Critical heat fluxes of subcooled water flow boiling against inlet subcooling in short vertical tube

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Abstract

The critical heat fluxes (CHFs) of subcooled water flow boiling for the test tube inner diameters (d = 3 and 6 mm) and the heated lengths (L = 67, 120 and 150 mm) are systematically measured for the flow velocities (u = 4.0 to 13.3 m/s), the inlet subcoolings (ΔTsub,in = 48 to 148 K), the outlet subcoolings (ΔTsub,out = 10.5 to 95.1 K), the inlet pressure (Pin = 753 to 995 kPa) and the outlet pressure (Pout = 720 to 887 kPa). The SUS304 tubes of L = 67, 120 and 150 mm for d = 3 mm and L = 150 mm for d = 6 mm are used. The values of L/d are 22, 40 and 50 for d = 3 mm, and 25 for d = 6 mm, respectively. The CHFs, qcr,sub, for a fixed ΔTsub,out become gradually lower with an increase in the L/d in the whole experimental range. The CHF correlation against outlet subcooling, which has been previously derived for L/d lower than 16, was modified to new one containing the L/d effect based on these experimental data. Furthermore, the relation between qcr,sub and L/d for a fixed ΔT sub,in was checked. The values of qcr,sub for a fixed ΔTsub,in became exponentially lower with the increase in L/d. CHF correlation against inlet subcooling has been given based on the experimental data for L/d ranging from 4.08 to 50. The correlations against outlet and inlet subcoolings can describe not only the CHFs obtained in this work for the inner diameter of 3 and 6 mm at the outlet pressure of around 800 kPa but also the authors' published CHFs data (1611 points) for the wide ranges of Pin = 159 kPa to 1 MPa, d = 3 to 12 mm, L = 33 to 150 mm and u = 4.0 to 13.3 m/s within 15% difference for 30 K≤ΔTsub,out≤ 140 K and 40 K≤ΔTsub,in≤ 151 K.

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APA

Hata, K., Komori, H., Shiotsu, M., & Noda, N. (2004). Critical heat fluxes of subcooled water flow boiling against inlet subcooling in short vertical tube. JSME International Journal, Series B: Fluids and Thermal Engineering, 47(2), 306–315. https://doi.org/10.1299/jsmeb.47.306

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