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以数值模拟和实验验证相结合的方法研究了三维动态混合对流过程中的温度场发展规律,并定量地分析了在Re=1×10~5,Cr=±3.36×10~(12),Pr=0.7,L/H=3/4条件下矩形腔体内温度均匀性的动态变化特性。研究结果表明,对于相同大小的Grashof数和Reynolds数,当Gr>0时,腔体内有着更高的升/降温速率,而其升/降温过程中的整体温度不均度则高于Gr<0时的换热过程。当Gr>0时,竖直方向的温度不均匀度是影响腔体内温度均匀性的主导因素(σ_(竖直)》σ_(水平));而当Gr<0时,竖直方向和水平方向上的温度不均匀度共同影响腔体内的温度均匀性(σ_(竖直)≈σ_(水平))。
The development law of the temperature field in the three-dimensional dynamic mixed convection process was studied by the combination of numerical simulation and experimental verification. The effects of temperature on Reynolds number, Re = 1 × 10-5, Cr = ± 3.36 × 10-12, Pr = 0.7, L / H = 3/4 conditions of rectangular cavity temperature uniformity of the dynamic characteristics. The results show that for the same size Grashof number and Reynolds number, when Gr> 0, the cavity has a higher rate of temperature rise / cooling, while the temperature rise / cooling process of the overall temperature is higher than the Gr <0 When the heat transfer process. When Gr> 0, the vertical temperature unevenness is the dominant factor (σ_ (vertical) σ_ (horizontal)) which affects the temperature uniformity in the cavity. When Gr <0, the vertical and horizontal directions (Σ_ (vertical) ≈σ_ (horizontal)) in the cavity together with the temperature non-uniformity on the surface.