Heat Transfer during Flow Boiling of Water in Short Microchannel with High Aspect Ratio

• Published in: Journal of engineering thermophysics 2021-04, Vol.30 (2), p.200-206
• Main Authors: Shamirzaev, A. S., Mordovskoi, A. S., Kuznetsov, V. V.
• Format: Article
• Language: English
• Subjects: Fluid- and Aerodynamics; Flux density; Heat flux; Heat transfer; High aspect ratio; Microchannels; Nanoparticles; Physics; Physics and Astronomy; Side heating; Thermodynamics
• ISSN: 1810-2328; 1990-5432
• DOI: 10.1134/S181023282102003X

The paper presents results of experimental research on the influence of the mass flux on the heat transfer during flow boiling of subcooled de-ionized water in conditions of three-side heating in a system of two microchannels with an aspect ratio of 13.3. The horizontal experimental section was a copper block with two microchannels 2 mm wide, 0.15 mm deep, and 16 mm long; the inner surface of the microchannels was covered with a thin layer of nickel with hydrophilic nanoparticles of Aerosil 200. The mass flux varied from 500 to 3500 kg/m extsuperscript2s; the initial water subcooling relative to the saturation temperature at the microchannel outlet was 80°C. The dependence of the superheat of the wall on the heat flux density was determined; the critical heat fluxes were measured; comparison of the obtained data with calculation based on the binomial equation for subcooled boiling in a microchannel was carried out.