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International Heat Transfer Conference 13
Graham de Vahl Davis (open in a new tab) School of Mechanical and Manufacturing Engineering, University of New South Wales, Kensington, NSW, Australia
Eddie Leonardi (open in a new tab) Computational Fluid Dynamics Research Laboratory, School of Mechanical and Manufacturing Engineering, The University of New South Wales, Sydney, Australia 2052

ISSN Online: 2377-424X

ISBN CD: 1-56700-226-9

ISBN Online: 1-56700-225-0

TRANSIENT CRITICAL HEAT FLUXES OF SUBCOOLED WATER FLOW BOILING IN A SHORT VERTICAL TUBE CAUSED BY EXPONENTIALLY INCREASING HEAT INPUTS

page 13
DOI: 10.1615/IHTC13.p28.70
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Краткое описание

The transient critical heat fluxes (CHFs) of the subcooled water flow boiling for the flow velocities (u=4.0 to 13.3 m/s), the inlet subcoolings (ΔTsub,in=68.08 to 161.12 K), the inlet pressure (Pin=718.31 to 1314.62 kPa), the dissolved oxygen concentration (O2=2.94 ppm to Saturated one) and the exponentially increasing heat input (Q0 exp(t/τ), τ=16.82 ms to 15.52 s) are systematically measured with the experimental water loop comprised of the pressurizer. The SUS304 tubes of the inner diameters, (d=3, 6, 9 and 12 mm), heated lengths, (L=33.15 to 132.9 mm), L/d=5.48 to 11.075 and wall thickness (δ=0.3 and 0.5 mm) with the rough finished inner surface (Surface roughness, Ra=3.18 μm) are used in this work. The transient CHF data are compared with the steady state ones previously obtained and with the values calculated by the transient CHF correlation against inlet subcooling and the steady state CHF correlation against outlet subcooling. The transient CHF correlation against outlet subcooling is also derived based on the experimental data. The transient CHF is investigated into details for the exponentially increasing heat input (Q0 exp(t/τ), τ=16.82 ms to 15.52 s) and the dominant mechanism of the subcooled flow boiling critical heat flux for high heating rate is discussed.

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