EXHANCEMENT OF HORIZONTAL TUBE SPRAY FILM EVAPORATORS BY STRUCTURED SURFACES.

M. C. Chyu, A. E. Bergles

Research output: Contribution to journalConference articlepeer-review

13 Scopus citations

Abstract

Extensive experimental tests for tubes with commercial structured surfaces in a single horizontal tube spray or falling film evaporator were conducted. The test sections were hollow copper cylinders with GEWA-T, Thermoexcel-E, or High Flux surfaces, electrically heated by inserted cartridge heaters. A plain surface was also tested and all tubes were tested in pool boiling. Falling film evaporation provides much higher coefficients than pool boiling in the low heat flux, convective region. The GEWA-T surface is especially effective due to increased surface area. At high heat fluxes, the nucleate boiling behavior of the Thermoexcel-E and High Flux surfaces is similar to the respective pool boiling curves. Unusual incipient boiling effects and operational factors, such as surface aging, surface subcooling, and rate of heat flux change, are described. (Author abstract. )

Original languageEnglish
Pages (from-to)39-47
Number of pages9
JournalAmerican Society of Mechanical Engineers, Heat Transfer Division, (Publication) HTD
Volume43
StatePublished - 1985

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