Flow Patterns and Pressure Drop in Air/Water Two-Phase Flow in Horizontal Helicoidal Pipes

[+] Author and Article Information
A. Awwad, R. C. Xin, Z. F. Dong, M. A. Ebadian

Department of Mechanical Engineering, Florida International University, Miami, FL 33199

H. M. Soliman

Department of Mechanical Engineering, University of Manitoba, Winnipeg, Manitoba, Canada

J. Fluids Eng 117(4), 720-726 (Dec 01, 1995) (7 pages) doi:10.1115/1.2817328 History: Received March 29, 1994; Revised March 29, 1995; Online December 04, 2007


An experimental investigation is conducted for air/water two-phase flow in horizontal helicoidal pipes. The helicoidal pipes are constructed of 25.4 mm I.D. Tygon tubing wrapped around cylindrical concrete forms with outside diameters of 62 cm and 124 cm. The helix angles of the helicoidal pipes vary from 1 to 20 deg. The experiments are performed for superficial water velocity in a range of UL = 0.008 ~ 2.2 m/s and for superficial air velocity in a range of UG = 0.2 ~ 50 m/s. The flow patterns are discerned and recorded photographically. The pressure drop of the air/water two-phase flow in the coils is measured and the Lockhart-Martinelli approach is used to analyze the data. The results are presented in the form of frictional pressure drop multipliers versus the Lockhart-Martinelli parameter. It was found that the flow patterns differ greatly from those of the straight pipe, and that the frictional pressure drop multipliers depend on both the Lockhart-Martinelli parameter and the flow rates. The correlation of the frictional pressure drop has been provided based on the current data. Furthermore, it was also found that the helix angle of the helicoidal pipe had almost no effect on the air/water two-phase flow pressure drop in the present experimental ranges.

Copyright © 1995 by The American Society of Mechanical Engineers
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