Abstract—In the offshore platform, T-junction has been
extensively used as preliminary gas-liquid separator due to its
compact design. Frequently, a sudden slug generation causes
liquid carryover issues leading to excessive liquid in the gas
feed for downstream equipment. Geometry features of
T-junction and slug flow are believed to be the root cause of
this problem. Based on the literature review, previous works
mostly focused on improving two-phase separation in the
standard T-junctions without taking into account the impact of
inlet flow regime. Moreover, there is no published research on
the separation performance of converging T-junction, which is
a promising design. The objective of this research is to
numerically evaluate the hypothesis that converging T-junction
yields better phase separation under slug flow compared with
regular and reduced T-junctions. Three-dimensional
Computational Fluid Dynamics (CFD) software FLUENT 17.2
and specialized User Defined Functions was utilized to study
the evolutionary process of air-water slug flow and its phase
separation behavior in converging T-junctions over eight
different geometry designs. The incompressible Volume of
Fluid (VOF) method was used to capture the transient
distribution of segregated gas-liquid interface. The validity of
the present model was compared with the experimental data
taken from the air-water two-phase flow in 3-inch diameter
main pipe of T-junction. The validated model gave a strong
foundation to proceed with converging T-junction simulation.
The research found that the converging T-junction can
increase by upto 20% of separation efficiency compared with
regular and reduced T-junction at the same operating
conditions. Moreover, the converging T-junction with the main
and converging diameter ratio of 0.67 and 0.4, respectively, to
be optimal in improving the phase separation over a wide
spectrum of air and water superficial velocities.
Index Terms—Numerical simulation, slug flow, T-junction,
two-phase separation.
The authors are with the Modeling and Simulation Center – Viettel High
Technologies Corporation, Vietnam (Corresponding author: Minh Cong Tran,
minhtc3@viettel.com.vn).
[PDF]
Cite: Minh Cong Tran, Hai Anh Nguyen, and Dat Tien Nguyen, "Numerical Simulation of Two-Phase Slug Flow Liquid-Carryover in a Converging T-junction," International Journal of Materials, Mechanics and Manufacturing vol. 8, no. 3, pp. 94-103, 2020.
Copyright © 2020 by the authors. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (
CC BY 4.0).