[2E05-08] Numerical Simulation

[2E08] Profiles of Steam Mass Fraction in Flows of Saturated Steam and Air Mixture in a Vertical Pipe

*Michio Murase¹, Yoichi Utanohara¹, Shigeo Hosokawa³, Akio Tomiyama² (1. Institute of Nuclear Safety System, Inc., 2. Kobe University, 3. Kansai University)

Keywords:Condensation heat transfer, Non-condensable gas, Vertical pipe, Temperature profile, Steam mass fraction, Wall function

Wall functions are generally used in turbulent analysis with relatively large computation cells. In this study, profiles of steam mass fraction were evaluated by using temperature profiles previously measured for flows of saturated steam and air mixture in a vertical pipe with the diameter of 49.5 mm, and the existing correlation for the turbulence region based on the logarithmic law was improved.