Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7051681 | Experimental Thermal and Fluid Science | 2018 | 25 Pages |
Abstract
Single-phase convection and steam-water two-phase flow boiling heat transfer experiments in an electrically heated 4â¯Ãâ¯16 staggered horizontal rod bundle under cross-flow condition have been carried out for the following range: 45â¯kgâ¯mâ2â¯sâ1â¯â¤â¯Gâ¯â¤â¯383â¯kgâ¯mâ2â¯sâ1, 20.0â¯kWâ¯mâ2â¯â¤â¯qâ¯â¤â¯55.0â¯kWâ¯mâ2, 0.02â¯â¤â¯xoutâ¯â¤â¯0.57 and 112â¯kPaâ¯â¤â¯Pinâ¯â¤â¯190â¯kPa. The major effects on local flow boiling heat transfer coefficients in horizontal rod bundles were analyzed. Firstly, the row number has a significant effect on local flow boiling heat transfer coefficients since the vapor bubbles generated from the lower rods impinge on the surface of the upper rods and enhance the turbulence there. Secondly, an increasing heat flux contributes to an increase of the average bundle flow boiling heat transfer coefficient at all mass velocities. Thirdly, the local quality can also slightly enhance the flow boiling heat transfer. Fourthly, the flow boiling heat transfer can be enhanced with an increasing mass velocity under lower heat fluxes. In a general, a Chen-type correlation was developed to predict local flow boiling heat transfer coefficients in horizontal rod bundles with a maximum deviation of ±20%.
Keywords
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Fluid Flow and Transfer Processes
Authors
K. Zhang, Y.D. Hou, W.X. Tian, Y.P. Zhang, G.H. Su, S.Z. Qiu,