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首页> 外文期刊>International Journal of Heat and Mass Transfer >Experimental and numerical study of downward bubbly flow in a pipe
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Experimental and numerical study of downward bubbly flow in a pipe

机译：管道中气泡向下流动的实验和数值研究

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An experimental and numerical study of the local structure of downward gas-liquid flow in a vertical pipe with 20-mm inner diameter is reported. In the experiment, the electrodiffusion technique was used in combination with electrical conductivity measurements. To examine the effect of gas-phase dispersion on flow characteristics, two different gas-liquid mixers were used capable of producing large-diameter ( > 1 mm) and small-diameter ( < 1 mm) gas bubbles at identical rate characteristics of the flow. The unified heterogeneous-medium mechanics approach was used to develop, in the Eulerian two-velocity approximation, a calculation model for downward turbulent liquid/air bubble flows. It is shown that, as the volumetric gas flow rate of the mixture at the inlet to the pipe increases, local maxima of continuous phase velocity and bubble concentration emerge in the near-wall zone of the flow, with liquid turbulence suppressed in the wall zone and enhanced in the core of the flow.
机译：报道了对内径为20mm的垂直管中的气-液向下流动的局部结构的实验和数值研究。在实验中，电扩散技术与电导率测量结合使用。为了检查气相分散液对流动特性的影响，使用了两种不同的气液混合器，它们能够以相同的流速特性产生大直径（> 1 mm）和小直径（<1 mm）气泡。采用统一的非均质介质力学方法，以欧拉二速度近似方法开发了向下湍流的液体/气泡流动的计算模型。结果表明，随着混合物在管道入口处的体积气体流速的增加，连续相速度和气泡浓度的局部最大值出现在流的近壁区域，而在壁区域中的液体湍流得到抑制并增强了流程的核心。

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