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Numerical study of the flow and heat transfer of bubbly flows in inclined channels

机译：气泡在倾斜通道中流动和传热的数值研究

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The effects of bubbles and inclination angle on the flow and heat transfer in a channel are examined by direct numerical simulations (DNS), where every continuum length and time scale are resolved using a front-tracking/finite volume method. Earlier simulations of bubbles in turbulent flows in vertical channels have shown that the presence of the bubbles increases the Nusselt number, compared to flow without bubbles. Here the flow and the enhancement of the heat transfer is described as a function of the angle of inclination of a channel where a constant heat flux is applied at the walls. The bubbles are nearly spherical and the void fraction is 3%. The results show that the temperature difference between the wall where the bubbles are concentrated and the fluid near to that wall is lower when the channel is inclined 30 degrees and 60 degrees than for vertical and horizontal channels, indicating that the heat transfer is more efficient in these cases. (C) 2015 Elsevier Inc. All rights reserved.
机译：气泡和倾斜角对通道中流动和传热的影响通过直接数值模拟（DNS）进行检查，其中每个连续体长度和时间尺度都使用前向跟踪/有限体积方法进行解析。较早的垂直通道中湍流中气泡的模拟表明，与没有气泡的流相比，气泡的存在会增加Nusselt数。这里，流动和传热的增强是根据通道的倾斜角来描述的，在通道上壁上施加恒定的热通量。气泡接近球形，空隙率为3％。结果表明，当通道倾斜30度和60度时，气泡集中的壁和靠近该壁的流体之间的温差要比垂直和水平通道低，这表明传热效率更高。这些情况。 （C）2015 Elsevier Inc.保留所有权利。

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