Heat and Mass Transfer between Impinging Gas Jets and Solid Surfaces

Martin, Holger

doi:10.1016/s0065-2717(08)70221-1

Cited by 1,363 publications

(679 citation statements)

References 27 publications

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“…This critical Reynolds number scales as Re D,min $ Ca 0.52 for h min = 500 nm with a slightly increasing exponent for lower h min . Since the jet pressure distribution P jet decays much faster [37][38][39][40]13] with distance from the nozzle than the shear stress distribution s jet , the two relevant components of Q y at the front rim are s y h 2 /(2l) and U sub h. From a balance of these terms and the approximate scaling s $ Re 2 D [13], the critical Reynolds number required to reach a certain minimum film thickness scales with ffiffiffiffiffiffiffiffiffi U sub p or Ca 0.5 in excellent agreement with Fig. 5a.…”

Section: Minimum Film Thickness H Minmentioning

confidence: 99%

“…Akatnov [43], Tsukker [44] and Glauert [37] derived a self-similar analytical solution for the wall-jet region [38] of a jet impinging on a solid wall. In the axisymmetric case [44,37], the wall shear stress at large distances from the impingement point scales as s jet -$ r À11/4 , whereas the stagnation pressure distribution P jet (r) decays rapidly [39,13] for distances exceeding D. We first consider the steady state height profile along the jet trajectory, i.e.…”

Section: Scaling Analysismentioning

confidence: 99%

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Deformation and dewetting of thin liquid films induced by moving gas jets

Berendsen

Zeegers

Darhuber

2013

Journal of Colloid and Interface Science

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Section: Minimum Film Thickness H Minmentioning

confidence: 99%

Section: Scaling Analysismentioning

confidence: 99%

Deformation and dewetting of thin liquid films induced by moving gas jets

Berendsen

Zeegers

Darhuber

2013

Journal of Colloid and Interface Science

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“…A review of frequently used correlations can be found, for example, in Viskanta (1993) for both single and multiple impinging jets. Another useful set of generic empirical correlations for a number of basic nozzle geometries has been collected and generalized by Martin (1977) on the basis of correlations published earlier by other workers.…”

Section: Introductionmentioning

confidence: 99%

Wall imprint of turbulent structures and heat transfer in multiple impinging jet arrays

Geers¹,

Hanjalić

Tummers

2005

J. Fluid Mech.

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Thermal imprint and heat transfer on the target surface in multiple impinging jet arrays have been investigated in conjunction with flow pattern and large-scale eddy structure. Surface temperature was measured with liquid crystal thermography (LCT) in a range of jet configurations with hexagonal and in-line orifice arrangements for different combinations of distances between the orifices s/D m = 2-6 and between the orifice plate and the impingement surface H/D m = 3-10 (where D m is the orifice diameter). The hexagonal arrangement was considered with two different orifice shapes: sharp-edged and contoured. For selected configurations, the distribution of Nusselt number and its peculiarities were analysed in relation with the underlying eddy structure educed by proper orthogonal decomposition (POD) of the snapshots of fluid velocity measured with particle image velocimetry (PIV). Owing to the breakdown of the jets, heat transfer deteriorates with increasing orifice-to-plate distance. The jet interaction and breakdown become more severe as the jets are placed closer to each other. The large-scale eddies originating from the jet-edge shear layers grow as they are convected towards the impingement plate. Eddies of sizes between 0.2 and 0.3 orifice diameters are shown to break up the jets and cause mixing of fresh and spent fluid, lowering the beneficial temperature gradient. In some configurations, an asymmetric flow pattern is generated with embedded weak eddies on only one side of the diagonal symmetry line, which is reflected in an asymmetrical heat transfer distribution on the impingement plate. For H/D m > 4, the Nusselt number shows peak values in and around the jet impingement centres, but relatively uniform distribution of turbulence kinetic energy with local negative energy production close to the impingement surface.

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“…Consequently, many studies have been conducted on the visualization, qualification and comprehension of jet flow structures and heat transfer. Martin [1], Jambunathan et al [2], Viskanta [3] and Zukerman and Lior [4] have reviewed a large panel of jet impingement studies. The most widely studied configuration is a single jet issuing from a long tube or from a contraction nozzle.…”

Section: Introductionmentioning

confidence: 99%

“…Considering the Newton's law of cooling: ( 1 ) With ϕ conv , the convective heat flux density on the impinged side, T w , the wall temperature and T ref , the reference temperature. The method consists in prescribing different convective heat flux densities ϕ conv and in measuring the wall temperature T w at a given location of the impinged plate for each.…”

mentioning

confidence: 99%