方腔内不同偏心比圆管相变蓄热过程数值模拟

Simulation of the Effect of Eccentricity of Circular Tube in PCM-filled Cavity

方腔内相变材料受热后由于自然对流作用导致熔化不均匀,为改善此状况,采用不同偏心比的圆管、Fluent中Solidification/Melting模型进行模拟,并对照文献中实验结果,分析不同偏心比圆管、无量纲管壁温度Ste数、无量纲相变材料初温G数对熔化影响。结果表明:当偏心率增加到0.25、0.5和0.75时,熔化时间分别减小了近1/3、1/2、2/3。Ste数从0.072增加到0.134和0.228时,熔化时间分别降低了1/8和1/5。当G数从0.36降到0.23和0.11时,熔化时间分别减少了1/10、1/5。

After the heating of the Phase Change Material in the cavity,the melting is not even due to the natural convection.In order to change this situation,the circular tube with different eccentricity is adopted with reasonable assumptions,andthe Solidification/Melting model is utilized in Fluent to simulate the relevant working conditions,and the corresponding experimental results were compared.The effects of different eccentric ratio circular tube are analyzed,as well as the dimensionless wall temperature Ste,and Numberless elemental phase change material initial temperature G.When the eccentricity increased to 0.25,0.5,and 0.75,the melting time decreased by nearly 1/3,1/2,and 2/3,respectively.When the Ste increases from 0.072 to 0.134 and 0.228,the melting time decreases by 1/8 and 1/5,respectively.When the G value dropped from 0.36 to 0.23 and 0.11,the melting time decreased by 1/10 and 1/5,respectively.