Heat transfer from a uniform heat flux wedge in air-water mist flows

Abstract

Heat transfer from a wedge in air-water mist flow has been measured over a mass flow ratio M from 0 to 3 × 10 −2. Addition of small quantities of water-droplets to air stream enhanced two-phase heat-transfer coefficients h (2) from 2 to 14 times the corresponding single-phase ones. While the value of h 2 increases with increasing the wall temperature T w at high mass flow ratios, it decreases with increasing T w at low mass flow ratios, particularly in a dryout state. Generally h (2) increases with M and approach velocity. These tendencies are well explained by the present first-order theory.