Large eddy simulation of the two-phase flow pattern and bubble formation process of a flow mixing nozzle under a gas-liquid mode

被引：6

作者：

Zhao, Jin ^{[1
,2
]}

Ning, Zhi ^{[1
,2
]}

Lv, Ming ^{[1
,2
]}

机构：

[1] Beijing Jiaotong Univ, Sch Mech Elect & Control Engn, Beijing 100044, Peoples R China

[2] Beijing Jiaotong Univ, Beijing Key Lab Powertrain New Energy Vehicle, Beijing 100044, Peoples R China

来源：

FLUID DYNAMICS RESEARCH | 2019年 / 51卷 / 05期

基金：

中国国家自然科学基金; 北京市自然科学基金;

关键词：

flow mixing nozzle; gas-liquid mode; two-phase flow pattern; bubble formation; numerical simulation; GENERATION;

D O I：

10.1088/1873-7005/ab3f7e

中图分类号：

O3 [力学];

学科分类号：

08 ; 0801 ;

摘要：

The micro-bubbles can be stably generated in the flow mixing nozzle under gas-liquid mode, which has broad applications, but the study of its flow morphology remains insufficient. This paper assesses the flow pattern and bubble formation process of the flow mixing nozzle under gas-liquid mode using a combination of the large-eddy simulation method and the volume of fluid method. Compared with the liquid-gas mode, the flow pattern in the gas-liquid mode is relatively simple, with only three flow patterns: bubbly flow, breakup, and their transitional flow patterns. The results demonstrate that the main factors that change the flow pattern of the flow mixing nozzle under gas-liquid mode are the inertial force of the two-phase and the density difference between the two phases. The nozzle mixing zone area is defined as the characteristic area scale, and the ratio of the bubble sectional area and nozzle mixing zone is used as the bubble characteristic. The fitting curves of the bubble characteristic and the gas-liquid relative inertial force are also provided.

引用

页数：16

共 15 条

[1] Experimental study on droplet generation in flow focusing devices considering a stratified flow with viscosity contrast [J].