Fundamental consideration of wall heat partition of vertical subcooled boiling flows

被引：61

作者：

Yeoh, G. H. ^{[1
]}

Cheung, Sherman C. P. ^{[2
]}

Tu, J. Y. ^{[2
]}

Ho, Mark K. M. ^{[1
]}

机构：

[1] Australian Nucl Sci & Technol Org, Menai, NSW 2234, Australia

[2] RMIT Univ, Sch Aerosp Mech & Mfg Engn, Bundoora, Vic 3083, Australia

来源：

INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER | 2008年 / 51卷 / 15-16期

基金：

澳大利亚研究理事会;

关键词：

population balance; bubbly flow; CFD; average bubble number density;

D O I：

10.1016/j.ijheatmasstransfer.2007.11.047

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

Improved wall heat flux partitioning accounting sliding bubbles and a mechanistic model that incorporates the fundamental consideration of bubble frequency during low-pressure subcooled flow boiling is presented. A model considering the forces acting on departing bubbles at the heated surface is employed. Coupled with a three-dimensional two-fluid and population balance equations based on the modified MUSIG (MUltiple-SIze-Group) model, the behavior of an upward forced convective subcooled boiling flows in a vertical annular channel is simulated. Comparison of model predictions against local and axial measurements (heat fluxes ranged from 152.9 to 705.0 kW/m(2)) is made for the void fraction, Sauter mean bubble diameter and interfacial area concentration covering a range of different mass and heat fluxes and inlet subcoolings. Good agreement is achieved between the predicted and measured profiles. Reasonable agreement with recent experimental measurements is also attained for the predicted growth and waiting times of bubble frequency at particular local wall superheat and subcooling temperatures. (C) 2008 Elsevier Ltd. All rights reserved.

引用

页码：3840 / 3853

页数：14