Heat transfer enhancement of ammonia spray cooling by surface modification

Wang, H.; Wu, Jiahao; Yang, Qiang; Zhu, Xun; Liu, Qiang

doi:10.1016/j.ijheatmasstransfer.2016.05.052

Cited by 28 publications

(8 citation statements)

References 48 publications

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“…Karwa and Stephan [4] found out the wetting front velocity increases as jet velocity increases while it is reducing as the wetting front moves radially to the circumferential area. Wang et al [5] reported that the rewetting temperature was not susceptible to the jet velocity, which is in congruence with results obtained by Lee and Shen [6]. The both articles suggested that the rewetting temperature was almost independent of v j ΔT sub .…”

Section: Introductionsupporting

confidence: 73%

Influence of surface roughness on heat transfer during quenching hot metals with different nozzles

2020

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The experimental work aims at investigating the influence of surface roughness on heat transfer by using different nozzles. Part of the rough surfaces are provided directly by the industry. These surfaces of casting products possess considerable roughness up to millimeters which can be either unstructured or with typical grooves in the casting direction. The understanding of its effect on cooling hot metals can help to shed light on the quenching process encountered in the industrial applications. This study will initially be carried out with individual nozzles, such as full cone and full jet nozzles, in order to identify the basic relations. Subsequently, a mold is also applied which can be regarded as a series of full jet nozzles. As for the experiments with mold, the plate is moving downwards with a preset velocity; meanwhile, the plate is fixed for experiments with full jet and full cone nozzle.

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Section: Introductionsupporting

confidence: 73%

Influence of surface roughness on heat transfer during quenching hot metals with different nozzles

2020

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“…They found that a balanced fluid height was a critical heat transfer factor and that variations in the flow rate, particle size, and coating thickness only showed their effects in the evaporative regime by influencing the balanced liquid height. The increase in the HTC on porous structured surfaces due to increased active nucleation sites has also been studied in other works [105][106][107]. The electroplated microporous coating is also applied in spray cooling.…”

Section: Coated Microporous Structuresmentioning

confidence: 95%

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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“…As seen from Figure , the surface of untreated EHP is continuous and smooth without any cracks and cavities. The surface of EHP treated for 2 hours shows uniform distributed isles with porous structure, and the surface of EHP treated for 4 hours shows un‐uniform distributed isles, larger and deeper passageways, this may be attributed to the F ions in the electrolyte continuous etching the surface of EHP with reactive time prolonging and the small pores became larger and deeper and even converge to form ravines.…”

Section: Resultsmentioning

confidence: 99%

New insights for phase-change immersion cooling enhancement of solar cells under high concentration ratios

et al. 2017

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Summary To answer how surface corrosion affects the heat transfer performance of phase‐change immersion cooling solar cells, electrochemical etching was used for substrate surface treatment of simulated dense‐array solar cells in this paper. Morphology, roughness, and wettability of treated surfaces were characterized by scanning electron microscope, atomic force microscope, and spreading area, respectively. A self‐running cooling system was developed to investigate the effect of surface treatment on self‐running characteristics and heat transfer performance under different ethanol inlet temperatures and concentration ratios. The results show that the surface treated for 2 hours owns higher wettability because of the honeycomb‐like porous structure. Lower ethanol flowing velocity obtained under lower ethanol inlet temperature with treated samples. The maximum declined degree in the wall superheating of 21.1% and the maximum enhancement in the heat transfer coefficient of 33.3% are obtained for sample treated for 2 hours because of its higher wettability and porosity structure. The results show that electrochemical etching on substrate surface can improve the phase‐change immersion cooling performance of solar cells.

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Heat transfer enhancement of ammonia spray cooling by surface modification

Cited by 28 publications

References 48 publications

Influence of surface roughness on heat transfer during quenching hot metals with different nozzles

Influence of surface roughness on heat transfer during quenching hot metals with different nozzles

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

New insights for phase-change immersion cooling enhancement of solar cells under high concentration ratios

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