Jet impingement heat transfer from lobed nozzles

Martin, Roland; Buchlin, Jean‐Marie

doi:10.1016/j.ijthermalsci.2011.02.017

Cited by 51 publications

(7 citation statements)

References 37 publications

(45 reference statements)

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“…Such an enhancement was shown to result from the different spreading rates along the minor and major axis plane. A multichannel configuration (Ianiro and Cardone, 2011) and lobed nozzles (Herrero Martin and Buchlin, 2011) are also examples of nozzle configurations that lead to enhanced heat transfer properties.…”

Section: Introductionmentioning

confidence: 99%

Three-dimensional vortex dynamics and convective heat transfer in circular and chevron impinging jets

Violato

Ianiro

Cardone

et al. 2012

International Journal of Heat and Fluid Flow

121

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Section: Introductionmentioning

confidence: 99%

Three-dimensional vortex dynamics and convective heat transfer in circular and chevron impinging jets

Violato

Ianiro

Cardone

et al. 2012

International Journal of Heat and Fluid Flow

121

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“…Note that Jordan et al's test was carried out on a single jet and that Singh et al used multiple jets for maximum crossflow condition with plenum chamber effect. There have been many other investigations on some exotic jet impingement hole shapes, e.g., chevron [23] and lobe [87], where the above analysis could not be carried out due to the absence of pressure drop or discharge coefficient data.…”

Section: Thermal-hydraulic Performance Of Shaped Jetsmentioning

confidence: 99%

Opportunities in Jet-Impingement Cooling for Gas-Turbine Engines

Dutta

Singh

2021

Energies

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Impingement heat transfer is considered one of the most effective cooling technologies that yield high localized convective heat transfer coefficients. This paper studies different configurable parameters involved in jet impingement cooling such as, exit orifice shape, crossflow regulation, target surface modification, spent air reuse, impingement channel modification, jet pulsation, and other techniques to understand which of them are critical and how these heat-transfer-enhancement concepts work. The aim of this paper is to excite the thermal sciences community of this efficient cooling technique and instill some thoughts for future innovations. New orifice shapes are becoming feasible due to innovative 3D printing technologies. However, the orifice shape variations show that it is hard to beat a sharp-edged round orifice in heat transfer coefficient, but it comes with a higher pressure drop across the orifice. Any attempt to streamline the hole shape indicated a drop in the Nusselt number, thus giving the designer some control over thermal budgeting of a component. Reduction in crossflow has been attempted with channel modifications. The use of high-porosity conductive foam in the impingement space has shown marked improvement in heat transfer performance. A list of possible research topics based on this discussion is provided in the conclusion.

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“…A comparison between circular and elliptical nozzle shapes conducted by Keenan et al showed an increased heat transfer rate for short stand-off distances [18]. Lobed geometries have also received considerable attention [19] [20]. One of the efforts has been made experimentally by Martin et al, who introduced two-lobed geometries operating at Reynolds number of 10,000 to 50,000 [20].…”

Section: Introductionmentioning

confidence: 99%

Heat Transfer and Crossflow Investigations for Jet Impingement Cooling Applications

Salem,

Soliman,

Amano

2024

JGPP

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Jet impingement is widely used in different cooling applications. The accumulation of crossflow as the spent air migrates downstream causes a decay in the overall cooling performance. This study aims to mitigate the undesirable crossflow effects by attaching the so-called-crossflow diverters. Cylindrical, rectangular, and ribbed diverter shapes are numerically studied within a 25-jet array for a range of Rej of up to 10,000. Diverter heights of 3 mm (QL), 6 mm (HL), and 9 mm (TQL), as a percentage of jet-to-target spacing (12 mm) are considered with a constant heat flux condition. Results show an increased Nu from 6.6% to 12%. However, the associated friction factor is also increased by 9.9% -24.3% on average compared to the baseline model. Consequently, results show a net enhancement of up to 5.2%, 3.1%, and 3.8% for cylindrical, rectangular, and ribbed-type diverters, respectively according to the heat transfer performance parameter (η).

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Jet impingement heat transfer from lobed nozzles

Cited by 51 publications

References 37 publications

Three-dimensional vortex dynamics and convective heat transfer in circular and chevron impinging jets

Three-dimensional vortex dynamics and convective heat transfer in circular and chevron impinging jets

Opportunities in Jet-Impingement Cooling for Gas-Turbine Engines

Heat Transfer and Crossflow Investigations for Jet Impingement Cooling Applications

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