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IMPROVED HEAT TRANSFER IN MULTISTAGE FLASH EVAPORATION.
NAVAL CIVIL ENGINEERING LAB PORT HUENEME CALIF
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A study was made to explore the promising methods for improvement of multistage flash evaporators for the production of potable water from contaminated sources. The nature of the cycle is such that it is clearly limited by the heat-transfer processes. Of the available methods for improving heat transfer simply and reliably, it was concluded that the use of a convoluted heat-transfer wall which produces thin films on both surfaces showed the greatest promise. High heat-transfer rates had previously been reported for such a surface, but measurements had not been reported which allowed detailed assessment of the total picture. This report gives the details of a surface with small convolutions and the results of laboratory experiments to isolate the film coefficients on the two sides of the heat-transfer surface. A second experiment allowed direct measurement of an identical surface on the low-temperature side only, using a cat whisker thermocouple search technique. Author
APPROVED FOR PUBLIC RELEASE