Flow characteristics and heat transfer performances of a semi-confined impinging array of jets: effect of nozzle geometry

Dano, Bertrand P. E.; Liburdy, James A.; Kanokjaruvijit, Koonlaya

doi:10.1016/j.ijheatmasstransfer.2004.07.046

Cited by 77 publications

(19 citation statements)

References 28 publications

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“…The comparisons are based on the stagnation values. Jet spacing values (X/d, Y/d) of 4,6,8,12, and 16, jet-to-plate spacings (H/d) varying from 2 to 5, and Reynolds numbers ranging from 10,000 to 30,000 have been investigated. They concluded that the optimum jet-to-jet spacing for the H/d of 2 is 8; the optimum jet-to-jet spacing for the H/d of 3 is 12; and the optimum jet-to-jet spacing for the H/d of 5 is 6.…”

Section: Introductionmentioning

confidence: 99%

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Optimum Jet-to-Plate Spacing of Inline Impingement Heat Transfer for Different Crossflow Schemes

Xing

2013

Journal of Heat Transfer

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A nine-by-nine jet array impinging on a flat plate at Reynolds numbers from 15,000 to 35,000 has been studied by the transient liquid crystal method. The spacing between the impingement plate and target plate is adjusted to be 1, 2, 3, 4, and 5 jet diameters. The effect of jet-to-plate spacing has been investigated for three jet-induced crossflow schemes, referred as minimum, medium, and maximum crossflow, correspondingly. The local air jet temperature is measured at several positions on the impingement plate to account for an appropriate reference temperature of the heat transfer coefficient. The jetto-plate spacing, H/d ¼ 3, is found to be better than the others for all the crossflow schemes. Jet-to-plate spacings H/d ¼ 1 and H/d ¼ 2 result in a sudden decrease in the stagnation zone. The large jet-to-plate spacings H/d ¼ 4 and H/d ¼ 5 could not provide higher heat transfer performance with higher crossflow.

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Section: Introductionmentioning

confidence: 99%

“…He found that the jet-to-plate spacing H/d is optimum at a value of 3. Dano et al [12] studied the effect of nozzle geometry on the heat transfer performances of a semiconfined impinging jets array. The results showed that the averaged Nusselt numbers decrease with increasing jet-to-plate spacing when 1 H/d 4.…”

Section: Introductionmentioning

confidence: 99%

Optimum Jet-to-Plate Spacing of Inline Impingement Heat Transfer for Different Crossflow Schemes

Xing

2013

Journal of Heat Transfer

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“…The structural exit cross-section of the jet gives varied flow patterns of the jet, which has an effect on cooling ability. It is also true that its practical use is dependent on ease in manufacturing of the jet [18][19][20]. It is observed that slot jet and circular jets are used regularly due to their simplicity in manufacturing and applications.…”

Section: Jet Impingement Reviewmentioning

confidence: 99%

Cold Zone Exploration Using Position of Maximum Nusselt Number for Inclined Air Jet Cooling

Ingole

Sundaram

2017

Archive of Mechanical Engineering

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Inclined jet air cooling can be effectively used for cooling of electronics or other such applications. The non-confined air jet is impinged and experimentally investigated on the hot target surface to be cooled, which is placed horizontally. Analysis and evaluations are made by introduction of a jet on the leading edge and investigated for downhill side cooling to identify cold spots. The jet Reynolds number in the range of 2000 ≤ Re ≤ 20 000 is examined with a circular jet for inclination (Θ) of 15 < Θ < 75 degree. Also, the consequence of a jet to target distance (H) is explored in the range 0:5 ≤ H/D ≤ 6.8. For 45 degree jet impingement, the maximum Nusselt number is widely spread. Location of maximum Nusselt number is studied, which indicates cold spots identification. At a higher angle ratio, the angle is the dominating parameter compared to the Reynolds Number. Whereas at a lower angle ratio, the inclined jet with a higher Reynolds number is giving the cooling point away from leading edge. It is observed that for a particular angle of incident location of maximum Nusselt Number, measured from leading edge of target, is ahead than that of stagnation point in stated conditions.

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“…In the downstream area, the center of an impingement jet was shifted and the shapes of fluid flow on the impinging surface become irregular. Dano et al [10]determined the flow behavior of impinging surfaces by digital particle image velocimetry(DPIV) and flow visualization techniques. The results show that the heat transfer rate was maximum at the stagnation point, and the peak of the heat transfer coefficient was decayed along the cross-flow direction.…”

Section: Introductionmentioning

confidence: 99%

Effects of Different Orifice Structure on Heat Transfer Characteristics of Steel Strip Surface in an Air Impinging Freezer

Liu¹,

Wang²,

Xie³

2018

dtcse

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Abstract. In this paper, the fluid field in an air impinging freezing experimental table was studied by computational fluid dynamics (CFD) numerical simulation technology. The influence of the different diameter D and orifice spacing distance S on the heat transfer characteristics on the steel strip surface were analyzed, and the difference of the heat transfer effect between the orifice and slit nozzle were compared. The results show that when the orifice diameter is less, the heat transfer coefficient on the steel strip surface is less due to the effect of cross-flow. With the orifice diameter is increased, the effect of the resistance along the upstream is increased. The average Nusselt number on the steel strip surface is the highest at D=10mm. When the spacing distance is less, the distance between the first row of orifice nozzle in the upstream and the adhering wall is less and the velocity of flow is less. With the increased of spacing distance, the distance between the first row of orifice nozzle in the upstream and the last in the downstream is increased, and the effect of cross-flow is increased. The average Nusselt number on the steel strip surface is the highest at S=34mm.The effect of cross-flow under the slit nozzles is weak and the food can be better protected. The average Nusselt number on the steel strip surface under the orifice nozzles is 9.7% higher than that of the slit nozzle.

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Flow characteristics and heat transfer performances of a semi-confined impinging array of jets: effect of nozzle geometry

Cited by 77 publications

References 28 publications

Optimum Jet-to-Plate Spacing of Inline Impingement Heat Transfer for Different Crossflow Schemes

Optimum Jet-to-Plate Spacing of Inline Impingement Heat Transfer for Different Crossflow Schemes

Cold Zone Exploration Using Position of Maximum Nusselt Number for Inclined Air Jet Cooling

Effects of Different Orifice Structure on Heat Transfer Characteristics of Steel Strip Surface in an Air Impinging Freezer

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