INFLUENCE OF CONCURRENT STEAM SHEAR VELOCITY ON FALLING FILM EVAPORATION AND BOILING ON A HORIZONTAL TUBE. Conference Paper uri icon

abstract

  • The influence of concurrent steam shear velocity on the evaporation and boiling heat-transfer coefficients are presented for thin water films flowing over the outside of a 5. 08-cm horizontal, electrically heated smooth brass tube. Both local and average heat transfer data were obtained for steam velocities ranging from 0 to 26. 8 m/s corresponding to feed-water saturation temperatures ranging from 60 to 100 degree C and heat-flux values ranging from 15,800 to 78,800 w/m**2. Feed-water flow rate ranged from 2. 36 to 3. 79 cm**3/s per centimeter length of one side of the tube. The results show that, for a saturation temperature of 100 degree C, the heat transfer coefficients with high steam shear velocity (20 m/s) were about 20 to 30% higher than that with low steam shear velocity (10 m/s). However, for a saturation temperature of 60 degree C, the increase in heat transfer coefficients diminished over the range of steam velocity.

author list (cited authors)

  • Han, J. C., & Fletcher, L. S.

complete list of authors

  • Han, JC||Fletcher, LS

publication date

  • January 1987