HEAT TRANSFER IN DOWN FLOWING TURBULENT EVAPORATING LIQUID FILMS WITH DEVELOPED WAVY STRUCTURE AND CO-CURRENT STEAM FLOW

摘要

The result of heat transfer modeling in down flowing turbulent films with the developed wavy structure at the regime of evaporation from film interface at free falling and with co-current steam flow, a heat transfer model which takes into account a cyclic process of temperature field relaxation with the periodic mixing of film by big waves, has been presented. The temperature profiles along with the integral heat transfer coefficients (HTC) were obtained as a result of approximate solutions of heat transfer differential equations of in turbulent flows, adapted thus to film flux with large surface waves, utilizing turbulent transport model by M.D.Millionschykov. The results of experimental research of heat transfer processes to water and sugar solutions with concentration up to 70% in the regime of evaporation from the inter-phase are presented.