Technical Note The effect of concave surface curvature on heat transfer from a fully developed round impinging jet

Lee, D.H.; Chung, Y.S.; Won, Se Youl

doi:10.1016/s0017-9310(98)00318-4

Cited by 93 publications

(43 citation statements)

References 11 publications

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“…The pressure coefficient and the Nusselt number distribution with SST k-ω turbulence model along the curvature (refer Fig. 3) shows that there is a good agreement between the computational results and the experimental data [16]. Hence the present computational methodology with SST k-ω turbulence model can be well taken as validated for impinging jet on curved surface.…”

Section: Validationsupporting

confidence: 61%

“…In order to find the validity of using the SST k-ω turbulence model for predicting the flow and heat transfer characteristics of jet impinging on a curved surface, a case with single jet impinging on concave surface is selected. The computational model selected for validating the present numerical methodology mimics the experimental set-up of Lee et al [16] so that the computational results can be compared with the experimental data [16]. The pressure coefficient and the Nusselt number distribution with SST k-ω turbulence model along the curvature (refer Fig.…”

Section: Validationmentioning

confidence: 99%

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Computational Investigations of Impingement Heat Transfer on an Effused Concave Surface

Kumar¹,

Prasad²

2012

International Journal of Fluid Machinery and Systems

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A computational study is reported on flow and heat transfer characteristics from five rows of circular air jets impinging on a concave surface with four rows of effusion holes. The effects of exit configurations of spent air and the arrangement of jet orifices and effusion holes for a jet Reynolds number of 7500 is investigated. In all, eight cases are studied and a good qualitative correlation is found among their flow patterns, pressure variations and heat transfer distributions

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Section: Validationsupporting

confidence: 61%

Section: Validationmentioning

confidence: 99%

Computational Investigations of Impingement Heat Transfer on an Effused Concave Surface

Kumar¹,

Prasad²

2012

International Journal of Fluid Machinery and Systems

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“…An interesting view of the effects of curvature was presented: the concavity effect similar to the comprehensions of Lee et al [14] and Gau and Chung [15] could enhance the heat transfer, resulting in an increased local Nusselt number near the stagnation point at higher curvatures, however, comparing with the flat plate case, the confinement effect would reduce the heat transfer and result in a lower Nusselt number. Öztekin et al investigated the hydrodynamics and heat transfer characteristics of slot jet impingement on a concave surface [18,19].…”

Section: Introductionmentioning

confidence: 90%

“…The average heat transfer rates for impingement on the concave surface were found to be much higher than that on the flat plate, which was attributed to the effect of curvature. In the same year, the effect of concave surface curvature on round impinging jet was studied by Lee et al [14], showing that Nusselt numbers at both the stagnation point and wall jet region increased with increasing surface curvature. The thinning of the boundary layer and the generation of Taylor-Görtler vortices might be the reasons responsible for such an enhancement.…”

Section: Introductionmentioning

confidence: 99%

Experimental study of jet impingement heat transfer on a variable-curvature concave surface in a wing leading edge

Peng

Lin

et al. 2015

International Journal of Heat and Mass Transfer

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Abstract:In this paper, extensive experimental investigation of the heat transfer characteristics of jet impingement on a variable-curvature concave surface in a wing leading edge was conducted for aircraft anti-icing applications. The experiments were carried out over a wide range of parameters: the jet Reynolds number, Rej, from 51021 to 85340, the relative tube-to-surface distance, H/d, from 1.736 to 19.76, and the circumferential angle of jet holes on the piccolo tube, , from -60° to 60°. In addition, jet impingements with single one, two and three rows of aligned jet holes were all investigated. Experimental results revealed the effects of various parameters on the performance and characteristics of jet impingement heat transfer in the specific structure adopted here, and our insufficient understanding on the corresponding physical mechanism was presented. It was found that the jet impingement heat transfer performance was enhanced with the increase of jet Reynolds number.For single one row of jet holes, an optimal H/d of 4.5 was determined under Rej = 51021 and d = 2mm, for which the jet impingement achieved the best heat transfer performance. For two and three rows of aligned jet holes, the Nux curves in the chordwise direction exhibited much different shapes due to different intensity of the interference between adjacent air jets. This work contributes to a better understanding of the jet impingement heat transfer on a concave surface in a wing leading edge, which can lead to optimal design of the aircraft anti-icing system.

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“…As an effective measure to enhance the local heat transfer coefficient, it has been applied in a wide variety of fields, such as glass tempering, metal annealing, food and paper drying, and gas turbine blade and electronics cooling [1][2][3][4][5]. Because jet impingement is a very complex heat and mass transfer process, which is influenced by many parameters such as the shape and size of the nozzle, the nozzle layout, the nozzle to target surface distance, the jet Reynolds number, the impingement angle and the curvature of impinging surface, comprehensive experimental and theoretical studies have been conducted especially for jet impingement on a flat or cylindrical surface [6][7][8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Jet impingement heat transfer on a concave surface in a wing leading edge: Experimental study and correlation development

Peng

Lin

et al. 2016

Experimental Thermal and Fluid Science

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Extensive experimental studies of the heat transfer characteristics of jet impingement on a variable-curvature concave surface in a wing leading edge were conducted for aircraft anti-icing applications. The experiments were performed on a piccolo tube with three rows of aligned jet holes over a wide range of parameters: the jet Reynolds number (Rej) from 50,000 to 90,000, the relative tube-to-surface distance (H/d) from 1.74 to 20.0, the jet impingement angle ( ) from 66° to 90°, and the relative chordwise arc length in the jet impingement zone (r/d) from 13.2 to 34.8. The experimental results indicated that the heat transfer performance at the stagnation point was enhanced with increasing Rej and , and an optimal H/d existed to achieve the best heat transfer performance at the stagnation point. It was found that the attenuation coefficient curve of the jet impingement heat transfer in the chordwise direction exhibited an approximate bell shape with the peak located at the stagnation point, affected only by r/d in the peak zone. In the non-peak zone, however it was affected significantly by a variety of factors including Rej, H/d and r/d. Experimental data-based correlations of the Nusselt number at the stagnation point and the distribution of the attenuation coefficient in the chordwise direction were developed and validated, which can be used to predict the performance of a wing leading edge anti-icing system.

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Technical Note The effect of concave surface curvature on heat transfer from a fully developed round impinging jet

Cited by 93 publications

References 11 publications

Computational Investigations of Impingement Heat Transfer on an Effused Concave Surface

Computational Investigations of Impingement Heat Transfer on an Effused Concave Surface

Experimental study of jet impingement heat transfer on a variable-curvature concave surface in a wing leading edge

Jet impingement heat transfer on a concave surface in a wing leading edge: Experimental study and correlation development

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