Hydrodynamically and thermally developing flow in a rectangular channel filled with a high porosity fiber and rotating about a parallel axis

Alhusseny, Ahmed; Turan, Ali; Nasser, Adel; Hidri, Faiza

doi:10.1016/j.icheatmasstransfer.2015.07.012

Cited by 15 publications

(6 citation statements)

References 23 publications

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“…Similarly, they have been proposed as an effective way to enhance the heat dissipated from heavy-duty electrical generators through filling their rotating cooling passages either fully or partially with open-cell metal foams [23][24][25]. The value of the this proposal was inspected by introducing an enhancement factor as the ratio of heat transported to the pumping power required, that is, Nu Re p in Àp e ðÞ =ρu 2 in , and comparing it with the corresponding values from a previous work regarding turbulent flow in a rotating clear channel [26], as shown in Figure 4 [25], where it was confirmed that the proposed enhancement is practically justified and efficient.…”

Section: Applicationsmentioning

confidence: 99%

High-Porosity Metal Foams: Potentials, Applications, and Formulations

Alhusseny

Nasser

Al-zurfi

2018

Porosity - Process, Technologies and Applications

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This chapter is aimed as a concise review, but well-focused on the potentials of what is known as "High-porosity metal foams," and hence, the practical applications where such promising media have been/can be employed successfully, particularly in the field of managing, recovering, dissipating, or enhancing heat transfer. Furthermore, an extensive comparison is conducted between the formulations presented so far for the geometrical and thermal characteristics concerning the heat and fluid flow in opencell metal foams.

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Section: Applicationsmentioning

confidence: 99%

High-Porosity Metal Foams: Potentials, Applications, and Formulations

Alhusseny

Nasser

Al-zurfi

2018

Porosity - Process, Technologies and Applications

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“…Jen and Yan 6 have analysed the developing flow and heat transfer through rectangular channel filled partially with porous medium. Similarly, Alhusseny et al 7 have studied characteristics of hydrodynamically and thermally developing flow through rectangular channel filled with high porosity metal foam. Some important studies in developing region are cited in various studies.…”

Section: Introductionmentioning

confidence: 99%

Thermally developing forced convection flow through porous concentric pipes annular duct

Ahmed

2021

Proceedings of the Institution of Mechanical Engineers, Part C:

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This article shows the thermally developing flow through concentric pipes annular sector duct by describing the Darcy Brinkman flow field. The cross sectional convection-diffusion terms are transformed in power law discretized form by integrating over the differential volume, whereas backward difference scheme is used in the axial direction of heat flow. With the help of semi implicit method for pressure linked equations-revised ( SIMPLE-R), we get the solution of the governing problem. The graphs of velocity profiles against R and average Nusselt number against axial distance are plotted for different values of Darcy number and geometrical configuration parameters. It has been pointed out that velocity and thermal entrance length decrease, when we decrease the value of Darcy number. By decreasing the cross section of the concentric pipes annular sector duct in the transverse direction, thermally fully developed flow region develops earlier.

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“…Also, their open-cell structure makes them less resistant to the fluids flowing through them, and hence, pressure drop across them is much less than it in the case of flow via packed beds or granular porous media. Therefore and due to their ability to meet the highly thermal demands with no excessive loss in pressure, open-cell metal foams have been utilised in heat exchangers [14], [15] besides internal cooling of both turbine blades [16] and the rotor windings of high-capacity electrical generators [17], [18], and [19]. Thus, it is not surprising to use them recently in double-pipe heat exchangers [20] and [21], where a substantial enhancement in the heat transfer performance has been acquired.…”

Section: Introductionmentioning

confidence: 99%

“…It was found that this proposal enhances the amount of heat transported between the solid and fluid phases, and hence, improves the overall efficiency of cooling process. More recently, Alhusseny and Turan [17] and Alhusseny et al [18] studied numerically the developing flow through a channel rotating in a parallel-mode and fully filled with high porosity metal foam, where effects of rotation, geometrical and thermal characteristics of the fiber used, channel aspect ratio, and thermal dispersion on heat transfer performance were investigated.…”

Section: Introductionmentioning

confidence: 99%

Rotating metal foam structures for performance enhancement of double-pipe heat exchangers

Alhusseny

Turan

Nasser

2017

International Journal of Heat and Mass Transfer

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In order to enhance the amount of heat transported in a double-pipe heat exchanger, a compound enhancement is proposed incorporating both active and passive methods. The first one is through introducing secondary flows in the vicinity of the conducting surface using metal foam guiding vanes, which are fixed obliquely and rotating coaxially to trap fluid particles while rotation and then force them to flow over the conducting surface. The other is via covering the conducting surface between the two pipes with a metal foam layer to improve the heat conductance across it. This proposal is examined numerically by studying the three-dimensional, steady, incompressible, and laminar convective fluid flow in a counter-flow double-pipe heat exchanger partially filled with high porosity metal foam and rotating coaxially. With regards to the influence of rotation, both the centrifugal buoyancy and Coriolis forces are considered in the current study. The generalised model is used to mathematically simulate the momentum equations in the porous regions. Moreover, thermal dispersion has been taken into account while considering that fluid and solid phases are in a local thermal non-equilibrium. Computations are performed for a wide range of design parameters influencing the performance achieved such as the operating conditions, the configuration of the guiding vanes utilized, and the geometrical and thermal characteristics of the metal foam utilised. The results are presented by means of the heat exchanger effectiveness, pressure drop, and the overall system performance. The current proposed design has effectively proved its potential to enhance the heat transported considerably in view of the significant savings in the pumping power required compared to the heat exchangers fully filled with metal foams. Furthermore, the data obtained reveal an obvious impact of the design parameters inspected on both the heat exchanged and the pressure loss; and hence, the overall performance obtained. Although the heat exchanger effectiveness can be improved considerably by manipulating the design factors, care must be taken to avoid unnecessary expenses resulted from potential increases in pressure drop. KEYWORDS: Heat Exchanger, Compound Enhancement, Metal Foams, Rotation, Overall PerformanceNomenclature asf solid-to-fluid interfacial specific surface area cp specific heat of fluid phase Cc cold stream heat-capacity rate Cc = ṁc cp,c Ch cold stream heat-capacity rate Ch = ṁh cp,h Cmin the smaller of the hot (Ch) and the cold (Cc) fluid-phase heat-capacity rates df fiber diameter dp pore diameter Da Darcy number, Da=K / Dh 2 Dh hydraulic diameter of the channel Di1, Di2 internal and external diameters of the inner annular tube Do1, Do2 internal and external diameters of the outer annular tube F inertial coefficient hsf solid-to-fluid interfacial specific heat transfer coefficient Hsf dimensionless solid-to-fluid interfacial specific heat transfer coefficient k thermal conductivity K permeability of the porous medium

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Hydrodynamically and thermally developing flow in a rectangular channel filled with a high porosity fiber and rotating about a parallel axis

Cited by 15 publications

References 23 publications

High-Porosity Metal Foams: Potentials, Applications, and Formulations

High-Porosity Metal Foams: Potentials, Applications, and Formulations

Thermally developing forced convection flow through porous concentric pipes annular duct

Rotating metal foam structures for performance enhancement of double-pipe heat exchangers

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