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为了了解偏心环形腔内非Boussinesq流体自然对流换热的特有现象和规律,本文利用有限容积法对垂直偏心环形腔内的冷水自然对流进行了二维数值模拟,得到了半径比为1.5时不同密度倒置参数、偏心率和Rayleigh数下的流场和温度场,并对不同条件下的平均Nusselt数进行了比较和分析。结果表明:密度倒置参数对流型结构起着决定性的作用,偏心率和Rayleigh数对流场影响较小;相同条件下,当密度倒置参数在0.5附近时,平均Nusselt数最小。
In order to understand the unique phenomena and laws of natural convection heat transfer of non-Boussinesq fluid in an eccentric annular cavity, a two-dimensional numerical simulation of the natural convection of cold water in a vertical eccentric annular cavity was carried out by finite volume method. Inverted parameters, eccentricity and Rayleigh number of flow field and temperature field, and under different conditions, the average Nusselt number were compared and analyzed. The results show that the density inversion parameter plays a decisive role in the flow structure, and the eccentricity and the Rayleigh number have less influence on the flow field. Under the same conditions, the average Nusselt number is the smallest when the density inversion parameter is around 0.5.