Experimental investigation of convective heat transfer in an open-cell aluminum foams

Hamadouche, A.; Nebbali, Rachid; Benahmed, H.; Kouidri, Ahmed; Bousri, A.

doi:10.1016/j.expthermflusci.2015.10.009

Cited by 56 publications

(17 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Figure 2 shows the pressure drops of all OCFs structures measured at different superficial velocities, together with the theoretical estimations. As reported by several Authors [51][52][53], Forchheimer-extended Darcy equation is a valid model for describing the pressure drop in OCFs at fluid velocity higher than 0.1 m•s −1 . In the proposed model, the pressure drop per unit length (∆P/L) is expressed as a quadratic function of the inlet gas velocity (u) by the following equation: The terms a and b represent the viscous drag and the inertial drag, respectively [48,54,55].…”

Section: Geometrical Properties Of Ocfs Structuresmentioning

confidence: 52%

“…It can be expressed as the ratio between the dynamic viscosity of the fluid (µ) and the permeability of the foam (K). The second term (b = ρ•C), representing the quadratic dependence of the pressure drop on flow velocity, can be determined from the product of fluid density (ρ) and the form coefficient of the foam (C) [53,54,56].…”

Section: Geometrical Properties Of Ocfs Structuresmentioning

confidence: 99%

See 1 more Smart Citation

Rh/CeO2 Thin Catalytic Layer Deposition on Alumina Foams: Catalytic Performance and Controlling Regimes in Biogas Reforming Processes

et al. 2018

View full text Add to dashboard Cite

: The application of ceramic foams as structured catalyst supports is clearly expanding due to faster mass/heat transfer and higher contact efficiency than honeycomb monoliths and, mainly, packed beds. In this paper, alumina open-cell foams (OCFs) with different pore density (20, 30 and 40 ppi) were coated with Rh/CeO2 catalyst via a two steps synthesis method involving: (i) the solution combustion synthesis (SCS) to in-situ deposit the CeO2 carrier and (ii) the wet impregnation (WI) of the Rh active phase. The catalytic coatings were characterized in terms of morphology and adhesion properties by SEM/EDX analysis and ultrasounds test. Permeability and form coefficient were derived from pressure drop data. Catalytic performance was evaluated towards biogas Steam Reforming (SR) and Oxy-Steam Reforming (OSR) processes at atmospheric pressure by varying temperature (800–900 °C) and space velocity (35,000–140,000 NmL·g−1·h−1). Characteristics time analysis and dimensionless numbers were calculated to identify the controlling regime. Stability tests were performed for both SR and OSR over 200 h of time-on-stream (TOS) through consecutive start-up and shut-down cycles. As a result, homogenous, thin and high-resistance catalytic layers were in situ deposited on foam struts. All structured catalysts showed high activity, following the order 20 ppi < 30 ppi ≈ 40 ppi. External interphase (gas-solid) and external diffusion can be improved by reducing the pore diameter of the OCF structures. Anderson criterion revealed the absence of internal heat transfer resistances, as well as Damköhler and Weisz-Prater numbers excluded any internal mass transfer controlling regime, mainly due to thin coating thickness provided by the SCS method. Good stability was observed over 200 h of TOS for both SR and OSR processes.

show abstract

Section: Geometrical Properties Of Ocfs Structuresmentioning

confidence: 52%

Section: Geometrical Properties Of Ocfs Structuresmentioning

confidence: 99%

Rh/CeO2 Thin Catalytic Layer Deposition on Alumina Foams: Catalytic Performance and Controlling Regimes in Biogas Reforming Processes

et al. 2018

View full text Add to dashboard Cite

show abstract

“…Hence, the pressure drop determined by the application of the Forchheimer equation can be characterized by a relatively high error if fluid is pumped through the foam with a considerable velocity. The reports in [6,7,12] suggest that the Forchheimer equation does not find application when the fluid velocity exceeds 10 m/s. Pressure drop during flow through metal foams can be derived on the basis of the Ergun equation.…”

Section: Introductionmentioning

confidence: 99%

Influence of flow conditions and foam parameters on pressure drop and heat transfer in flow of fluids through channels filled with metal foams

2018

View full text Add to dashboard Cite

This paper reports the results of research into air, water and oil flow through pipes filled with open-cell metal foams, which form a material with a considerable potential for application in the design of process equipment. This study applied three metal foams with various geometrical parameters. The objective of the experiments involved the measurement of pressure drop within a relatively large range of the variability of the flow conditions. On the basis of data from the literature and analysis of the results of experiments, an assessment was undertaken concerned with the influence of the geometrical parameters of the foams as well as velocities and fluid properties on the flow regime and pressure drop. The results demonstrate that the theory concerned with the fluid flow through porous media has a limited application with regard to metal foams due to the considerable turbulence of the flow through such foams. If flow occurs in other conditions than laminar regime, the permeability of metal foams is relative not only to the geometrical structure of the foams but also depends on the properties and velocity of the fluid. The present study demonstrated that the assessment of the flow regime can apply the modified Reynolds number in which the characteristics dimension is defined on the basis of the parameters accounting for the geometrical foam structure. Three flow regimes were distinguished – laminar flow, transient Forchheimer and transient Froud flow. The ranges corresponding to the occurrence of the particular flow regimes were subsequently determined.

show abstract

“…A local thermal non-equilibrium model is another research interest [25][26][27]. Besides, there is experimental research about heat transfer of air or water in ducts or channels with porous inserts or ribs [28][29][30][31].…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2016

View full text Add to dashboard Cite

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.

show abstract

Experimental investigation of convective heat transfer in an open-cell aluminum foams

Cited by 56 publications

References 11 publications

Rh/CeO2 Thin Catalytic Layer Deposition on Alumina Foams: Catalytic Performance and Controlling Regimes in Biogas Reforming Processes

Rh/CeO2 Thin Catalytic Layer Deposition on Alumina Foams: Catalytic Performance and Controlling Regimes in Biogas Reforming Processes

Influence of flow conditions and foam parameters on pressure drop and heat transfer in flow of fluids through channels filled with metal foams

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

Contact Info

Product

Resources

About