Fast transient spray cooling of a hot thick target

Tenzer, Fabian; Roisman, Ilia V.

doi:10.1017/jfm.2019.743

Cited by 36 publications

(29 citation statements)

References 37 publications

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“…16(b), compared to the smooth surface, the CHF and HTC were enhanced by 59% to 180 W/cm 2 and 42% to 3 W/cm 2 K, respectively, and the cooling efficiency was 29.4%. Romashevskiy and Ovchinnicov [133] tested droplet evaporation on direct femtosecond laser processed surfaces that had hierarchical micronanostructures of micropatterns covered with flake-like nanostructures. These superhydrophilic surfaces could significantly accelerate droplet evaporation and increase the Leidenfrost temperature by 30 C. These surfaces have the potential to be applied in spray cooling.…”

Section: Hierarchical Structuresmentioning

confidence: 99%

Spray Cooling on Enhanced Surfaces: A Review of the Progress and Mechanisms

Wang

Jiang

2021

Journal of Electronic Packaging

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The rapid development of electronics, energy and propulsion systems has led us to the point where their performances are limited by cooling capacities. Heat fluxes of 10~100, even over 1,000 W/cm2 need to be dissipated with minimum coolant flow rate in next-generation power electronics. Spray cooling is a high heat flux, uniform and efficient cooling technique proven effective in various applications. However, its cooling capacity and efficiency need to be further improved to meet next-generation ultrahigh-power applications. Engineering of surface properties and structures can fundamentally affect the liquid-wall interactions, thus becoming the most promising way to enhance spray cooling. However, the unclear mechanisms of surface-enhanced spray cooling cause lack of guiding principles for surface design. Here, progress in spray cooling on surfaces with structures of different scales are reviewed and their performances evaluated and compared. Spray cooling can achieve critical heat flux (CHF) above 945 W/cm2 and heat transfer coefficient (HTC) up to 57 W/cm2K on structured surfaces for pressurized nozzle and CHF and HTC up to 1250 W/cm2 and 250 W/cm2K, respectively, on a smooth surface with the assistance of secondary gas flow. CHF enhancement of 110% was achieved on hybrid micro- and nanostructured surfaces. A clear map of enhancement mechanisms is proposed after analysis. Some future concerns are also proposed. This work helps the understanding and design of engineered surfaces in spray cooling and provides insights for interdisciplinary applications of heat transfer and advanced engineering materials.

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Section: Hierarchical Structuresmentioning

confidence: 99%

Spray Cooling on Enhanced Surfaces: A Review of the Progress and Mechanisms

Wang

Jiang

2021

Journal of Electronic Packaging

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“…Hot surface spray-cooling rate experiments of a small metal specimen show both the fundamental validity and limitation of the theory [29]. A typical temperature-time curves are provided which illustrates the relation between temperature and time observed during the cooling process.…”

Section: Validationmentioning

confidence: 86%

3D Transient Spray Cooling Heat Transfer Simulation for Metallic Slabs of Various Alloys

Elguerri¹,

Belfodil²,

Guerri³

et al. 2020

IJDNE

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Water spray cooling is widely used in many industrial processes to control the surface dissipation of a material ported at high temperatures. To predict heat transfer and obtain the rate of required temperature distributions of the surface, it is necessary to understand the basic spray cooling dynamics and a more precise estimation of the heat transfer rate. This paper is about a three-dimensional simulation to estimate the transient heat transfer obtained locally by water spray to reduce the temperature of heated metal. The use of water spraying is a practical and flexible process. It is possible to vary, in space, time, and in large proportions the flux of extracted heat and controls the density of the flow of water which is a key element and very simple to achieve. Globally, the aim of this study is to simulate the spray cooling of different metal slabs for various alloys (steel, cast iron, titanium, nickel) by mainly comparing cooling in maps of iso-surfaces and in curves (at starts and globally) obtained after estimation of the heat flux.

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“…In the case of spray or drop impact onto a hot substrate, the flow is influenced significantly by the microphysical thermodynamic processes caused by liquid evaporation and boiling [10,11]. The heat flux at the substrate interface during spray impact also depends significantly on the thermodynamic or hydrodynamic regime of the interaction.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of AdBlue Film Formation in a Generic SCR Test Bench and Numerical Analysis Using LES

et al. 2021

Self Cite

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In this work, an experimental investigation of AdBlue film formation in a generic selective catalytic reduction (SCR) exhaust gas test bench is presented. AdBlue is injected into a generic SCR test bench resulting in liquid film formation on the lower wall of the channel. The thickness of this liquid film is measured using a film thickness sensor based on absorption spectroscopy. Simultaneously, the wall temperature at the measurement point is monitored, which allows for examining correlations between the evolution of the film thickness and the temperature of the wetted wall. The velocity of the airflow in the channel and the initial wall temperature are varied in the experiments. Correspondingly, the measurements are performed during different thermodynamic regimes, including liquid film deposition and boiling. Repeated measurements have also shown that the film thicknesses are reproducible with a standard deviation of 3.4 %. LES-based numerical simulations are compared to the experimental results of the film thickness during the early injection stage. Finally, a numerical analysis is performed to analyze the AdBlue droplet impingement and subsequent film-formation dynamics.

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Fast transient spray cooling of a hot thick target

Cited by 36 publications

References 37 publications

Spray Cooling on Enhanced Surfaces: A Review of the Progress and Mechanisms

Spray Cooling on Enhanced Surfaces: A Review of the Progress and Mechanisms

3D Transient Spray Cooling Heat Transfer Simulation for Metallic Slabs of Various Alloys

Experimental Investigation of AdBlue Film Formation in a Generic SCR Test Bench and Numerical Analysis Using LES

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