OCTOBER 19-20, 2012 - YMCA University of Science & Technology

Proceedings of the National Conference on
Trends and Advances in Mechanical Engineering,
YMCA University of Science & Technology, Faridabad, Haryana, Oct 19-20, 2012
Mathematical model
The use of a specific multiphase model (the discrete phase, mixture, Eulerian model) to characterize
momentum transfer depends on the volume fraction of solid particles and on the fulfillment of the requirements
which enable the selection of a given model.
Geometries for CFD simulation
The computational grid for the horizontal pipe bend similar to that used in experiments having size of
5m before bend and 0.8m after bend in horizontal plane and it has 52mm internal diameter. It consists of 300120
hexahedral cells and 322344 nodes has been generated using GAMBIT software.
Grid Generation
The body-fitted coordinate technique was used with the help of the Gambit software package to
generate three-dimensional grids for bend and straight sections, according to the actual dimensions of the test
sections.
Volume statistics:
Minimum volume: 5.5X 10 -9 m 3
Maximum volume: 9.6X 10 -8 m 3
Total volume: 4.17 X 10 -2 m 3
Face area statistics:
Minimum face area: 1.38X 10 -6 m 2
Maximum face area: 2.47 X 10 -4 m 2
Fig. 2 Meshing at interior of pipe bend (horizontal to horizontal)
Numerical Simulation
The grid files generated by Gambit were used for the simulation in Fluent. The experimental conditions
were approximated using the following assumptions
• The flow was assumed to be isothermal
• The flow was assumed to be incompressible
• The flow was assumed unsteady.
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