】：通過二維流體力學(xué)基本方程組的數(shù)值模擬,研究了普朗特數(shù)Pr=6.949時側(cè)向局部加熱腔體內(nèi)水平溫差驅(qū)動的自然對流。仔細(xì)觀察腔體內(nèi)水平流的入侵過程,發(fā)現(xiàn)在冷熱流體交接面的上下部位同時出現(xiàn)了冷入侵流和熱入侵流,并且在交匯處有破碎擾動波出現(xiàn)。揭示了周期性雙局部對流結(jié)構(gòu),并發(fā)現(xiàn)在右壁面溫度高于左壁面溫度區(qū)域頂部有對流卷生成,對流卷隨時間沿側(cè)壁面向腔體下部移動,最后消失,同時又有新對流卷在該區(qū)域頂部生成,這種現(xiàn)象重復(fù)循環(huán)著。結(jié)果表明:在右壁面溫度高于左壁面溫度區(qū)域,熱邊界層厚度(θδ)隨腔體高度增加而增大;在右壁面溫度等于左壁面溫度區(qū)域,θδ值隨腔體高度增加而減小;并且格拉曉夫數(shù)(Gr)越大,θδ值越小。
[Abstract]:Based on the numerical simulation of the basic equations of two-dimensional hydrodynamics, the natural convection driven by horizontal temperature difference in a laterally heated cavity with Plantt number pr = 6.949 is studied. After careful observation of the invasion process of horizontal flow in the cavity, it is found that the cold intrusion flow and the thermal intrusion flow occur simultaneously in the upper and lower parts of the interface of the cold and hot fluid, and there are broken disturbance waves at the junction. The periodic bi-local convection structure is revealed, and it is found that convection rolls are generated at the top of the region where the temperature of the right wall is higher than that of the left wall, and the convection rolls move along the sidewall to the lower part of the cavity with time, and finally disappear. At the same time, a new convection roll is formed at the top of the region, and this phenomenon repeats itself. The results show that the thickness of the thermal boundary layer (胃 未) increases with the increase of the height of the cavity in the region where the temperature of the right wall is higher than that of the left wall, and decreases with the increase of the height of the cavity when the temperature of the right wall is equal to the temperature of the left wall. And the larger the Gre number of Gracoff is, the smaller the value of 胃 未 is.
【作者單位】： 西安理工大學(xué)西北旱區(qū)生態(tài)水利工程國家重點實驗室培育基地;
【基金】：國家自然科學(xué)基金(10872164) 陜西省重點學(xué)科建設(shè)專項資金項目(00X901)
【分類號】：O35
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本文編號：1951226