An experimental study of single-phase and two-phase flow in annular helicoidal pipes Article

Xin, RC, Awwad, A, Dong, ZF et al. (1996). An experimental study of single-phase and two-phase flow in annular helicoidal pipes . American Society of Mechanical Engineers, Heat Transfer Division, (Publication) HTD, 330 11-17.

cited authors

  • Xin, RC; Awwad, A; Dong, ZF; Ebadian, MA

abstract

  • In this study, experimental investigations were conducted for single-phase and two-phase flow in annular helicoidal pipes with vertical and horizontal orientations using air and water as working fluids. Three test sections were tested The outer diameters of the inner tube were 12.7 mm, 9.525 mm, and 6.35 ram, while the inner diameters of the outer tube were 21.18 mm, 15.748 mm, and 10.21 mm, respectively. The experiments were performed for superficial water Reynolds numbers in the range of 210-23,000 and superficial air Reynolds numbers in the range of 30-30,000. The effects of coil geometry and the flow rates of air and water on single-phase and two-phase flow pressure drop were experimentally investigated for annular helicoidal pipes. The data were correlated as the relationship of the pressure drop multiplier versus the Lockhart-Martinelli parameter for the two-phase flow. The average void fraction was also measured in the experiments by means of the quick acting valve method Unlike two-phase flow in straight pipe, the pressure drop multiplier of two-phase flow in annular helicoidal pipe has been found to be dependent on the flow rate besides the Lockhart-Martinelli parameter for large pipe diameter in annular helicoidal pipe. The Lockhart-Martinelli correlation is not valid in the prediction. Correlations for two-phase flow in horizontal and vertical annular helicoidal pipe have been established for both singlephase and two-phase flow based on the present experimental data.

authors

publication date

  • December 1, 1996

published in

start page

  • 11

end page

  • 17

volume

  • 330