Journal
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
Volume 100, Issue -, Pages 16-29Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijmultiphaseflow.2017.11.018
Keywords
High viscosity liquids; Transition to chum; Chum flow; Large diameter; Electrical Capacitance Tomography; Volcanic conduits
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Funding
- Kurdistan Regional Government in Iraq (HCDP)
- MEMPHIS EPSRC [EP/K003976/1]
- Engineering and Physical Sciences Research Council [EP/K003976/1] Funding Source: researchfish
- EPSRC [EP/K003976/1] Funding Source: UKRI
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Churn flow is an important intermediate flow regime occurring in between slug and annular flow patterns in two-phase flow, with profound implications in chemical and petroleum industry. The majority of studies to date in churn flow have been carried out mainly using water or liquids of low viscosities and limited information exists regarding the behaviour of high viscosity liquids which resemble realistic process conditions. In this paper, a study that investigated churn flow and its characteristics in high viscosity oils (360 and 330Pa.s) and large diameter columns (240 and 290mm) is presented for a first time. Transition to churn flow regime starts when the structure velocity, length and frequency of the liquid bridges, which appear at the end of slug flow, increase. In churn flow, gas flows at the core of the oil column with a wavy passage, leaving the top surface open to atmosphere with a possibility of creating a very long bubble. The average length of the bubbles seen to decrease with increasing the gas flow rate. While, no considerable change is observed in void fraction, structure velocity and film thickness at this flow pattern. (C) 2017 Elsevier Ltd. All rights reserved.
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