Arrays of Impinging Jets With Spent Fluid Removal Through Vent Holes on the Target Surface, Part 2: Local Heat Transfer

Hollworth, B. R.; Lehmann, G.; Rosiczkowski, J.

doi:10.1115/1.3227428

Cited by 63 publications

(19 citation statements)

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“…Hollworth and Dagan (1980), and Hollworth et al (1983) varied jet Reynolds number and jet-to-jet spacing of square arrays on jet walls containing the effusion holes and found that staggered jet arrays with respect to effusion hole arrays on target walls out perform inline configurations for non-rotating target wall heat transfer. Andrews et al (1988) studied non-rotating impingement and effusion cooling individually and in combination.…”

Section: Direction Of Rotationmentioning

confidence: 99%

Rotation Effect on Jet Impingement Heat Transfer in Smooth Rectangular Channels with Film Coolant Extraction

Parsons

Han

1999

International Journal of Rotating Machinery

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The effect of channel rotation on jet impingement cooling by arrays of circular jets in twin channels was studied. Impinging jet flows were in the direction of rotation in one channel and opposite to the direction of rotation in the other channel. The jets impinged normally on the smooth, heated target wall in each channel. The spent air exited the channels through extraction holes in each target wall, which eliminates cross flow on other jets. Jet rotation numbers and jet Reynolds numbers varied from 0.0 to 0.0028 and 5000 to 10,000, respectively. For the target walls with jet flow in the direction of rotation (or opposite to the direction of rotation), as rotation number increases heat transfer decreases up to 25% (or 15%) as compared to corresponding results for non-rotating conditions. This is due to the changes in flow distribution and rotation induced Coriolis and centrifugal forces.

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Section: Direction Of Rotationmentioning

confidence: 99%

Rotation Effect on Jet Impingement Heat Transfer in Smooth Rectangular Channels with Film Coolant Extraction

Parsons

Han

1999

International Journal of Rotating Machinery

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“…However, very few studies are available on a combined cooled one. Hollworth and Dangan (1980) and Hollworth and Lehmann (1983) reported perhaps the first investigations on the jets impinging on a flat surface, with the spent fluid removed through film holes from the target surface. Jet holes and the film holes had the same diameters, and the spacing of the jet holes was twice that of the film holes.…”

Section: Introductionmentioning

confidence: 98%

Computational Investigations of Flow and Heat Transfer on an Effused Concave Surface with a Single Row of Impinging Jets for Different exit Configurations

Kumar

Prasad

2009

Engineering Applications of Computational Fluid Mechanics

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A computational study is reported on flow and heat transfer from a single row of circular air jets impinging on a concave surface with either one or two rows of effusion holes or without effusion holes. The effects of arrangement of jet orifices and effusion holes, spent air exit closure configurations, H/D ratio and jet Reynolds number are investigated. The pressure distribution is higher for the configuration with the air exit only through effusion holes. At higher Reynolds number, three peaks in local Nusselt number are identified and explained. Among the cases tested, the configuration with a single row of inline effusion holes shows the least heat transfer and there is a significant local enhancement in heat transfer along the stagnation line for a single row of staggered effusion holes. However, the effect of arrangement is negligible for two rows of effusion holes. Among the configurations tested the case of one edge open exit configuration with a single row of staggered effusion holes (Case-C1s) shows higher heat transfer among others.

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“…Hollworth et al [1,2] investigated the average heat transfer of array impingement jets with fluid removal through vent holes. Ekkad et al [3] studied the effect of outlet position on the heat transfer of impingement with film outflow.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigations of a double‐decker jet impingement/film structure's cooling effectiveness

Zhen-xiong

Mao

Wen³

et al. 2008

Heat Trans. Asian Res.

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Experiments were carried out to investigate the cooling coefficient of a laminar double-decker jet impingement/film structure. Blowing rate M, the ratio of the jet impingement distance to the diameter of the jet hole H/D, the ratio of the distance between the jet hole and film hole to the diameter of the jet hole P/D were changed to study the rules of local cooling coefficient varying with these parameters. All the results show that a higher cooling coefficient was achieved under larger blowing rate conditions. There exists a proper range of H/D and P/D, which can result in a maximum cooling coefficient. It is verified that when H/D = 0.5 and P/D = 4, the maximum cooling coefficient can be achieved.

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Arrays of Impinging Jets With Spent Fluid Removal Through Vent Holes on the Target Surface, Part 2: Local Heat Transfer

Cited by 63 publications

References 0 publications

Rotation Effect on Jet Impingement Heat Transfer in Smooth Rectangular Channels with Film Coolant Extraction

Rotation Effect on Jet Impingement Heat Transfer in Smooth Rectangular Channels with Film Coolant Extraction

Computational Investigations of Flow and Heat Transfer on an Effused Concave Surface with a Single Row of Impinging Jets for Different exit Configurations

Experimental investigations of a double‐decker jet impingement/film structure's cooling effectiveness

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