Guidelines for Pressure Relief and Effluent Handling Systems by CCPS (Center for Chemical Process Safety)

Author:CCPS (Center for Chemical Process Safety)
Language: eng
Format: azw3
ISBN: 9781119330295
Publisher: Wiley
Published: 2017-06-21T16:00:00+00:00

A major complication for two-phase flows, especially for separated flows, arises from the effects of slip as well as acceleration and expansion as the pressure drops. The result is that the gas velocity exceeds that of the liquid, with a corresponding increase in the local holdup (Φm) of the liquid within the pipe. Both the volume fraction of liquid in the pipe (Φm = 1-αm) and the two-phase density (ρ2 = αmρG + (1-αm)ρL) increase as a result of slip. The relation between slip, S, the mass fraction of gas, x, the in-situ or flowing volume fraction of gas, αm, and the holdup, φm, is given by Equation (4.4-67).

Some of the simplest slip models are given below:

Moody (1965):

(4.4-68)

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