Experimental study of fluid flow behaviour and pressure drop in channels partially filled with metal foams

Anuar, Fadhilah Shikh; Abdi, Iman Ashtiani; Odabaee, Mostafa; Hooman, Kamel

doi:10.1016/j.expthermflusci.2018.07.032

Cited by 28 publications

(9 citation statements)

References 29 publications

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“…Fig. 10 shows a comparison of pressure drop between our simulation with experimental data 3) , where the pressure drop increases with the increases of the blockage ratio as expected. The pressure drop of a more porous structure like 30 PPI is larger than 10 PPI, which is obviously seen in higher blockage ratio of 0.13 and 0.39.…”

Section: Resultssupporting

confidence: 64%

“…Since the last decade, the metal foam studies have adapted the classical model of porous media (e.g., Darcy's Law 1) ), and its improved version, the development of Darcy to turbulence can be found in past work by Lage 2) . Even though the studies on fully filled metal foam heat exchanger designs are matured enough, there are limited studies on the partially filled designs, especially through the experimental work 3) . It is understandable that experimental study is tedious work and difficult 4) , while the computational fluid dynamics (CFD) method is more common and a faster approach to study fluid dynamics, for example, to predict flow near a surface 5) and in a large space 6) .…”

Section: Introductionmentioning

confidence: 99%

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Numerical and Experimental Study of Flow Behaviours in Porous Structure of Aluminium Metal Foam

Narasimmanaidu¹,

Anuar²,

Saat³

et al. 2021

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This study conducted a simulation and an experimental study on a channel that was partly filled with open-cell metal foam block. Different blockage ratios have been considered, where the foam height could occupy more than half of the channel size. The aim is to investigate the flow behaviours across the complicated structure of the porous medium. Results show that the use of Ergun and Forchheimer models showed a similar stagnant region and recirculation zone in the partially filled channel, which agreed with the experimental results. However, the deviation in pressure drop performance at a high blockage ratio is noticeable.

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Section: Resultssupporting

confidence: 64%

Section: Introductionmentioning

confidence: 99%

Numerical and Experimental Study of Flow Behaviours in Porous Structure of Aluminium Metal Foam

Narasimmanaidu¹,

Anuar²,

Saat³

et al. 2021

Evergreen

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“…The results from the 2D Slice method (hereon abbreviated as 2.D.S) also mirror this general trend, albeit with slightly greater detail. These results are in line with the observations of Anuar et al (2018) [10], observing that as flow passes through the tortuous internal geometry of the foam it undergoes significant losses, and because of this will be at its lowest momentum when it exits through the foam-freestream interface. It was then observed that the point after which the flow exits the foam is effectively solid, preventing further penetration.…”

Section: Velocity Contours and Streamlinessupporting

confidence: 92%

“…To allow for comparison with the velocity charts produced by Anuar et al [10], the normalised velocity in the x direction (i.e. / ) was plotted against the normalised height ( / ) for the cases shown in Sections 4.1.1 -4.1.2 above.…”

Section: Velocity Chartsmentioning

confidence: 99%

“…Normalised Velocity-Normalised Height Chart -30 PPI, h/H = 0.39, 6.2 m/s (a: Volume Averaged; b: 2D Slice) Normalised Velocity-Normalised Height Chart -30 PPI, h/H = 0.39, 3.9 m/s (a: Volume Averaged; b: 2D Slice) Normalised Velocity-Normalised Height Chart -30 PPI, h/H = 0.13, 6.2 m/s (a: Volume Averaged; b: 2D Slice) Normalised Velocity-Normalised Height Chart -30 PPI, h/H = 0.13, 3.9 m/s (a: Volume Averaged; b: 2D Slice) Normalised Velocity-Normalised Height Chart -10 PPI, h/H = 0.39, 6.2 m/s (a: Volume Averaged; b: 2D Slice) Normalised Velocity-Normalised Height Chart -10 PPI, h/H = 0.39, 3.9 m/s (a: Volume Averaged; b: 2D Slice) Normalised Velocity-Normalised Height Chart -10 PPI, h/H = 0.13, 6.2 m/s (a: Volume Averaged; b: 2D Slice) Normalised Velocity-Normalised Height Chart -10 PPI, h/H = 0.13, 3.9 m/s (a: Volume Averaged; b: 2D Slice)4.3 Pressure DropUsing CFD-Post, the pressure differential between the inlet and outlet of the channel was then calculated. This was then divided by the foam length to allow for comparison with the experimental pressure drop chart shown by Anuar et al[10]. The results are shown below inFigure 33. a) b) Pressure Drop Comparison: Volume Averaged vs 2D Slice vs Experimental 5.…”

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Browne¹

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With increased public awareness, and tightening restrictions on vehicle emissions, significant research has been completed into developing EGR Coolers for diesel engines that are less susceptible to particulate fouling. One such solution is the use of an open cell foam heat exchanger, which has shown promising results in numerous studies. In these studies however, flow phenomena unique to open cell foams has been observed, concluding that further research into these flow behaviours should be completed before product implementation. Due to the long experiment times and expensive imaging equipment associated with this however, the high cost often restricts further testing. This thesis was aimed at providing a monetarily and numerically inexpensive method to predict the flow behaviours through foam samples of varying pore density and spacing. To achieve this, two different simulations methods were employed using ANSYS Fluent 18.2, one using a volume averaged approach, and the other using a simplified 2dimensional representation of the foam ligaments, the "2D Slice" method. The results from this were compared to existing experimental data, showing that both methods could successfully reproduce experimental trends, and predict within reasonable accuracy flow velocities and pressure drops. For high pore densities both methods produced roughly equivalent results, however the more computationally intensive 2D slice method showed significant benefits for low pore density samples. Through analysis of these results, several areas for further improvement were recommended, and recommendations made for how these simulations could form the foundations for future, more complex work. ρ Density (kg/m 3)

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Compact potential of exhaust heat exchangers for engine waste heat recovery using metal foams

et al. 2019

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Summary To improve the practicability of the waste heat recovery system for internal combustion engines, the compact potential of exhaust heat exchangers using metal foams is investigated. In the present study, the performance of compact exhaust heat exchangers is compared with that of a conventional shell and tube heat exchanger in a real test bench. Both heat transfer and pressure drop performance are considered when assessing the performance of heat exchangers because these two factors normally show a trade‐off relationship when designing exhaust heat exchangers. Compared with the conventional heat exchanger, the compact heat exchanger can achieve a similar pressure drop, and at the same time the heat transfer is increased by 30%, whereas the volume and the weight are each reduced by 2/3. The performance of compact heat exchangers with six types of Ni metal foams is also investigated under different mass flow rates and thicknesses of the porous layer. Results show that the optimum compact heat exchanger enhances the comprehensive performance 1.9 times compared with original one. This study shows that metal foams have great potential in realizing a compact exhaust heat exchanger for engine waste heat recovery.

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Experimental study of fluid flow behaviour and pressure drop in channels partially filled with metal foams

Cited by 28 publications

References 29 publications

Numerical and Experimental Study of Flow Behaviours in Porous Structure of Aluminium Metal Foam

Numerical and Experimental Study of Flow Behaviours in Porous Structure of Aluminium Metal Foam

UQ eSpace

Compact potential of exhaust heat exchangers for engine waste heat recovery using metal foams

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