Role of Laminar Length of Round Jet Impinging on Metal Foams

Kuang, J. J.; Wang, X. L.; Lu, Tian Jian; Kim, T

doi:10.2514/1.t4567

Cited by 11 publications

(4 citation statements)

References 48 publications

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“…The axial length of the area without any mixing is represented by the laminar length. The radius of the jet is almost identical to the nozzle radius in this area [23]. The jet begins to mix with the surrounding fluid after the laminar length has passed, and the jet's radius gradually grows as well.…”

Section: A General Observationsmentioning

confidence: 77%

Injection into a viscoplastic medium : an experimental study

Mousavi,

Hassanzadeh,

Akbari

et al. 2023

Progress in Canadian Mechanical Engineering. Volume 6

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Jets and microjets play multiple roles in various engineering applications and numerous natural phenomena. In the current research, we conducted experimental investigations to deepen our understanding of the fundamental aspects of microjet injection into viscoplastic media and the transition from jet to microjet. Specifically, we have explored the influence of the injection velocity, nozzle diameter, and ambient fluid properties on the laminar length (i.e., the length of the stable region of the jet after injection from the nozzle) and penetration depth (i.e., the maximum depth into the ambient fluid that the jet fluid can spread in the axial direction) of the jets and microjets. In order to more fully grasp the fluid dynamics, we have identified and analyzed the governing dimensionless parameters, including the Reynolds and Bingham numbers. Our findings reveal that the laminar length and the penetration depth are a function of both the Reynolds and Bingham numbers. Also, an increase in the Reynolds number leads to a corresponding increase in the penetration depth.

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Section: A General Observationsmentioning

confidence: 77%

Injection into a viscoplastic medium : an experimental study

Mousavi,

Hassanzadeh,

Akbari

et al. 2023

Progress in Canadian Mechanical Engineering. Volume 6

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“…X L wang et el. find out the relations between the laminar and turbulent flows and effective heat transfer in the presence of metal foam [4]. Hycak et al [5] highlight about the experimental and numerical investigation of heat transfer through IJF..…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of effects of convective heat transfer and thermal performance of impinging jet on a metal plate with porous media

Khoso,

Fareedi,

Khan

et al. 2024

J. Phys.: Conf. Ser.

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This experimental investigation is aimed to evaluate the effects of convective heat transfer phenomena in an aluminium metal flat disc/plate placed below metal foam using a single round jet of air impinging in a confined region. The Jet impingement technique contains pressurized air, which is configured for certain specific application. It is designed to spray the fluid with the help of a nozzle on the surface of the disc or plate which is being heated or is being cooled. To understand the heat transfer phenomena in a metal plate with metal foams facing round air jet impingement; three metal foams of similar geometries but of different porosities and permeabilities are taken for study. Each experiment is performed with seven different flow rates and at two different heights with two different heat flux values. The recorded measurements are temperatures, pressure differences, flow rates, resistance voltages and currents, and time. The outcomes of the experimental data are analysed and compared results of all four distinct kinds of metal foams with different jet to plate height and at different heat fluxes. It is concluded that heat transfer efficiency may or may not increase depending upon the metal foam used. Overall, the conclusions are extremely useful in engineering.

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“…Most of the papers found in the literature concern theoretical modelling [2,[4][5][6][7][8][9], experimental measurements [1,[10][11][12][13][14], or both [15][16][17][18][19][20][21] on metallic or polymeric foams, used to enhance or reduce heat transfer in heat exchangers. Some of them are reviews of this subject [2,[22][23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

“…The latter resulted in being the most important factor. Kuang et al [13] measured the heat transfer convection coefficient in different flow regimes and concluded that a characteristic length is the major factor influencing it. Hong et al [5] analytically evaluated the border effects in the free convection of a heated vertical wall covered by metallic foam: these effects are meaningful only for high porosity foams.…”

Section: Introductionmentioning

confidence: 99%

Experimental Tests of Conduction/Convection Heat Transfer in Very High Porosity Foams with Lattice Structures, Immersed in Different Fluids

et al. 2023

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This experimental work presents the results of measurements of thermal conductivity λ and convection heat transfer coefficient h on regular structure PLA and aluminium foams with low density ratio (~0.15), carried out with a TCP (thermal conductivity probe), built by the authors’ laboratory. Measurements were performed with two fluids, water and air: pure fluids, and samples with the PLA and aluminium foams immersed in both fluids have been tested. Four temperatures (10, 20, 30, 40 °C) and various temperature differences during the tests ΔT (between 0.35 and 9 °C) were applied. Also, tests in water mixed with 0.5% of a gel (agar agar) have been run in order to increase the water viscosity and to avoid convection starting. For these tests, at the end of the heating, the temperature of the probe reaches steady-state values, when all the thermal power supplied by the probe is transferred to the cooled cell wall; thermal conductivity was also evaluated through the guarded hot ring (GHR) method. A difference was found between the results of λ in steady-state and transient regimes, likely due to the difference of the sample volume interested by heating during the tests. Also, the effect of the temperature difference ΔT on the behaviour of the pure fluid and foams was outlined. The mutual effect of thermal conductivity and free convection heat transfer results in being extremely important to describe the behaviour of such kinds of composites when they are used to increase or to reduce the heat transfer, as heat conductors or insulators. Very few works are present in the literature about this subject, above all, ones regarding low-density regular structures.

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Role of Laminar Length of Round Jet Impinging on Metal Foams

Cited by 11 publications

References 48 publications

Injection into a viscoplastic medium : an experimental study

Injection into a viscoplastic medium : an experimental study

Experimental investigation of effects of convective heat transfer and thermal performance of impinging jet on a metal plate with porous media

Experimental Tests of Conduction/Convection Heat Transfer in Very High Porosity Foams with Lattice Structures, Immersed in Different Fluids

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