Publicado 8 números por año
ISSN Imprimir: 1065-5131
ISSN En Línea: 1563-5074
Indexed in
Two-Phase Dispersed Flow Heat Transfer Augmented By Twisted Tapes
SINOPSIS
Heat transfer was experimentally determined in the post-CHF region of a steady-state two-phase flow of a refrigerant in a vertical tube with swirl induced by twisted-tape inserts. The wall-superheat was low (below 60 °C) for application to fluid-fluid heat exchangers. The mass flux of the experiments, 140 to 1300 kg/m2·s, covered the range between existing work at low and high mass fluxes, respectively. Four tapes were used with the tape-twist-ratio range of 2.5 to 9.2. A temperature-controlled experimental facility allowed steady-state testing, and experiments generally included a superheated vapor exit condition so that the entire post-CHF region was included. Two important trends observed in the results of over 80 tests in this investigation were identified separately in previous studies. These trends exhibited different heat transfer enchancement as a function of mass flux, and the data were correlated for both cases. Heat transfer augmentation with the twisted-tape inserts was measured and predicted up to a factor of eight greater than axial flow post-CHF heat transfer.
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Eckert E.R.G., Goldstein R.J., Ibele W.E., Patankar S.V., Simon T.W., Strykowski P.J., Tamma K.K., Kuehn T.H., Bar-Cohen A., Heberlein J.V.R., Hofeldt D.L., Davidson J.H., Bischof J., Kulacki F., Heat transfer—a review of 1994 literature, International Journal of Heat and Mass Transfer, 40, 16, 1997. Crossref
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Yoo S.-J., France D. M., Tarshish T. M., Post-Critical Heat Flux Swirl Flow Heat Transfer with Two Refrigerants and Water, Journal of Thermophysics and Heat Transfer, 11, 2, 1997. Crossref