Transient two-phase flow and heat transfer with localized heating in porous media

H. Y. Li, K. C. Leong, L. W. Jin, J. C. Chai

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

The transient behavior of two-phase flow and heat transfer in a channel filled with porous media was numerically studied in this paper. Based on the two-phase mixture model, numerical solutions were obtained using the Finite-Volume Method (FVM). Two methods to treat the discontinuous diffusion coefficient in the energy equation, i.e. the harmonic mean method and the "modified" Kirchhoff method were compared. It was found that the "modified" Kirchhoff method was better in dealing with the rapid change in the diffusion coefficient. Three different cases, with discrete heat flux applied at (1) the upper wall, (2) lower wall and (3) both the upper and lower walls were studied. The velocity and temperature fields for these cases were discussed. The results show that the liquid and vapor flow fields, as well as the temperature and liquid saturation fields have distinctly different features with the change in heating location. An analysis of the vapor volume fraction indicates that the largest amount of vapor with the highest vapor generation rate was for the case in which the heat flux is applied from the lower wall.

LanguageEnglish
Pages1115-1127
Number of pages13
JournalInternational Journal of Thermal Sciences
Volume49
Issue number7
Early online date1 Mar 2010
DOIs
Publication statusPublished - Jul 2010
Externally publishedYes

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two phase flow
Two phase flow
Porous materials
heat transfer
Vapors
vapors
Heat transfer
Heating
heating
Heat flux
heat flux
diffusion coefficient
liquid flow
finite volume method
Finite volume method
Liquids
Volume fraction
Flow fields
flow distribution
Temperature distribution

Cite this

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abstract = "The transient behavior of two-phase flow and heat transfer in a channel filled with porous media was numerically studied in this paper. Based on the two-phase mixture model, numerical solutions were obtained using the Finite-Volume Method (FVM). Two methods to treat the discontinuous diffusion coefficient in the energy equation, i.e. the harmonic mean method and the {"}modified{"} Kirchhoff method were compared. It was found that the {"}modified{"} Kirchhoff method was better in dealing with the rapid change in the diffusion coefficient. Three different cases, with discrete heat flux applied at (1) the upper wall, (2) lower wall and (3) both the upper and lower walls were studied. The velocity and temperature fields for these cases were discussed. The results show that the liquid and vapor flow fields, as well as the temperature and liquid saturation fields have distinctly different features with the change in heating location. An analysis of the vapor volume fraction indicates that the largest amount of vapor with the highest vapor generation rate was for the case in which the heat flux is applied from the lower wall.",
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Transient two-phase flow and heat transfer with localized heating in porous media. / Li, H. Y.; Leong, K. C.; Jin, L. W.; Chai, J. C.

In: International Journal of Thermal Sciences, Vol. 49, No. 7, 07.2010, p. 1115-1127.

Research output: Contribution to journalArticle

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AU - Leong, K. C.

AU - Jin, L. W.

AU - Chai, J. C.

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N2 - The transient behavior of two-phase flow and heat transfer in a channel filled with porous media was numerically studied in this paper. Based on the two-phase mixture model, numerical solutions were obtained using the Finite-Volume Method (FVM). Two methods to treat the discontinuous diffusion coefficient in the energy equation, i.e. the harmonic mean method and the "modified" Kirchhoff method were compared. It was found that the "modified" Kirchhoff method was better in dealing with the rapid change in the diffusion coefficient. Three different cases, with discrete heat flux applied at (1) the upper wall, (2) lower wall and (3) both the upper and lower walls were studied. The velocity and temperature fields for these cases were discussed. The results show that the liquid and vapor flow fields, as well as the temperature and liquid saturation fields have distinctly different features with the change in heating location. An analysis of the vapor volume fraction indicates that the largest amount of vapor with the highest vapor generation rate was for the case in which the heat flux is applied from the lower wall.

AB - The transient behavior of two-phase flow and heat transfer in a channel filled with porous media was numerically studied in this paper. Based on the two-phase mixture model, numerical solutions were obtained using the Finite-Volume Method (FVM). Two methods to treat the discontinuous diffusion coefficient in the energy equation, i.e. the harmonic mean method and the "modified" Kirchhoff method were compared. It was found that the "modified" Kirchhoff method was better in dealing with the rapid change in the diffusion coefficient. Three different cases, with discrete heat flux applied at (1) the upper wall, (2) lower wall and (3) both the upper and lower walls were studied. The velocity and temperature fields for these cases were discussed. The results show that the liquid and vapor flow fields, as well as the temperature and liquid saturation fields have distinctly different features with the change in heating location. An analysis of the vapor volume fraction indicates that the largest amount of vapor with the highest vapor generation rate was for the case in which the heat flux is applied from the lower wall.

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