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  • On the Conditions of Incipient Subcooled-Boiling with Forced Convection
  • キョウセイ タイリュウ オ トモナウ ヒョウメン フットウ カイシ ジョウケン ニ ツイテ

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Generally the boiling is possible to start at the surface temperature of heated wall somewhat exceeds the saturated temperature of the liquid, and the heat flux at initial boiling varies depending on fluid temperature, liquid velocity, system pressure, surface condition of heated wall, and so on. In this paper, an analytical consideration was tried to make clear the conditions of incipient subcooled-boiling with forced convection, and the equation to estimate the heat flux under that condition was determined. By comparing with the authors' data at atmospheric pressure or the experimental data of previous investigators at high pressure, the analytical result agrees very well with experimental one. The relation to estimate the conditions of initial boiling is as follows : [numerical formula] where, A : heat equivalent of work, De : hydraulic diameter, Pr : Prandtle number, q : heat flux, r : latent heat, Ts : saturated temperature, ΔTsub : subccoling, U : velccity, v : speciffic volume, λ : thermal conductivity, ν : kinematic coefficient of viscosity, σ : surface tension. Suffix ; g : vapor, l : liquid, o : value of bulk temperature.

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