Effect of diameter and heated length on critical heat flux for water flowing in small-diameter tubes
- Kyoto Univ. (Japan)
- Nagoya Univ. (Japan). Dept. of Nuclear Engineering
The purpose of this study is to present new data on critical heat flux (CHF) for forced-convection boiling of water in small-diameter tubes. An experiment was conducted with atmospheric pressure water in small-diameter tubes with inner diameters D of 2.2, 4.0, and 6.0 mm, and length-to-diameter ratios L/D ranging from 5 to 50. CHF was measured as a function of mass velocity over the range from 0 to 13,000 kg/(m{sub 2}s) at a given inlet water temperature, and the effects of tube diameter and L/D were investigated. The highest CHF attained in this experiment was 63 MW/m{sub 2} in a tube with D = 2.2 mm and L/D = 5. The experimental results were compared with several existing CHF correlations. Some of them presented good agreement with the present data in a limited range either at high quality or in the subcooled region.
- OSTI ID:
- 89572
- Journal Information:
- Heat Transfer - Japanese Research, Journal Name: Heat Transfer - Japanese Research Journal Issue: 5 Vol. 23; ISSN 0096-0802; ISSN HTJPAU
- Country of Publication:
- United States
- Language:
- English
Similar Records
Critical Heat Fluxes of Subcooled Water Flow Boiling Against Outlet Subcooling in Short Vertical Tube
A Procedure to Predict Subcooled-Water-Flow-Boiling CHF in Uniformly Heated Tubes for High-Heat-Flux Applications