DOWNFLOW BOILING AND NONBOILING HEAT TRANSFER IN A UNIFORMLY HEATED TUBE

摘要

Local heat-transfer coefficients in forced convection, downflow boiling, and nonboiling have been measured by use of an electrically heated type-204 stainless steel tube (0.7194 in. l.d. x 0.7502 in. o.d. x 68.0 in. long). Average forced-convection heat-transfer coefficients in turbulent one-phase flow and local total pressure gradients in two-phase flow were also determined.nData have been obtained for the boiling of distilled water with mass fluxes of 51 to 165 lb /sec ft2, , heat fluxes from 13,8*103to 49.8*105 BTU/nr ft 2, pressures from 15.8 to 30.9 psia, and qualities up to 14％.