MEASUREMENTS OF LIQUID FILM THICKNESS OF A WIDE HORIZONTAL CO-CURRENT STRATIFIED AIR-WATER FLOW

Abstract

A horizontal co-current stratified two-phase flow was studied in a duct with a rectangular section. Its dimensions were such that the top and side walls did not influence the interfacial waves. The film thickness was almost of the millimeter. The Reynolds number based on the mean height and velocity in each phase varied from 0 to 1.16·105 in air and from 69 to 271 in water. These experimental conditions allowed the observation of the smooth, 2D wavy and 3D wavy stratified flow patterns. The interfacial waves were instantaneously measured on a 100 mm long line segment in the longitudinal midspan plane of the channel with the Level Detection and Recording technique. These measurements yielded statistical characteristics and highlighted the spectral differences between the 2D and 3D wavy stratified flow patterns.

Keywords

Dates

  • Submission Date2012-06-02
  • Revision Date2012-09-14
  • Acceptance Date2012-10-17

DOI Reference

10.2298/TSCI120602212T

References

  1. Hagiwara, Y., Esmaeilzadeh, E., Tsutsui, H., Suzuki, K., Simultaneous measurement of liquid film thickness, wall shear stress and gas flow turbulence of horizontal wavy two-phase flow, International Journal of Multiphase Flow, 15 (1989), 3, pp. 421-431
  2. Paras, S. V., Vlachos, N. A., Karabelas, A. J., Liquid layer characteristics in stratifiedatomization flow, International Journal of Multiphase Flow, 20 (1994), 5, pp. 939-956
  3. Lioumbas, J. S., Paras, S. V., Karabelas, A. J., Co-current stratified gas-liquid down flow - Influence of the liquid flow field on interfacial structure, International Journal of Multiphase Flow, 31 (2005), 8, pp. 869-896
  4. Akai, M., Inoue, A., Aoki, S., Endo, K., A co-current stratified air-mercury flow with wavy interface, International Journal of Multiphase Flow, 6 (1980), 3, pp. 173-190
  5. Zouana, A., Study of mass transfers at the interface of a laminar, non-established liquid film (in French language), Ph. D. thesis, University of Poitiers, Poitiers, France, 1988
  6. Planquart, P., Riethmuller, M., Joly, A., Detry, J. M., Real time optical detection and characterisation of water model free surfaces - Application to the study of the mold, Proceedings, 4th European Continuous Casting Conference, Birmingham, UK, 2002
  7. Tóth, B., Anthoine, J., Riethmuller, M. L., Dynamic measurements of the shape of a free surface (in French language), Proceedings, 9ème Congrés Francophone de Techniques Laser, Toulouse, France, 2006
  8. Tóth, B., Two-phase flow investigation in a cold-gas solid rocket motor model through the study of the slag accumulation process, Ph. D. thesis, Université libre de Bruxelles, Brussels, Belgium, 2008
  9. Bishop, A. A., Deshpande, S. D., Interfacial level gradient effects in horizontal Newtonian liquid-gas stratified flow-I, International Journal of Multiphase Flow, 12 (1986), 6, pp. 957-975
  10. Bishop, A. A., Deshpande, S. D., A criterion to determine uniform and non-uniform stratified liquid-gas flow through horizontal tubes, International Communications in Heat and Mass Transfer, 13 (1986), 2, pp. 209-217
  11. Taitel, Y., Dukler, A. E., Effect of pipe length on the transition boundaries for high-viscosity liquids, International Journal of Multiphase Flow, 13 (1987), 4, pp. 577-581
  12. Sadatomi, M., Kawaji, M., Lorencez, C. M., Chang, T., Prediction of liquid level distribution in horizontal gas-liquid stratified flows with interfacial level gradient, International Journal of Multiphase Flow, 19 (1993), 6, pp. 987-997
  13. Ottens, M., Hoefsloot, H. C. J., Hamersma, P. J., Correlations predicting liquid hold-up and pressure gradient in steady state (nearly) horizontal co-current gas-liquid pipe flow, Transactions of the Institution of Chemical Engineers, 79 (2001), 5, pp. 581-592
  14. Hansen, E. A., Vested, H. J., Liquid hold-up, pressure drop, and velocity profiles in steady uniform stratified flow, Journal of Energy Resources Technology, 113 (1991), 2, pp. 87-93
  15. Mandhane, J. M., Gregory, G. A., Aziz, K. A., A flow pattern map for gas-liquid flow in horizontal pipes, International Journal of Multiphase Flow, 1 (1974), 4, pp. 537-553
  16. Welch, P.D., The use of FFT for the estimation of power spectra: a method based on time averaging over short, modified periodograms, IEEE Transactions of Audio and Electroacoustics, 15 (1967), 2, pp. 70-73