[2G01-04] Phase Change

[2G04] Evaluation of Wall Condensation Heat Transfer in Three-Component Gases Including Light Gas

*Toshiya Takaki¹, Michio Murase¹ (1. INSS)

Keywords:Vertical flat plate, Wall condensation, Light gas, Diffusion coefficient, Condensation heat transfer coefficient, Natural convection

We investigated existing studies on wall condensation in three-component gases of steam, air, and hydrogen or helium. For the diffusion coefficient affecting the condensation heat transfer coefficient h_c, we selected an equation expressed with a function of mole fractions of gas components and excluding the steam self-diffusion term, which gives a close value with the equation for steam and air mixture at the helium mole fraction of zero (X_He = 0). For the h_c correlation for natural convection flows, it was confirmed that the difference among h_c values computed by using existing correlations was large even for X_He = 0. Therefore, we made plan to evaluate h_c from forced to natural convection flows by using CFD computations.