Prediction of the heat transfer between the pipe wall and the fluid flow during depressurization (blowdown) of multiphase pipelines is a conjugate heat-transfer problem since the heat transfer rate at the wall-fluid interface and local fluid conditions are directly dependent on each other and need to be simultaneously calculated. In an earlier study by the author, a numerical solution for pipeline blowdown has been found based on a novel approach to the formulation of energy equation for the fluid flow in the pipeline. In this study, the applicability of the this approach for modeling of the conjugate heat-transfer in the two-phase flow conditions during blowdown of pipelines conveying flashing liquids is demonstrated by a comparison of numerical results obtained on the basis of the new formulation with predictions involving rigorous conjugated heat-transfer calculations. It is shown that the effect of heat transfer on the fluid behavior can be evaluated with the use of a fundamental dimensionless parameter governing the amount of heat transferred from the pipe wall to the flashing liquid flowing through the pipeline. The proposed approach facilitates the analysis of the consequences of controlled or accidental releases of highly volatile liquids from long pipelines and can be used in the design of oil/gas production and transportation systems.
Dimensionless number for evaluating the effect of conjugate heat transfer on flow behavior during depressurization of multiphase pipelines
1999
Seiten
Aufsatz (Konferenz)
Datenträger
Englisch
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