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Numerical Investigation on Wake of Single Air Bubble Rising in Narrow Rectangular Channel


Documents: Full paper available in Conference Proceedings.
 
Date: Monday October 19
Time:16:15 - 16:40
 
Session:1B1: ThermalHydraulics & Safety I
 
Authors: Liqin Zhang (Nuclear Power Institute of China, China)
Yanping Huang (Nuclear Power Institute of China, China)
Yuanfeng Zan (Nuclear Power Institute of China, China)
Junfeng Wang (Nuclear Power Institute of China, China)
Abstract:

A wake is closely related to bubble interaction, which might influence the flow regime’s evolution and transition in two phase flow. In the present paper, length and flow patterns of the wake of a single air bubble rising in a vertical narrow rectangular channel was numerically studied, and correlations with dimensionless numbers, obtained from dimensional analysis for wake length calculations, were fitted. The cross section of the rectangular channel was 60× 2 mm2 , and bubbles with diameter of 2.0-22.0 mm rising in a stagnant fluid were calculated with the VOF model. Investigations on the wake of single air bubbles are of fundamental significance to disclosure differences between air-water and vapor-water two phase flow regimes from the microscopic view in a narrow rectangular channel.

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