Numerical Study of Boiling in an Inclined Porous Layer

Najjari, Mustapha; Nasrallah, Sassi Ben

doi:10.1615/jpormedia.v6.i1.50

Cited by 23 publications

(15 citation statements)

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“…In this model, the number of differential governing equations was reduced only by algebraic relationships, without additional assumptions, and the interface tracking problem was also avoided with the enthalpy method. Thus, the TPMM is much convenient than the SPM, and widely used to solve the two-phase flow problems (Wang and Beckermann 1993;Peterson and Chang 1997;Waite and Amin 1999;Najjari and Nasrallah 2002;Wang 1997;Kazuhisa Yuki et al 2008).…”

Section: Introductionmentioning

confidence: 99%

A Numerical Investigation of Transpiration Cooling with Liquid Coolant Phase Change

Shi

Wang

2011

Transp Porous Med

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This article presents a numerical approach to investigate the transpiration cooling problems with coolant phase change within porous matrix. A new model is based on the coupling of the two-phase mixture model (TPMM) with the local thermal nonequilibrium (LTNE), and used to describe the liquid coolant phase change and heat exchange processes in this article. The effects of thermal conductivity, porosity, and sphere diameter of the porous matrix on the temperature and saturation distributions within the matrix are studied. The results indicate that an increase in the porosity or sphere diameter can lead to an area dilation of two-phase region and a rise of liquid temperature; whereas an increase in the thermal conductivity of the porous matrix results only in a rise of liquid temperature, but drops of solid temperature and temperature gradient on the hot surface. The influence of hot surface pressure on cooling effect is discussed by numerical simulations, and numerical results show that the effect of the transpiration cooling will be worse under higher pressure. The investigation also discovers an inverse phenomenon to the past investigations on the transpiration cooling without coolant phase change, namely in two-phase region, coolant temperature may be higher than solid temperature. This inversion can be captured only by the new LTNE-TPMM.

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Section: Introductionmentioning

confidence: 99%

A Numerical Investigation of Transpiration Cooling with Liquid Coolant Phase Change

Shi

Wang

2011

Transp Porous Med

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“…t = 0.1 s is chosen for all numerical resolutions. Numerical calculations in the porous region have been validated and used in previous studies [10][11][12]. In order to verify the validity of the code in the pure fluid region, we consider the case of forced air-flow parallel to an isotherm wall.…”

Section: Theoretical Analysis and Governing Parametersmentioning

confidence: 99%

Effects of latent heat storage on heat transfer in a forced flow in a porous layer

Najjari

Nasrallah

2008

International Journal of Thermal Sciences

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“…The model that we present here includes the determination of the thermodynamic equilibrium state at each point of the porous medium, and the appearance or the disappearance of phases. This model, which is an extension of (Wang and Beckerman, 1993;Ghafir, 2000;Najjari and Nasrallah, 2002) to cases where the energy equation cannot be written as an enthalpy balance, can be described by a set of equations, coupled with inequalities.…”

Section: Introductionmentioning

confidence: 99%

Boiling in Porous Media: Model and Simulations

et al. 2005

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We present a modelization of the heat and mass transfers within a porous medium, which takes into account phase transitions. Classical equations are derived for the mass conservation equation, whereas the equation of energy relies on an entropy balance adapted to the case of a rigid porous medium. The approximation of the solution is obtained using a finite volume scheme coupled with the management of phase transitions. This model is shown to apply in the case of an experiment of heat generation in a porous medium. The vapor phase appearance is well reproduced by the simulations, and the size of the two-phase region is correctly predicted. A result of this study is the evidence of the discrepancy between the air -water capillary and relative permeability curves and water -water vapor ones.

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Numerical Study of Boiling in an Inclined Porous Layer

Cited by 23 publications

References 0 publications

A Numerical Investigation of Transpiration Cooling with Liquid Coolant Phase Change

A Numerical Investigation of Transpiration Cooling with Liquid Coolant Phase Change

Effects of latent heat storage on heat transfer in a forced flow in a porous layer

Boiling in Porous Media: Model and Simulations

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