Analysis of Steam Condensation Heat Transfer with a Noncondensable Gas in a Vertical Condenser Tube

Abstract A theoretical model using a heat and mass transfer analogy was developed to investigate the effects of noncondensable gases on the heat transfer coefficient of steam condensing inside a vertical tube. The Nusselt and Sherwood numbers in the gas phase were modified to incorporate the effects of condensate film roughness, suction, and developing flow. The model predictions showed good agreement with the experimental data obtained for various experimental conditions. A parametric study was conducted using the model with condenser tube diameter as a variable. The results indicated that the effects of noncondensable gases become weak as the inlet mixture Reynolds number (Remix,in = 4ṁmix,in/πdi μmix,in) increases and inlet noncondensable gas mass fraction (Wnc,in = ṁnc, in/(ṁnc,in + ṁv,in)) decreases. In addition, the effects of noncondensable gases also become weak as the condenser tube diameter decreases with the same inlet mixture Reynolds number because of interfacial shear stress.

[1]  Shripad T. Revankar,et al.  Experimental and theoretical investigation of film condensation with noncondensable gas , 2006 .

[2]  V. Carey.  Liquid-Vapor Phase-Change Phenomena , 2020 .

[3]  Donald M. McEligot,et al.  Thermal Entry for Low Reynolds Number Turbulent Flow , 1969 .

[4]  D. Dipprey,et al.  An experimental investigation of heat and momentum transfer in smooth and rough tubes at various Prandtl numbers , 1961 .

[5]  N. K. Maheshwari,et al.  Investigation on condensation in presence of a noncondensable gas for a wide range of Reynolds number , 2004 .

[6]  Hee Cheon No,et al.  Non-Iterative Condensation Model for Steam Condensation with Noncondensable Gas in a Vertical Tubes , 2002 .

[7]  M. Siddique,et al.  The effects of noncondensable gases on steam condensation under forced convection conditions , 1992 .

[8]  Per F. Peterson,et al.  Diffusion layer modeling for condensation in vertical tubes with noncondensable gases , 1993 .

[9]  A. Colburn,et al.  Design of Cooler Condensers for Mixtures of Vapors with Noncondensing Gases , 1934 .

[10]  Gumersindo Verdú,et al.  Turbulent vapor condensation with noncondensable gases in vertical tubes , 1996 .

[11]  Mujid S. Kazimi,et al.  Theoretical modeling of forced convection condensation of steam in a vertical tube in the presence of a noncondensable gas , 1994 .

[12]  Michael L. Corradini,et al.  Modeling of condensation heat transfer in a reactor containment , 1990 .

[13]  Chuan-Jing Tu,et al.  Effects of non-condensable gas on laminar film condensation in a vertical tube , 1988 .

[14]  Per F. Peterson,et al.  Recent experiments for laminar and turbulent film heat transfer in vertical tubes , 1997 .