MERLOT: a model for flow and heat transfer through porous media for high heat flux applications

Raffray, A.R.; Pulsifer, J.

doi:10.1016/s0920-3796(02)00383-6

Cited by 17 publications

(10 citation statements)

References 10 publications

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“…Porous metal exchangers provide a large surface area, which directly influences the heat transfer. The pressure drop in porous media is dependent on the porosity of the medium, and HTC is dependent on the specific surface area [7]. Several porous medium heat exchangers have been proposed in the literature, and Cu, W, Ta etc.…”

Section: Helium Coolingmentioning

confidence: 99%

“…In order to accommodate 5 MW/m 2 heat flux and maintain the temperature of the tungsten below 1400°C, the required velocities are 11, 15, 53 m/s for porosity values of 50 %, 80 % and 95 %, with pressure drops of 0.32, 0.07 and 0.07, respectively. Using this concept it is also possible to accommodate 30 MW/m 2 , but in order to keep the surface temperature below 1400°C, it is necessary to have 120 m/s velocity with 80 % porosity, which leads to a pressure drop of 2 MPa [7,12]. The tungsten foam in the tube concept is shown in Figure 5, where the Chemical Vapor Deposition (CVD) technique is used for forming the W foam.…”

Section: Helium Coolingmentioning

confidence: 99%

See 1 more Smart Citation

Comparison of Cooling Schemes for High Heat Flux Components Cooling in Fusion Reactors

Domalapally

Entler

2015

Acta Polytech

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Section: Helium Coolingmentioning

confidence: 99%

Section: Helium Coolingmentioning

confidence: 99%

Comparison of Cooling Schemes for High Heat Flux Components Cooling in Fusion Reactors

Domalapally

Entler

2015

Acta Polytech

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“…Whereas, most of the previous works related to the single and two-phase convection processes which are possibly the more dominant method of heat transfer in geothermal systems. Studies on the boiling process and heat transfer phenomena in porous media have been generally experimental [1][2][3][4][5][6][7][8], and numerical [9][10][11][12][13][14][15][16] studies. The use of the porous medium in different applications to enhance the heat transfer rate and modify the heat transfer characteristics has been studied widely such as heat storage applications and heat exchangers [17][18][19][20][21][22][23][24][25][26][27][28][29][30][31].…”

Section: Introductionmentioning

confidence: 99%

Multiphase flow and boiling heat transfer modelling of nanofluids in horizontal tubes embedded in a metal foam

Mohammed

Sardari

Giddings

2019

International Journal of Thermal Sciences

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The aim of this numerical study is to evaluate the boiling process of nanofluid in horizontal tubes in the presence of a metal foam as a porous medium and represent the experimental work of Zhao et al. in a numerical aspect with a different range of dependent variables. High conductive metal foams are employed to increase the rate of heat transfer and enhance the boiling performance in the domain. The two-phase mixture model is used to simulate the characteristics of nanofluid and solve the governing equations in the two-phase flow and boiling heat transfer problem. R134a and ZnO are considered as the base-fluid and nanoparticles, respectively. The characteristics of the metal foam including the porosity and pore density as well as operating conditions including the fluid flow including the velocity, induced heat flux and concentration of nanoparticles on the pressure drop, vapour quality and heat transfer coefficient are examined. The results show the positive effect of the metal foam on the vapour production and overall heat transfer coefficient of the nanofluid in the pipe outlet; however, due to the flow resistance as a result of porous medium addition, a higher pressure drop is achieved. For the heat flux of 19 kW/m 2 and inlet velocity of 0.05m/s, by using a metal foam with the porosity of 70 % and pore density of 20 PPI, the vapour quality, heat transfer coefficient and pressure drop enhances by 7.1%, 9.4% and 82.7%, respectively, compared with the case of without metal foam. However, by using the porosity of 90 %, the vapour quality, heat transfer coefficient and pressure drop enhances by 1.6%, 3.5%, and 7.0%, respectively. Consequently, according to the developed results in this paper, a system with a moderate porosity and high pore density is recommended which is finally determined based on the required vapour production and allowed pressure drop.

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“…All thermophysical parameters in equation (1) are assumed to be known and constant. The equation (1) can be written in the form …”

Section: Introductionmentioning

confidence: 99%

The Finite Difference Method for transient convection-diffusion problems

Majchrzak¹,

Turchan²

2012

Sci. Res. Inst. Math. Comp. Sci.

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Abstract. The convection-diffusion equation (1D problem) is considered. At first, the unknown temperature T is expanded into a Taylor series with respect to time taking into account its three components. Next, using the convection-diffusion equation and equation obtained from the differentiation of this equation, the way of temperature T computations is shown. In this new equation the high order derivatives with respect to spatial co-ordinate appear and the approximation of these derivatives is also discussed. The explicit scheme is used and the stability criteria are formulated. Finally, the results of computations are shown.

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MERLOT: a model for flow and heat transfer through porous media for high heat flux applications

Cited by 17 publications

References 10 publications

Comparison of Cooling Schemes for High Heat Flux Components Cooling in Fusion Reactors

Comparison of Cooling Schemes for High Heat Flux Components Cooling in Fusion Reactors

Multiphase flow and boiling heat transfer modelling of nanofluids in horizontal tubes embedded in a metal foam

The Finite Difference Method for transient convection-diffusion problems

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