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International Heat Transfer Conference 5

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

EXPERIMENTAL STUDY OF CONDENSATION FROM STEAM-AIR MIXTURES FLOWING OVER A HORIZONTAL TUBE: OVERALL CONDENSATION RATES

Anthony F. Mills
Mechanical and Aerospace Engineering Department, University of California, Los Angeles, CA 90095, U.S.A.

C. Tan
University of California, Los Angeles, U.S.A.

D. K. Chung
University of California, Los Angeles, U.S.A.

DOI: 10.1615/IHTC5.830
pages 20-23

Abstract

Overall condensation rates are reported for filmwise condensation from steam-air mixtures undergoing forced flow down upon a horizontal tube with saturation temperatures of 307-339 K, bulk to wall temperature differences of 1.6-25.6 K, bulk air mass fraction 0-7.8 percent and oncoming vapor velocity 0.28-0.98 m/s. For pure steam the heat transfer coefficients averaged 3.2 percent higher than predictions of uniform heat flux Nusselt theory; the discrepancy is attributed to vapor drag. For steam-air mixtures the reduction in heat transfer can be calculated from a correlation of the mass transfer conductance based on the asymptotic theory of Acrivos for boundary layers under strong suction.

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