Simulation of Steam Condensation Inside Vertical Tube with Noncondensable Gases Using MELCOR

Using MELCOR, the numerical simulation of steam condensation inside vertical tube in the presence of noncondensable gases is carried out. Calculated results are compared with Kuhn’s experimental results. Generally the agreement is satisfactory except that the heat transfer process and condensed film accumulation were overestimated, leading to the larger heat transfer coefficient. After modification of parameters of MELCOR model, the thickness of film and the overall heat transfer coefficient were decreased and agreed well with experiment data. Thus the MELCOR model is valid.