Heat transfer enhancements in heat exchangers fitted with porous media Part I: constant wall temperature

Hydrocarbon fuel has been widely used in airbreathing scramjets and liquid rocket engines as coolant and propellant. However, possible heat transfer deterioration and threats from local high heat flux area in scramjet make heat transfer enhancement essential. In this work, 2-D steady numerical simulation was carried out to study different schemes of heat transfer enhancement based on a partially filled porous media in a tube. Both boundary and central layouts were analyzed and effects of gradient porous media were also compared. The results show that heat transfer in the transcritical area is enhanced at least 3 times with the current configuration compared to the clear tube. Besides, the proper use of gradient porous media also enhances the heat transfer compared to homogenous porous media, which could help to avoid possible overtemperature in the thermal protection.

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“…AA. Mohamad found similar results with a two dimensional model and the best porous radius ratio was discussed [22]. M.E.…”

Section: Introductionsupporting

confidence: 68%

Numerical heat transfer analysis of transcritical hydrocarbon fuel flow in a tube partially filled with porous media

et al. 2016

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“…Examples include the following. Mohamad [22] studies the numerical flow and heat transfer in a semi-porous tube. This research has been investigated for a completely filled pipe with porous material and a tube in which the porous material has been embedded in the tube center.…”

Section: Numerical Studiesmentioning

confidence: 99%

“…The schematic of the pipe and plate, investigated by Mohamad [22] Solving the flow and energy equations in this work is an integrated that simultaneously involves both environments. In the fluid environment without porous material its equations and in the porous medium are also solved for its equations, and for the boundary grains that are at the interface between the two environments and half of it inside the fluid and the other half The porous medium, the average harmonic value of fluid properties such as viscosity and conduction heat transfer coefficient are placed in equations.…”

Section: Figmentioning

confidence: 99%

Using Porous Media to Enhancement of Heat Transfer in Heat Exchangers

Rashidian¹,

Tavakoli²

2017

IJAEMS

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“…They showed that Nusselt number is strongly affected from the thickness of porous layer and thermal conductivity ratio rather than the other parameters. The optimum porous thickness ratio for partially filled ducts or channels with concerning about pressure drop was obtained by Mohamad (2003). It is stated that the inertia term has significant effect on Nu number, but it is not valid for highly porous domains.…”

Section: Introductionmentioning

confidence: 99%

Effect of an Inserted Porous Layer Located at a Wall of a Parallel Plate Channel on Forced Convection Heat Transfer

2013

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A theoretical study is performed on heat and fluid flow in partially porous medium filled parallel plate channel. A uniform symmetrical heat flux is imposed onto the boundaries of the channel partially filled with porous medium. The dimensional forms of the governing equations are solved numerically for different permeability and effective thermal conductivity ratios. Then, the governing equations are made dimensionless and solved analytically. The results of two approaches are compared and an excellent agreement is observed, indicating correctness of the both solutions. An overall Nusselt number is defined based on overall thermal conductivity and difference between the average temperature of walls and mean temperature to compare heat transfer in different channels with different porous layer thickness, Darcy number, and thermal conductivity ratio. Moreover, individual Nusselt numbers for upper and lower walls are also defined and obtained. The obtained results show that the maximum overall Nusselt number is achieved for thermal conductivity ratio of 1. At specific values of Darcy number and thermal conductivity ratio, individual Nusselt numbers approach to infinity since the value of wall temperatures approaches to mean temperature.

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Heat transfer enhancements in heat exchangers fitted with porous media Part I: constant wall temperature

Cited by 208 publications

References 12 publications

Numerical heat transfer analysis of transcritical hydrocarbon fuel flow in a tube partially filled with porous media

Numerical heat transfer analysis of transcritical hydrocarbon fuel flow in a tube partially filled with porous media

Using Porous Media to Enhancement of Heat Transfer in Heat Exchangers

Effect of an Inserted Porous Layer Located at a Wall of a Parallel Plate Channel on Forced Convection Heat Transfer

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