Abo Bibliothek: Guest

ISSN Online: 2377-424X

International Heat Transfer Conference 5
September, 3-7, 1974, Tokyo, Japan

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

Get access (open in a dialog) DOI: 10.1615/IHTC5.830
pages 20-23

Abstrakt

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.