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界面现象 及传热
ESCI SJR: 0.258 SNIP: 0.574 CiteScore™: 0.8

ISSN 打印: 2169-2785
ISSN 在线: 2167-857X

界面现象 及传热

DOI: 10.1615/InterfacPhenomHeatTransfer.2019030188
pages 437-449

BOILING MICROJET IMPINGING COOLING AT SUBATMOSPHERIC PRESSURES: VISUALIZATION AND HEAT TRANSFER CHARACTERISTICS

Gollu Divakar Naidu
Department of Mechanical Engineering, Indian Institute of Technology Kanpur, Kanpur (UP) 208016, India
Sameer Khandekar
Department of Mechanical Engineering, Indian Institute of Technology Kanpur, Kanpur (UP) 208016, India

ABSTRACT

Liquid jet impingement is an attractive option for thermal management because of its efficiency in removing high heat fluxes. In order to take advantage of the superior thermophysical properties of water and the low wall temperatures possible at low saturation operating pressures, an experimental setup was developed to study and visualize single and two-phase jet impingement cooling on a heated flat aluminum surface (diameter = 10 mm), using a micro-sized water jet (481.2 μm) at flow Reynolds numbers Re = 2186, 3499, and 4374. The jet inlet subcooling was varied from ° to 25°C and the nozzle-to-surface distance was 5.0 mm. The process was carried out under single-component phase-change regime at subatmospheric pressures of 0.095 and 0.180 bar, respectively (corresponding to Tsat = 45°C and 58°C), such that boiling is intrinsically maintained at low wall temperatures. Boiling curves, i.e., heat flux versus wall superheats, were obtained and the influence of jet velocity and subcooling on the heat transfer is reported. Jet inlet velocity and subcooling were found to have a large influence during single-phase convection, where higher Reynolds numbers and higher subcooling resulted in lower wall temperatures. In the fully developed nucleate boiling phase, subcooling was found to have a marginal effect, while jet velocity had practically no influence with respect to the wall superheat at identical heat flux levels. The high-speed visualization studies presented in this paper provided an excellent understanding of the trends observed in the heat transfer data. The heat transfer coefficients range from 15 to 40 kW/m2 · K, while critical heat flux was attained in the range of 140–168 W/cm2 at surface temperatures close to sin 75°C.

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