Numerical Flow and Heat Transfer Under Impinging Jets: A Review

Polat, S.; Huang, Bo‐Wei; Mujumdar, Arun S.; Douglas, W. J. M.

doi:10.1615/annualrevheattransfer.v2.60

Cited by 191 publications

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“…Several reviews have been published on the subject aimed at summarizing the latest developments in impingement technology, measurement technique, and numerical computations. Among these are, for example, the works of Martin [3], Polat et al [4], Han and Goldstein [5], Viskanta [6], or a more recent contribution by Weigand and Spring [7]. Among the variety of impingement configurations, those for the cooling in turbomachinery differ from those for other components in terms of the dimensionless quantities involved.…”

Section: Introductionmentioning

confidence: 99%

An Experimental and Numerical Study of Heat Transfer From Arrays of Impinging Jets With Surface Ribs

Spring

Xing

Weigand

2012

Journal of Heat Transfer

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A combined experimental and numerical investigation of the heat transfer characteristics within arrays of impinging jets with rib-roughened surfaces is presented. Two configurations are considered: One with an inline arrangement of jets and ribs oriented perpendicular to the direction of cross-flow and one with a staggered arrangement of jets and broken ribs aligned with the direction of cross-flow. For both cases, the jet Reynolds number is 35,000, the separation distance measures H/D ¼ 3, the spent air is routed through one exit contributing to the maximum cross-flow condition, and the rib height and width is both 1 D. The experiments are carried out in perspex models using the transient liquid crystal method. Local jet temperatures are measured at several positions on the impingement plate to account for an exact evaluation of the heat transfer coefficient. In addition to the measurements, a numerical analysis using the commercial CFD software package ANSYS CFX is conducted. Heat transfer predictions are compared with those obtained from experiments with regards to local distributions as well as averaged quantities. A good overall agreement is found but discrepancies for local values need to be accepted. The present investigation also emphasizes that configurations including rib roughness elements should be compared based on the amount of transferred heat flux in order to account for the area enlarging effect. This allows a correct evaluation of the thermal performance.

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Section: Introductionmentioning

confidence: 99%

An Experimental and Numerical Study of Heat Transfer From Arrays of Impinging Jets With Surface Ribs

Spring

Xing

Weigand

2012

Journal of Heat Transfer

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“…A few studies reviewed heat transfer of impingement jets and their applications (Polat et al, 1989), (Jones and Launder, 1972). In this study, we concentrate on works related to liquid impingement jets and their applications for cooling and heating in recent years.…”

Section: Introductionmentioning

confidence: 99%

Investigation of heat transfer processes involved liquid impingement jets: a review

Molana

Banooni

2013

Braz. J. Chem. Eng.

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“…Martin [5] also conducted a review of jet impingement heat transfer for a wider range of parameters that included jet arrays, confinement and submergence. Polat et al [6] presented a review of numerical investigations that have been conducted in the area of convective heat transfer to impinging jets. Comprehensive studies of the mean fluid flow characteristics of both free and impinging jets have also been presented by Donaldson and Snedeker [7], Beltaos [8] and Martin [5].…”

Section: Introductionmentioning

confidence: 99%

Jets

2006

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Convective heat transfer to an impinging air jet is known to yield high local and area averaged heat transfer coefficients. Such jets are of interest in the cooling of electronic components and of turbine blades and in manufacturing processes such as grinding. The current research is concerned with the measurement of heat transfer to impinging air jets over a wide range of test parameters. These include Reynolds numbers, Re, from 10000 to 30000, nozzle to impingement surface distance, H\D, from 0.5 to 8 and angle of impingement, , from 30° to 90° (normal impingement). The current research reports both mean and fluctuating heat transfer distributions up to 6 diameters from the geometric centre of the jet. The heat transfer results are compared to local velocity data. Spectral and coherence information is also reported for simultaneous velocity and heat flux measurement.At low nozzle to impingement surface spacings the heat transfer distributions exhibit secondary peaks at a radial location that varies with both Re and H\D. These peaks are shown to be due to an abrupt increase in turbulence in the wall jet boundary layer. At certain test configurations vortices that initiate in the shear layer impinge on the surface and move along the wall jet before being broken down into smaller scale turbulence. This vortical characteristic of an impinging air jet has also been shown to vary considerably with the angle of impingement; depending on the distance between the near nozzle edge and the impingement surface, vortices at different stages of development will impact with the target surface.

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Numerical Flow and Heat Transfer Under Impinging Jets: A Review

Cited by 191 publications

References 0 publications

An Experimental and Numerical Study of Heat Transfer From Arrays of Impinging Jets With Surface Ribs

An Experimental and Numerical Study of Heat Transfer From Arrays of Impinging Jets With Surface Ribs

Investigation of heat transfer processes involved liquid impingement jets: a review

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