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On the Growth and Propagation of Interfacial Disturbances in ahorizontal stratified flow
François Henry, Yann Bartosiewicz
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Abstract
This work investigates the capability of the CATHARE 3 system code to predict growth and propagation of interfacial waves of a gas-liquid horizontal stratified flow. Steam water stratified flows may occur in the hot leg of PWR in some local transients. In horizontal pipes, the ability of system codes to predict the entrainment-deposition of droplets is of interest because this phenomenon plays an important role on the mechanical coupling between phases. This work is an attempt to develop a droplet entrainment model based on wave stability to replace existing semi-empirical models. As a first step, a linear stability analysis is performed to determine flow regime transitions and the appearance of first waves. This study is in the framework of a two-fluid model in conjunction with the closure relations used in CATHARE 3. The dispersion equation of interfacial waves is derived from and compared to results from literature. The effects of gas and liquid flow rates and pipe diameter are mainly investigated.