Dynamic pressure based prediction of spray cooling heat transfer coefficients

Abbasi, Bahman; Kim, Jungho; Marshall, André W.

doi:10.1016/j.ijmultiphaseflow.2010.01.007

Cited by 43 publications

(9 citation statements)

References 17 publications

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“…On this account, when the surface temperature is high, the peak droplet flux impingement may not occur at the surface centre due to the expanded spray cone even the spray height is 25 mm. From the surface temperature distributions, it could be inferred that the droplets impingement is the primary heat transfer mechanism in the-non boiling regime of spray cooling as suggested in the previous studies [8,9]. …”

Section: Surface Temperature Distributionmentioning

confidence: 56%

Characterization of spray atomization and heat transfer for a swirl nozzle

Jinlong¹,

Zhao²,

Duan³

et al. 2012

REPQJ

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Abstract.Spray cooling, a high heat flux thermal management, has received great attention from modern industrial and technological applications, such as power electronics, high-power lasers, and conversion systems etc. The focus of the present work is to investigate the spray characteristics and heat transfer of a swirl nozzle under a low pressure drop range. An open loop spray cooling system is developed to examine the heat transfer performance of the swirl nozzle by considering the effects of nozzle pressure drop, impinged spray height. A Phase Doppler Anemometry (PDA) system is applied to characterize the droplet Sauter Mean diameter, droplet velocity, spray angle, and spray pattern. It is found that the swirl nozzle under lower pressure drop helps to generate a full cone spray with a smaller spray angle, while the higher pressure drop produces better atomization quality. The heat transfer experimental results indicate that the droplet impingement is the primary cooling mechanism in the nonboiling regime of spray cooling, and increasing the pressure drop generally improves the heat transfer performance.

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Section: Surface Temperature Distributionmentioning

confidence: 56%

Characterization of spray atomization and heat transfer for a swirl nozzle

Jinlong¹,

Zhao²,

Duan³

et al. 2012

REPQJ

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“…Mean droplet diameter, mean droplet velocity and volumetric flux are the main hydrodynamic parameters that influence the spray-cooling performance. Many heat transfer correlations based on Nusselt number and heat transfer coefficient were developed for single-phase spray cooling [177][178][179][180]. In the nucleate boiling regime, homogeneous nucleation, thin film evaporation and secondary nucleation were reported as the main mechanisms for phase-change heat transfer.…”

Section: Spray Coolingmentioning

confidence: 99%

Hybrid Nanofluids—Next-Generation Fluids for Spray-Cooling-Based Thermal Management of High-Heat-Flux Devices

Asim

Siddiqui

2022

Nanomaterials

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In recent years, technical advancements in high-heat-flux devices (such as high power density and increased output performance) have led to immense heat dissipation levels that may not be addressed by traditional thermal fluids. High-heat-flux devices generally dissipate heat in a range of 100–1000 W/cm2 and are used in various applications, such as data centers, electric vehicles, microelectronics, X-ray machines, super-computers, avionics, rocket nozzles and laser diodes. Despite several benefits offered by efficient spray-cooling systems, such as uniform cooling, no hotspot formation, low thermal contact resistance and high heat transfer rates, they may not fully address heat dissipation challenges in modern high-heat-flux devices due to the limited cooling capacity of existing thermal fluids (such as water and dielectric fluids). Therefore, in this review, a detailed perspective is presented on fundamental hydrothermal properties, along with the heat and mass transfer characteristics of the next-generation thermal fluid, that is, the hybrid nanofluid. At the end of this review, the spray-cooling potential of the hybrid nanofluid for thermal management of high-heat-flux devices is presented.

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“…In the former method, a specimen is heated by a controlled heat source while simultaneously a quenchant flow removes heat from the specimen to reach an equilibrium temperature. This case is mainly found when quenching using sprays, see for example references [3][4][5][6]. Abbasi et al [3] used an electric resistance to supply heat to a metallic sample that simultaneously received a water spray to reach an equilibrium temperature.…”

Section: Boiling and Quenching Heat Transfermentioning

confidence: 99%

A Review of the Boiling Curve with Reference to Steel Quenching

Barrena-Rodríguez

Acosta-González

Tellez-Rosas

2021

Metals

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This review presents an analysis and discussion about heat transfer phenomena during quenching solid steel from high temperatures. It is shown a description of the boiling curve and the most used methods to characterize heat transfer when using liquid quenchants. The present work points out and criticizes important aspects that are frequently poorly attended in the technical literature about determination and use of the boiling curve and/or the respective heat transfer coefficient for modeling solid phase transformations in metals. Points to review include: effect of initial workpiece temperature on the boiling curve, fluid velocity specification to correlate with heat flux, and the importance of coupling between heat conduction in the workpiece and convection boiling to determine the wall heat flux. Finally, research opportunities in this field are suggested to improve current knowledge and extend quenching modeling accuracy to complex workpieces.

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Dynamic pressure based prediction of spray cooling heat transfer coefficients

Cited by 43 publications

References 17 publications

Characterization of spray atomization and heat transfer for a swirl nozzle

Characterization of spray atomization and heat transfer for a swirl nozzle

Hybrid Nanofluids—Next-Generation Fluids for Spray-Cooling-Based Thermal Management of High-Heat-Flux Devices

A Review of the Boiling Curve with Reference to Steel Quenching

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