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为估计M arangon i对流和自然对流对汽泡周围流场的影响,对加热面朝上和朝下的不同大小和过冷度的汽泡周围温度场进行了测量。通过比较测量所得温度场和带N av ier-S tokes方程的数值模拟结果可知,在完全没有浮升力时,M arangon i流会使得流场呈现一个向下的类似于射流的形状,但有了浮升力,向下的流动会立刻转向上,在加热表面附近形成涡流。即使加热面朝下,这种浮升力引起的自然对流依然影响整个流场,以至于这个系统不能很好地表现在微重力条件下的汽泡周围的流场。
In order to estimate the influence of convection and natural convection on the flow field around Bubbling, the temperature field around the bubbles with different sizes and subcooling degrees facing upward and downward are measured. By comparing the measured temperature field with the numerical simulation results with N av ier-S tokes equation, we can see that in the absence of any buoyancy force, the Marangoni flow will cause the flow field to have a downward jet-like shape. However, Floating force, the downward flow will immediately turn up, the formation of eddy currents in the vicinity of the surface. Even with the heating side down, the natural convection caused by this buoyancy still affects the entire flow field so that the system does not adequately represent the flow field around the bubble under microgravity.