Local and average transfer coefficients due to an impinging row of jets

Koopman, R. N.; Sparrow, E. M.

doi:10.1016/0017-9310(76)90051-x

Cited by 56 publications

(28 citation statements)

References 7 publications

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“…These can, however, be explained by considering the influence of turbulence. Koopman and Sparrow [9] experimentally studied the effect of a row of impinging jets on plane surface on the local and average heat transfer coefficients. They showed relatively high local heat transfer coefficient in the mid-way between the neighboring jets due to the collision of the spreading flows from nearby jets.…”

Section: Experimental Studies On Impinging Flowsmentioning

confidence: 99%

Flow and thermal characteristics of jet impingement: comprehensive review

Shukla¹,

Dewan²

2017

IJHT

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A comprehensive review on jet impingement heat transfer is presented to consider the state-of the art in this field. Among all the single-phase heat transfer arrangements possible, it has the maximum heat transfer rate. A number of arrangements are possible to represent a practical or physical situation, such as, jet impingement on a solid flat surface or surface fitted with different kinds of turbulent promoters, inclined plane surface and cylindrical convex/concave surface, etc. A significant number of papers dealing with experimental and computational studies on different physical and computational aspects of jet impinging flows are reviewed. Several parameters were found to influence the characteristics, such as, flow confinement, nozzle shape, jet to plate spacing and Reynolds number. An extremely small number of studies dealing with application based jet impingement heat transfer configurations (e.g., ribs fitted impingement plate, moving impingement plate, etc) experimentally and numerically have been reported in the literature. Various computational approaches, such as, RANS, LES, DNS and hybrid models, that are used to study the jet impingement heat transfer, with their complexities and boundary conditions, have been reviewed. It was observed that majority of RANS based turbulence models did not predict impinging flows accurately and its complexities except a few. Many authors have reported that LES is capable of predicting the flow field and heat transfer data within the accepted accuracy limits. DNS can be applied to simple geometry with low Reynolds number. Recently some authors have employed hybrid models, such as, PANS, DES, etc., and concluded that these models provide reasonably accurate results and were found to be computationally less expensive than LES and DNS.

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Section: Experimental Studies On Impinging Flowsmentioning

confidence: 99%

Flow and thermal characteristics of jet impingement: comprehensive review

Shukla¹,

Dewan²

2017

IJHT

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“…Lee and Vafai [28] developed a procedure to determine the optimal separation distance and nozzle-to-nozzle spacing for an impinging jet-array using the previous experimental results [3,11,21,23,29]. The maximum convective capability of an impinging jet-array is significantly affected by the manner of treating the spent flow [28].…”

Section: Introductionmentioning

confidence: 97%

“…There are fundamental differences in the fluid mechanics between single and multiple impinging-jets due to the jet-to-jet interactions prior to and after their impingement on the surface. The factors those influence heat transfers of impinging jet-arrays include turbulence [2], entrainment [3], nozzle geometry [4][5][6], separation distance [1][2][3][4][5][6], jet incidence angle [7], surface condition of impinging plate [8][9][10], wall-jet interaction [11][12][13][14][15][16][17], jet spacing [18] and external factors such as the crossflow [19][20][21][22][23], spent flow condition [24,25], drainage [26,12] and jet pulsation [27]. The impacts of these factors on heat transfer are generally described as functions of separation distance and jet Reynolds number for a set of geometrical specifications.…”

Section: Introductionmentioning

confidence: 99%

Heat transfer of impinging jet-array over convex-dimpled surface

Chang

Jan

Chang

2006

International Journal of Heat and Mass Transfer

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“…It is concluded that there is relation between the subatmospheric regions and peaks in heat transfer coefficients for low spacing in the impinging jets. Koopman and Sparrow [10] studied a row of impinging air jets and concluded that a higher local heat transfer coefficient was obtained in the middle between adjacent jets owing to the collision of their spreading flows. Chander and Ray [11] conducted an experimental study for three interacting methane/air flame jets (arranged in a triangular configuration) impinging normally on a flat surface.…”

Section: Introductionmentioning

confidence: 98%

“…Their results show that the maximum local Nusselt number and maximum pressure on the impingement surface move downstream while the inclination angle was increasing. Koopman [7] obtained high heat transfer coefficients for multiple jets in the stagnation region and at the second stagnation point (the midpoint between the two neighboring jets). An experimental study was carried out by Kwok et al [8] to investigate the shape and the heat transfer characteristics of an array of three laminar pre-mixed butane/air slot flame jets impinging upwards normally on a horizontal watercooled flat plate.…”

Section: Introductionmentioning

confidence: 99%