Phase Distribution Measurements during Transient Bubbly Two-Phase Flow in a Vertical Pipe

Abstract

An experimental procedure for investigating transient bubble flow for an adiabatic air/water system with vertical upward flow in a pipe is presented. The results of the measured local transient two-phase flow parameters are shown along a pipe length of approx. four meters. From the measured radial phase distributions under steady and under transient conditions one can draw conclusions about the interfacial forces. Here, the effects indicate the action of forces such as a transverse lift force and a time dependent force like the virtual mass force during the transient. For modelling the transverse lift force which seems to play a dominant role for that flow regime the formulation of Zun was chosen and it was implemented into the commercial CFD-Code Fluent Release 4.4.4 via user-defined subroutines. Finally, results from the simulation of the steady states of start and end conditions of an experimental measured transient are shown.

Development of kerosene–water two‐phase up‐flow in a vertical pipe downstream of A 90° bend

“…Commercial softwares have been widely used by researchers to study the gas–liquid and liquid–liquid flows (Bertodano et al, 1994; Tillenkamp and Loth, 2000; Matos et al, 2004; Graf and Papadimitriou, 2007; Wang et al, 2008; Walvekar et al, 2009; Parvini et al, 2010). In this study, ANSYS Fluent 12.0 is used to study the kerosene–water flow in a pipeline system.…”

“…Tillenkamp and Loth (2000) developed an experimental procedure for investigating transient air–water bubbly flow in a vertical pipe of 4 cm diameter and 7 m length. The CFD Fluent 4.4 software was also used to study the effect of transverse lift force developed by Zun (1980) on radial phase distribution.…”