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ISSN Online: 2377-424X

International Heat Transfer Conference 3
August, 7-12, 1966, Chicago, USA

FLUID-FLUID HEAT TRANSFER IN A PACKED COLUMN

Get access (open in a dialog) DOI: 10.1615/IHTC3.730
pages 322-328

Resumo

Direct-contact heat transfer between a liquid of limited volatility and a gas is of interest in a number of process industries. From dimensional reasoning it is shown that
Nu ~ ReG3/2PrG1/2ReL1/4GrL−1/6(PL1/2/PG)
Limited experimental data on the cooling of a non-volatile petroleum oil with air in a 4-inch diameter packed column are consistent with the expression. The large exponent on the gas-phase Reynolds number is attributed to the thinning of the gas boundary layer by the mobile liquid film. Such thinning may not be possible in similar mass transfer operations. By controlled additions of a volatile component, considerable enhancements of the heat-transfer coefficients arise and such enhancements may explain the low interfacial areas deduced when vaporisation rates are compared with gas-absorption rates.