水平管外液膜液滴作用下的蒸汽流动特性

为研究水平管外液体和气体相互作用下的两相流动特性,选择蒸发器中广泛应用的转角正方形排列管束为物理模型,采用流体体积函数（VOF）方法追踪气液界面,提出液体在管间以液滴形式存在的模型假设,结合管间空隙率数据来初始化水平管外液膜厚度和液滴直径,模拟蒸汽在管外液膜和管间液滴作用下的流动过程,分析气液两相的压力场和速度场.结果表明：小喷淋密度下,进出口压降计算值和实验吻合良好;在计算域内,下部区域压力值高于上部区域,且最小压力分布在液滴附近的右下侧区域;压力分布的不均会造成液滴在下落过程中的变形....

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Bibliographic Details
Published in东北大学学报（自然科学版） Vol. 37; no. 6; pp. 856 - 860
Main Author 刘华 龚路远 沈胜强 陈学
Format Journal Article
LanguageChinese
Published 大连理工大学海洋能源利用与节能教育部重点实验室，辽宁大连 116024 2016
燕山大学车辆与能源学院，河北秦皇岛 066004%大连理工大学海洋能源利用与节能教育部重点实验室,辽宁大连,116024
Subjects
VOF模型
流动特性
液滴
液膜
空隙率
空隙率
液膜
liquid film
VOF模型
void fraction
流动特性
VOF model
flow characteristic
液滴
liquid droplet
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ISSN1005-3026
DOI10.3969/j.issn.1005-3026.2016.06.020

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Summary:为研究水平管外液体和气体相互作用下的两相流动特性,选择蒸发器中广泛应用的转角正方形排列管束为物理模型,采用流体体积函数（VOF）方法追踪气液界面,提出液体在管间以液滴形式存在的模型假设,结合管间空隙率数据来初始化水平管外液膜厚度和液滴直径,模拟蒸汽在管外液膜和管间液滴作用下的流动过程,分析气液两相的压力场和速度场.结果表明：小喷淋密度下,进出口压降计算值和实验吻合良好;在计算域内,下部区域压力值高于上部区域,且最小压力分布在液滴附近的右下侧区域;压力分布的不均会造成液滴在下落过程中的变形.
Bibliography:To investigate the two-phase flow characteristics under the interaction of liquid and gas over horizontal tubes, the rotated-square arranged tube bank was chosen and the VOF method was employed to propose an intertube droplet model. The thickness of liquid film and the droplet diameter was initialized according to the void fraction. The steam flowing process under the interaction of liquid film and droplet was simulated. The analyses of velocity field and pressure field were also illustrated. The results indicate that the calculated value of pressure drop coincides well with the experimental data at the small spray density. In the computational zone, the pressure in the bottom area is higher than that in upper area, and the minimum pressure distribution is in the lower right side near the droplet. The deformation of the liquid droplet in falling process is caused by the uneven distribution of pressure.
21-1344/T
VOF model; flow characteristic; void fraction; liquid film; liquid droplet
LIU Hua, GONG Lu-yuan , SH
ISSN:1005-3026
DOI:10.3969/j.issn.1005-3026.2016.06.020