HEAT TRANSFER COEFFICIENTS IN LIQUID FILM EVAPORATOR

Regeneration is the most efficient way of managing used oil. It saves money by preventing costly clean-ups and liabilities that are associated with mismanagement of used oil and it helps to protect the environment of course. A numerical study of the flow, heat and mass transfer characteristics of the vertical evaporating tube with the films flowing down on both the inside and outside tube walls has been carried out. Condensation occurs along the outside wall and evaporation at the free surface of the inside film. The calculation domain of two film flow regions and tube wall is solved simultaneously. The longitudinal variation of temperature, mass flow rate, and hence thickness of the films downward the tube may be obtained by applying conservation of energy requirement to the differential element.