プール沸騰に関する研究 : 第4報, 大気圧近傍で合体泡下に形成される液膜厚さ

概要

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Macrolayer thickness was determined on the basis of the relationship q_<CHF>=δ_1ρ_1H_<fg>f, which was derived from the dry-out model of liquid film formed repeatedly on heated surfaces. Critical heat flux q_<CHF> is measured on a horizontal heated disk of 20mm in diameter in the range of pressures from 0.02 MPa to 0.4 MPa for water and ethanol. Departure frequency of large coalesced bubbles, which entirely cover the heated disk, was calculated from the relationship f=0.215{g(ρ_1-ρ_v)/ρ_1}^<5/9>/(ν_1・D^3)^<1/9>. Theoretical relationships correlating the obtained data of macrolayer thickness are derived by the dimensional analysis, under the assumptions that a macrolayer is formed by the coalescence of primary bubbles or coalesced bubbles. The macrolayer data are well correlated with the derived correlations.
一般社団法人日本機械学会の論文
1992-08-25