Simulation of turbulent non-isothermal polydisperse bubbly flow behind a sudden tube expansion

被引：0
作者：
M. A. Pakhomov
V. I. Terekhov
机构：
[1] Kutateladze Institute of Thermophysics SB RAS,
来源：
Thermophysics and Aeromechanics | 2016年 / 23卷
关键词：
bubble separated flow; turbulence; heat transfer enhancement; simulation;
D O I：
暂无
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学科分类号：
摘要：
The results of numerical simulation of the structure of non-isothermal polydisperse bubbly turbulent flow and heat transfer behind a sudden tube expansion are presented. The study was carried out at a change in the initial diameter of the air bubbles within dm1 = 1–5 mm and their volumetric void fraction β = 0–10 %. Small bubbles are available in almost the entire cross section of the tube, while the large bubbles pass mainly through the flow core. An increase in the size of dispersed phase causes the growth of turbulence in the liquid phase due to flow turbulization, when there is a separated flow of liquid past the large bubbles. Adding the air bubbles causes a significant reduction in the length of the separation zone and heat transfer enhancement, and these effects increase with increasing bubble size and their gas volumetric flow rate ratio.
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页码：693 / 699
页数：6
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