Inscrição na biblioteca: Guest

ISSN Online: 2377-424X

ISBN Print: 0-89116-130-9

International Heat Transfer Conference 6
August, 7-11, 1978, Toronto, Canada

GAS STRIPPING IN TWO-PHASE FLOW

Get access (open in a dialog) DOI: 10.1615/IHTC6.3650
pages 167-172

Resumo

If a liquid containing dissolved gas is boiled most of the gas tends to be stripped out into the vapour In systems such as water-cooled reactors where hydrogen is dissolved this can markedly reduce the protection. Recently published data on gas stripping in vertically upward in-tube flow give measured dissolved gas concentrations in the outlet liquid. The results were compared with Henry's Law of gas partition, which might be thought to indicate the maximum stripping possible, and some of the data showed significantly greater stripping. In this paper other models of gas transfer are considered and more general limits proposed.

Two quantitative models were examined. The first considers the gross effects of gas transfer from the bulk of the flowing liquid, through some interface into the bulk of the flowing vapour. A literature survey gave mass transfer coefficient correlations needed to evaluate the model. The predicted stripping rates were considerably lower than the experimental values.

The second model assumes the stripping process to be governed by mass transfer into bubbles growing on the heater wall. Stripping rates were calculated by a model based on a bubble growing in an infinite volume of uniformly superheated liquid and gave reasonable agreement with experimental data.