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First Thermal and Fluids Engineering Summer Conference

ISSN: 2379-1748
ISBN: 978-1-56700-430-4

CFD SIMULATION OF VELOCITY AND VOID FRACTION DISTRIBUTION OF TWO-PHASE FLOWS (AIR-WATER) IN VERTICAL HELICAL COILS

DOI: 10.1615/TFESC1.mph.012838
pages 1751-1765

Rouhollah Moosavi
Florida International University; Department of Mechanical Engineering, Yasouj University, Iran

Hamid Saffari
Iran University of Science and Technology

Robel Tesfamariam
Department of Mechanical Engineering, Florida International University, USA

Cheng-Xian Lin
Department of Mechanical and Materials Engineering Florida International University, Miami, Florida 33174, USA


KEY WORDS: Two-phase turbulent flow, Helical coil, CFD , Eulerian-Eulerian

Abstract

CFD simulation for single and two-phase flow and distribution of velocity field and void fraction of fluid flow in vertical helical coils by varying coil parameters has been investigated. The considered Reynolds number is in the range of 10000 < Re < 80000, and the void fraction is in the range of 0.01 < α < 0.09. To simulate the two-phase fluid flow (air-water) in this article, the Eulerian-Eulerian model was employed. The 3-D governing equations of continuity and momentum have been solved by using the finite volume method. To calculate the turbulent fluctuations, the k − ω turbulence model has been used. According to the secondary motion in a curved tube, a major difficulty in describing the problem has been recognition of the importance of flow development at the entrance of a helical tube. The close correlation between the obtained numerical results and the experimental results confirms the accuracy of the applied method in mesh generation and in numerically solving the governing equations.

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