流下液膜による垂直高温厚肉面のリウェッティングに関する研究 : 沸騰熱伝達特性による検討とモデル化

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Rewetting of vertical-hot-thick slab was investigated experimentally and analytically. Quenching tests of thick copper and brass blocks were conducted for a falling film of saturated water in a range of the flow rate from 0.096 to 0.639 kg/ms at atmospheric pressure. The test sections were 50,25 and 230mm in width, thickness and height, respectively. The rewetting velocities of the oxidized surfaces, which corresponded to quenching velocities, were faster than those of the non-oxidized surfaces irrespective of the flow passage spacing and the surface roughness. The rewetting velocities of the brass block were lower than those of the copper block. Relations between heat fluxes and wall superheats, which were obtained by solving a two-dimensional transient inverse-conduction equation, indicated that the heat transfer characteristics during the rewetting were quite similar to those of the conventional pool boiling. Simulation of the rewetting was also performed by using the two-dimensional transient heat conduction model with the boundary conditions corresponding to the pool boiling characteristics. The rewetting velocities measured were well reproduced by the simulation. The experimental and the simulation results suggested that precursory cooling during the film boiling, i. e. the stored energy just before the wetting, and the transition boiling heat flux just after the wetting had a large effect on the rewetting velocity ; the smaller the stored energy was and the larger was the transition boiling heat flux, the faster the revetting vecolity.
1998-08-25

流下液膜による垂直高温厚肉面のリウェッティングに関する研究 : 沸騰熱伝達特性による検討とモデル化

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