The effect of inclination on the heat transfer between a flat surface and an impinging two-dimensional air jet

Beitelmal, Abdlmonem H.; Saad, Michel A.; Patel, Chandrakant D.

doi:10.1016/s0142-727x(99)00080-6

Cited by 137 publications

(57 citation statements)

References 10 publications

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“…This variation of stagnation point displacement from the geometric centre is illustrated in figure 3 (b). In an investigation reported by Beitelmal et al (21), the displacement of the stagnation point was found to be independent of Reynolds number. Heat transfer distributions for a jet impinging at a range of oblique angles are presented in figure 4 (a) and (b) for normalised jet to surface spacings of H/D = 2 and H/D = 6 respectively.…”

Section: Time-averaged Fluid Flow and Heat Transfer Measurementsmentioning

confidence: 84%

Fluctuating fluid flow and heat transfer of an obliquely impinging air jet

O’Donovan

Murray

2008

International Journal of Heat and Mass Transfer

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Heat transfer to an obliquely impinging air jet is investigated experimentally. Distributions of the mean and the fluctuating component of the surface heat transfer are reported for a jet Reynolds number of 10000, nozzle to impingement surface distance, H/D, from 2 to 8 and angle of impingement, α, from 30 • to 90 • (normal impingement). Flow velocity measurements along the impingement surface are related to heat transfer distributions. At specific locations the surface heat transfer and the local fluid velocity are measured simultaneously and coherence and phase difference information between the signals are reported. The vortical characteristic of the flow is 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 impact with the target surface. The influence of naturally occurring vortices in an impinging jet flow on the magnitude of heat transfer in the near wall jet is reported.

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Section: Time-averaged Fluid Flow and Heat Transfer Measurementsmentioning

confidence: 84%

Fluctuating fluid flow and heat transfer of an obliquely impinging air jet

O’Donovan

Murray

2008

International Journal of Heat and Mass Transfer

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“…Similarly, Kim et al (1997) used an inflow oscillation to increase the hear transfer, finding a particular frequency for the maximum heat transfer enhancement. Unsteady flow, impinging jets have also been used to remove localised heat loads in electronics package (Beitelmal et al, 2000;Chung et al, 2001a;Chung et al, 2002).…”

Section: Introductionmentioning

confidence: 99%

Unsteady laminar flow and convective heat transfer in a sharp 180° bend

Chung

Tucker

Roychowdhury

2003

International Journal of Heat and Fluid Flow

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“…The interaction between the main vortices and the topmost flat plate (confinement plate) determined a second series of vortexes (upper adverse vortexes). The experimental heat transfer study of single confined impinging jets, inclined slot nozzle impinging jets, and influence of Prandtl number were carried out by Jung-Yang et al [2], Beitelmal et al [3], and ChinYuan and Suresh [4] respectively. In numerical turbulent studies of impinging jets, although more costly Reynolds stress model due to taking into account turbulence anisotropy effects leads to more satisfactory results than eddy viscosity models (Morris et al [5]) however satisfactory modelling of the heat transfer rate on impinging surface depends mostly on the near wall turbulence modelling (Craft et al [6]).…”

Section: Figurementioning

confidence: 99%

Numerical heat transfer modelling of staggered array impinging jets

Ramezanpour¹,

Mirzaee²,

Rahmani³

et al. 2006

Advanced Computational Methods in Heat Transfer IX

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A numerical study of flow field and heat transfer rate in external flow of a novel heat exchanger (Anglia Ruskin University, 2001) was conducted. The design comprises of confined impinging jets from a staggered bundle of tubes in which the fluid flows in an opposite staggered arrangement array after impingement. The RNG k-ε model and enhanced wall treatment near wall turbulence modelling was applied to model a three-dimensional computational domain. The accuracy of the model was validated in two-and three-dimensional cases for single impinging jets with available experimental results. The arrangement of the staggered array was fixed S n /D=2.1 and S p /D=1.6 where S n and S p are the distances between tubes transverse and parallel to fluid flow respectively and D was the hydraulic diameter of tubes. The dimensionless tubes to impinging surface distance (H/D) were in the range of 0.2, 0.5, 1.0, and 2.0 and the Reynolds number based on the tubes' hydraulic diameter and average fluid velocity at the exit of tubes in the range of 1000, 5000, and 20000 were studied. The global heat transfer rate on both impinging and confinement plates increased with decreasing of H/D and increasing of Reynolds number; however, the slope of increasing Reynolds number was sharper in low H/Ds. The friction factor increased with a decreasing H/D and an increasing of the Reynolds number. The local Nusselt number was studied on both impinging and confinement plates. The temperature contours and velocity vectors are also presented.

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The effect of inclination on the heat transfer between a flat surface and an impinging two-dimensional air jet

Cited by 137 publications

References 10 publications

Fluctuating fluid flow and heat transfer of an obliquely impinging air jet

Fluctuating fluid flow and heat transfer of an obliquely impinging air jet

Unsteady laminar flow and convective heat transfer in a sharp 180° bend

Numerical heat transfer modelling of staggered array impinging jets

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