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VGU RESEARCH REPOSITORY


Please use this identifier to cite or link to this item: https://epub.vgu.edu.vn/handle/dlibvgu/2182
Title: Numerical analysis of complex liquid flow in a pipe
Authors: Nguyen Hoang Huy 
Keywords: Viscoplastic fluid;Computational fluid dynamics;Non-Newtonian pipe flow
Issue Date: 2020
Abstract: 
In this thesis, the flow of a viscoplastic fluid in a pipe with the presence of a baffle is
investigated. The fluid is of a Bingham type characterized by a yield stress, when the
stress is above this, there exists a flow, otherwise, it behaves like a solid. The
thixotropic characteristic is also explored, which is a rheological property associated
with the microstructure of the material. It can be broken and recovered during a flowing
process. Applications of such a fluid are numerous such as sewage and underground
drainage, and flow of oil and fresh concrete/cement in pipes or pumping systems.

The flow in the pipe is considered to be two-dimensional (2D), i.e., the pipe can be
treated as a 2D channel. The baffle is attached to the upper wall, the distance between
its tip and the bottom wall, so-called the gap G, is varied taking the values of G/D =
0.75, 0.5 and 0.25. Simulations of the flow at two Reynolds numbers, i.e., Re = 100 and
1000, and several Bingham numbers are performed using Ansys Fluent. Many aspects
of the flow such as the streamline patterns, the vortex structures, the velocity field and
the unyielded zones are investigated. In addition, influence of the gap on the flow
characteristics is examined.
URI(1): https://epub.vgu.edu.vn/handle/dlibvgu/2182
Rights: Attribution-NonCommercial 4.0 International
Appears in Collections:Computational Engineering (CompEng)

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