The effect of surface renewal due to largescale eddies on jet impingement heat transfer

Kataoka, Kunio; Suguro, Masashi; Degawa, Hirohisa; Maruo, Kenji; Mihata, I.

doi:10.1016/0017-9310(87)90270-5

Cited by 189 publications

(46 citation statements)

References 27 publications

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“…They also demonstrated that the present of a small disturbance in the upstream free shear layer enhanced the heat transfer in the stagnation region. Kataoka et al (1987) showed the effects of surface renewal by large-scale eddies on the heat transfer of impinging jets. They explained that a secondary peak heat transfer occurs because of intermittent motions which entrain ambient fluid and break up the thermal boundary layer on the wall.…”

Section: Introductionmentioning

confidence: 99%

Heat Transfer Enhancement of Impinging Jet by Notched – Orifice Nozzle

Shakouchi¹,

Kito²

2012

An Overview of Heat Transfer Phenomena

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Section: Introductionmentioning

confidence: 99%

Heat Transfer Enhancement of Impinging Jet by Notched – Orifice Nozzle

Shakouchi¹,

Kito²

2012

An Overview of Heat Transfer Phenomena

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“…Therefore, many researchers have investigated the effects of nozzle configuration including non-circular nozzles to improve the heat transfer rate on the target plate and the mechanism of the turbulent heat transfer [1][2][3]. Viskanta [4] provided detailed reviews of impingement heat transfer.…”

Section: Introductionmentioning

confidence: 99%

Heat transfer characteristics for inclined twin-jet impingement

Kito¹,

Matsumoto²,

Shakouchi³

et al. 2012

Advanced Computational Methods and Experiments in Heat Transfer XII

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Determining the local heat transfer coefficient on a target surface is essential for many engineering applications. Numerous studies of the heat transfer and flow characteristics for jet impingement on surfaces have been published. However, few studies have been reported about the heat transfer characteristics of inclined, as opposed to perpendicular or normal, impinging jets. Further, few studies have been reported on twin impinging jets. In this study, local Nusselt number (Nu) distributions on the target plate were obtained for Re=5000 (based on the hydraulic diameter of the slot nozzle, D h ), the nozzle-to-plate spacing (H/D h =2), the nozzle-to-nozzle spacing (L/D h =3, 5 and 7) and various twin-jet angles (θ=0, 15, 30 and 45°). For θ=0°, two primary stagnation points having maximum Nu numbers appeared at the geometrical impingement points of the each jet. A secondary stagnation point occurs in the mid-point between jets at L/D h =5 and 7. However, the secondary stagnation disappeared at lower nozzle-to-nozzle spacing (L/D h =3) .The primary Nu peak shifts away from the geometrical impingement point and the value of the primary Nu peak decreased as the inclination angle increased. When two jets were inclined in the same direction, the decrease in the first peak was smaller than that in the second peak with the increasing angle of the jets. On the other hand, the values of both peaks' Nu were almost the same when two jets were inclined to face each other.

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“…Study on the effect of pulsating frequencies on the impingement heat transfer has been a focused of many researches in the past [1][2][3][4] . If enhanced heat transfer can be obtained by pulsing an air jet, a lot of savings can be made from efficient heating or cooling system which can lead to reduced costs.…”

Section: Introductionmentioning

confidence: 99%

Effect of Pulsating Circular Hot Air Jet Frequencies on Local and Average Nusselt Number

Zulkifli¹,

Sopian²,

Abdullah³

et al. 2008

American J. of Engineering and Applied Sciences

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Abstract:The study was carried out to determine the effect of pulsating frequencies on the local and average heat transfer characteristic of a heated circular air jet. The velocity profile of a heated circular pulsating air jet was measured in the first part of the study. The same set-up was used to measure the heat flux of the pulsating jet impinging on a wall. The heat flux of the heated air jet impinging on the plate was measured using a heat flux microsensor at different radial positions. Measurement of the heat flux was used to calculate the average and local Nusselt Number for different pulsating frequencies and at different flow Reynolds Number. The pulsating frequencies were between 10-80 Hz and the Reynolds number used were 16 000, 23 300 and 32 000. Results obtained show that the local Nusselt number calculated were higher at all radial position away from the stagnation point. The pulsed jet Nusselt number was higher than the average steady jet Nusselt number for all values of frequencies due to the higher localised heat transfer. The higher Nusselt number obtained at localized radial positions can be due to the higher instantaneous velocity as was shown from the velocity profile plotted in the first part of the experiment. Enhanced turbulence intensity found was due to the pulsed jet.

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The effect of surface renewal due to largescale eddies on jet impingement heat transfer

Cited by 189 publications

References 27 publications

Heat Transfer Enhancement of Impinging Jet by Notched – Orifice Nozzle

Heat Transfer Enhancement of Impinging Jet by Notched – Orifice Nozzle

Heat transfer characteristics for inclined twin-jet impingement

Effect of Pulsating Circular Hot Air Jet Frequencies on Local and Average Nusselt Number

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