Buoyancy-induced flows and phase-change heat transfer in a vertical capillary structure with symmetric heating

T. S. Zhao, P. Cheng, C. Y. Wang

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

This paper presents a numerical solution of a buoyancy-induced flow and phase-change heat transfer in a vertical porous channel heated symmetrically along its vertical walls. A multiphase mixture model that accounts for complex, interacting physical phenomena such as phase change, capillary action, buoyancy-induced flow convection in the subcooled liquid and multi-dimensional effects was used. It is found that for both single and the two-phase flow with a rather low vapor fraction, the induced mass flux increases as the applied heat flux is increased. However, as the vapor fraction is increased, the numerical results show that the induced mass flux drops drastically and remains approximately constant afterwards. This result agrees qualitatively with our previous experimental study on phase-change heat transfer in a heated vertical porous tube (Zhao et al., 1998. ASME Journal of Heat Transfer, 121(3) 646-652). In this paper, the underlying mechanism leading to this interesting behavior is explained based on the liquid saturation distributions as well as the velocity fields for both vapor and liquid in the porous column. (C) 2000 Elsevier Science Ltd. All rights reserved.

Original languageEnglish (US)
Pages (from-to)2653-2661
Number of pages9
JournalChemical Engineering Science
Volume55
Issue number14
DOIs
StatePublished - Apr 7 2000

Fingerprint

Buoyancy
Vapors
Heat transfer
Heating
Liquids
Mass transfer
Two phase flow
Heat flux

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

Cite this

@article{a775855a6859427bb6f12ffe65b078b7,
title = "Buoyancy-induced flows and phase-change heat transfer in a vertical capillary structure with symmetric heating",
abstract = "This paper presents a numerical solution of a buoyancy-induced flow and phase-change heat transfer in a vertical porous channel heated symmetrically along its vertical walls. A multiphase mixture model that accounts for complex, interacting physical phenomena such as phase change, capillary action, buoyancy-induced flow convection in the subcooled liquid and multi-dimensional effects was used. It is found that for both single and the two-phase flow with a rather low vapor fraction, the induced mass flux increases as the applied heat flux is increased. However, as the vapor fraction is increased, the numerical results show that the induced mass flux drops drastically and remains approximately constant afterwards. This result agrees qualitatively with our previous experimental study on phase-change heat transfer in a heated vertical porous tube (Zhao et al., 1998. ASME Journal of Heat Transfer, 121(3) 646-652). In this paper, the underlying mechanism leading to this interesting behavior is explained based on the liquid saturation distributions as well as the velocity fields for both vapor and liquid in the porous column. (C) 2000 Elsevier Science Ltd. All rights reserved.",
author = "Zhao, {T. S.} and P. Cheng and Wang, {C. Y.}",
year = "2000",
month = "4",
day = "7",
doi = "10.1016/S0009-2509(99)00530-8",
language = "English (US)",
volume = "55",
pages = "2653--2661",
journal = "Chemical Engineering Science",
issn = "0009-2509",
publisher = "Elsevier BV",
number = "14",

}

Buoyancy-induced flows and phase-change heat transfer in a vertical capillary structure with symmetric heating. / Zhao, T. S.; Cheng, P.; Wang, C. Y.

In: Chemical Engineering Science, Vol. 55, No. 14, 07.04.2000, p. 2653-2661.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Buoyancy-induced flows and phase-change heat transfer in a vertical capillary structure with symmetric heating

AU - Zhao, T. S.

AU - Cheng, P.

AU - Wang, C. Y.

PY - 2000/4/7

Y1 - 2000/4/7

N2 - This paper presents a numerical solution of a buoyancy-induced flow and phase-change heat transfer in a vertical porous channel heated symmetrically along its vertical walls. A multiphase mixture model that accounts for complex, interacting physical phenomena such as phase change, capillary action, buoyancy-induced flow convection in the subcooled liquid and multi-dimensional effects was used. It is found that for both single and the two-phase flow with a rather low vapor fraction, the induced mass flux increases as the applied heat flux is increased. However, as the vapor fraction is increased, the numerical results show that the induced mass flux drops drastically and remains approximately constant afterwards. This result agrees qualitatively with our previous experimental study on phase-change heat transfer in a heated vertical porous tube (Zhao et al., 1998. ASME Journal of Heat Transfer, 121(3) 646-652). In this paper, the underlying mechanism leading to this interesting behavior is explained based on the liquid saturation distributions as well as the velocity fields for both vapor and liquid in the porous column. (C) 2000 Elsevier Science Ltd. All rights reserved.

AB - This paper presents a numerical solution of a buoyancy-induced flow and phase-change heat transfer in a vertical porous channel heated symmetrically along its vertical walls. A multiphase mixture model that accounts for complex, interacting physical phenomena such as phase change, capillary action, buoyancy-induced flow convection in the subcooled liquid and multi-dimensional effects was used. It is found that for both single and the two-phase flow with a rather low vapor fraction, the induced mass flux increases as the applied heat flux is increased. However, as the vapor fraction is increased, the numerical results show that the induced mass flux drops drastically and remains approximately constant afterwards. This result agrees qualitatively with our previous experimental study on phase-change heat transfer in a heated vertical porous tube (Zhao et al., 1998. ASME Journal of Heat Transfer, 121(3) 646-652). In this paper, the underlying mechanism leading to this interesting behavior is explained based on the liquid saturation distributions as well as the velocity fields for both vapor and liquid in the porous column. (C) 2000 Elsevier Science Ltd. All rights reserved.

UR - http://www.scopus.com/inward/record.url?scp=0034615855&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0034615855&partnerID=8YFLogxK

U2 - 10.1016/S0009-2509(99)00530-8

DO - 10.1016/S0009-2509(99)00530-8

M3 - Article

AN - SCOPUS:0034615855

VL - 55

SP - 2653

EP - 2661

JO - Chemical Engineering Science

JF - Chemical Engineering Science

SN - 0009-2509

IS - 14

ER -