Accession Number : AD0476216


Title :   THIN-FILM EVAPORATION IN A SINGLE TUBE.


Descriptive Note : Technical rept. Nov 64-Jun 65,


Corporate Author : NAVAL CIVIL ENGINEERING LAB PORT HUENEME CA


Personal Author(s) : Beck, E. J.


Report Date : NOV 1965


Pagination or Media Count : 33


Abstract : In a study of thin-film evaporation without boiling for the improvement of heat-transfer rates especially in seawater conversion units, experimental determinations were made of wall temperatures and evaporation coefficients for relatively thin films flowing down inside a vertical tube. Various methods of introducing the coolant with and without steam are discussed, as are methods of applying the results to vapor-compression stills. A series of runs with the same equipment were also made in which water was evaporated by nucleate boiling, as would occur in most conventional vapor-compression stills. The advantages and disadvantages of the various methods are discussed. The experiments indicate that an evaporator with standard vertical tubes, in which the evaporation is from a very thin film without boiling and the liquid is carried in a cocurrent flow of wet steam, would have better than a 2.5 advantage in fuel consumption over a conventional vapor-compression still with boiling. (Author)


Descriptors :   , (*FILMS, EVAPORATION), HEAT TRANSFER, SEA WATER, DISTILLATION, TEMPERATURE, MEASUREMENT, STEAM, DESALINATION.


Subject Categories : PHYSICAL CHEMISTRY


Distribution Statement : APPROVED FOR PUBLIC RELEASE