An experimental investigation of free and submerged miniature liquid jet array impingement heat transfer

Robinson, A.J.; Schnitzler, Eduardo

doi:10.1016/j.expthermflusci.2006.12.006

Cited by 123 publications

(48 citation statements)

References 16 publications

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“…Similarly, for the free-surface jet configuration a fixed jet-to-target spacing of H/d n =20 has been used. Between approximately 15 ≤ H/d n ≤ 30 the jets can be considered fully unconfined and the heat transfer coefficient changes very little [23].…”

Section: Resultsmentioning

confidence: 99%

“…In order to keep the parametric range manageable whilst still providing enough range for comparisons, a fixed interjet spacing of S/d n =5 has been selected for all of the nozzle configurations studied. Further, for the confined submerged cases a fixed jet-to-target spacing of H/d n =2 is chosen since Robinson and Schnitzler [23] showed that for H/d n >3 the heat transfer tends to degrade sharply with increased jet-totarget spacing. Similarly, for the free-surface jet configuration a fixed jet-to-target spacing of H/d n =20 has been used.…”

Section: Resultsmentioning

confidence: 99%

“…The surface averaged heat transfer coefficient and pressure drop characteristics of impinging free-surface and confined-submerged water jet arrays have been Schnitzler [23] observed that, for submerged jets, the largest average heat transfer coefficients occurred in the region of 2 ≤ H/d n ≤ 3. Consequently, a value of H/d n = 2 was selected for the confined-submerged experiments in order to achieve the greatest possible heat transfer.…”

Section: Experimental Set-upmentioning

confidence: 99%

“…Further to this, few investigations on the influence of nozzle geometries deviating from the common straight, circular structure exist. This work is the natural progression of the works of Robinson and Schnitzler [23] and Royne and Dey [25] in which different inlet and/or outlet modifications are investigated with respect to the thermal-hydraulic performance of impinging liquid jet arrays. In particular, the use of state of the art 3D rapid prototyping allows for more complex geometrical configurations to be manufactured compared with previous works.…”

Section: Introductionmentioning

confidence: 99%

“…Robinson and Schnitzler [23] conducted experiments investigating the impingement of water jet arrays under both free-surface and submerged conditions. In this work a large population of jets was used which induces cross flow which is known to influence the heat transfer [24].…”

Section: Introductionmentioning

confidence: 99%

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Nozzle geometry effects in liquid jet array impingement

Whelan

Robinson

2009

Applied Thermal Engineering

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The use of impinging liquid jets in electronics thermal management is attracting some consideration due to their very high heat transfer coefficients, hot spot targeting capabilities and moderate hydraulic power requirements. In this investigation an experimental study of the cooling capabilities of impinging water jet arrays is presented. Of particular interest here is the influence that the inlet and outlet geometries have on the thermal-hydraulics of jet impingement heat transfer with the aim of determining practical configurations in which heat transfer to the impinging jets is increased and/or the hydraulic pumping power is decreased. For a square array of 45 jets of fixed 1.0 mm diameter and fixed interjet spacing of 5 mm, six different nozzle geometries were investigated. The arrays impinged normally upon a heated circular copper surface of 31.5 mm diameter for a nominal heat flux of 25.66 W/cm2. Each array was tested under confined-submerged flow conditions with a constant jet-to-target spacing of 2.0 mm as well as free-surface conditions with a constant jet-to-target spacing of 20 mm. All nozzles were tested for a Reynolds number range of approximately 800 ≤ Redn ≤ 10000. It has been found that the confined-submerged tests yield greater heat transfer coefficients compared with their free jet counterparts. Chamfering and contouring the nozzle inlets showed significant decrease in the pressure drop across the nozzle plate whilst chamfering and contouring the exit showed moderate gains in the surface averaged heat transfer coefficient. Nozzles that provide the highest heat transfer for a given hydraulic pumping power are identified for each free-surface and confined-submerged scenarios. Chamfering and contouring the nozzle inlets showed significant decrease in the pressure drop across the nozzle plate whilst chamfering and contouring the exit showed moderate gains in the surface averaged heat transfer coefficient. Nozzles that provide the highest heat transfer for a given hydraulic pumping power are identified for each free-surface and confined-submerged scenarios. Nozzle Geometry Effects in Liquid Jet

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Experimental Set-upmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Nozzle geometry effects in liquid jet array impingement

Whelan

Robinson

2009

Applied Thermal Engineering

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Flow structures and heat transfer characteristics in arrays of submerged laminar impinging jets

Rohlfs

Bieber

Ehrenpreis

et al. 2016

Proc Appl Math and Mech

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This study summarizes the scaling behavior of single laminar submerged jets with circular and planar cross sections. Unified correlations for the stagnation zone heat transfer of both configurations, based on the dominant dimensionless numbers, are presented. In technical applications, impinging jets are often applied in jet array configurations. Compared to single jet impingement, jet-to-jet interaction can have a substantial influence on local heat transfer. A distinct pattern of the heat transfer coefficient was observed experimentally. Numerical simulations revealed two counter-rotating vortices in the interaction zone between two jets to be the causing mechanism of this pattern.

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