Research Papers: Multiphase Flows

Airlift Pump With a Gradually Enlarged Segment in the Riser Tube

[+] Author and Article Information
A.-F. Mahrous

Mechanical Power Engineering Department,
Menoufiya University,
Shebin El-Kom, 32511, Egypt
e-mail: afmahrous@hotmail.co.uk

Manuscript received January 20, 2012; final manuscript received December 18, 2012; published online February 22, 2013. Assoc. Editor: Olivier Coutier-Delgosha.

J. Fluids Eng 135(3), 031301 (Feb 22, 2013) (5 pages) Paper No: FE-12-1023; doi: 10.1115/1.4023296 History: Received January 20, 2012; Revised December 18, 2012

Airlift pump is a type of deep well pumps. Sometimes, it is used for removing water from mines or pumping slurry of sand and water or other solutions. The performance of airlift pump is affected by two sets of parameters; the geometrical and operational parameters. This work suggests a way to reduce the acceleration loss followed the expansion of air phase in the riser tube of the airlift pump, and consequently minimize transition to annular flow regime that is characterized by poor pumping performance. The method is to gradually enlarge the riser tube at some points after the air injection zone. Enlarging the riser tube can be considered as an alternative way in the cases where increasing airlift tube diameter is restricted by, e.g., the design of air injection system. A numerical model of the airlift pump based on the concept of momentum balance was developed and validated against available experimental data. Parametric predictive studies on model airlift pumps with different riser tube configurations, based on position, degree of expansion ratio and length of tube graduation section, were carried out. The numerical results showed that gradually enlarging the riser tube diameter at a position near the air injection zone would significantly improve the airlift pump discharge rate. Having the enlarged section set at a certain position and increasing the degree of expansion of the gradually enlarged tube section, the predicted results illustrated an improvement in the pump discharge rate but limited by the value of tube expansion ratio. The length of the enlarged tube section is shown not to considerably contribute to the improvement in the pump output rate when gradually enlarging the riser tube.

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Shimizu, Y., Tojo, C., Suzuki, M., Takagaki, Y., and Saito, T., 1992, “A Study on the Air-Lift Pumping System for Manganese Nodule Mining,” Proc. 2nd International Offshore and Polar Engineering Conference, San Francisco, CA, pp. 490–497.
Mudde, R. F., 2005, “Gravity-Driven Bubbly Flows,” Ann. Rev. Fluid Mech., 37, pp. 393–423. [CrossRef]
Reinemann, D. J., and Timmons, M. B., 1989, “Predicting Oxygen Transfer and Total Dissolved Gas Pressure in Airlift Pumping,” Aquacultural Eng., 8, pp. 29–46. [CrossRef]
Dedegil, M. Y., 1986, “Principles of Airlift Techniques,” Encyclopedia of Fluid Mechanics, Vol. 4, Gulf Publishing Co., Houston, TX, Chap. 12.
Nenes, A., Assimacopoulos, D., Markatos, N., and Mitsoulis, E., 1996, “Simulation of Airlift Pumps for Deep Water Wells,” Can. J. Chem. Eng., 74, pp. 448–456. [CrossRef]
Clauss, G. F., 1971, “Investigation of Characteristic Data of Air Lifting in Ocean Mining (Untersuchung der Kenngröβen des Airlifts beim Einsatz im Ozeanbergbau),” Erdöl-Erdgas-Zeitschrift, 87, pp. 57–66 (in German).
Boës, C., Düring, R., and Wasserroth, E., 1972, “Airlift as a Drive for Single and Double Pipe Conveying Plants (Airlift als Antrieb für Einrohr-und Doppelrohr-Förderanlagen),” Fördern und Heben, 22(7), pp. 367–378 (in German).
Yoshinaga, T., and Sato, Y., 1996, “Performance of an Air-lift Pump for Conveying Coarse Particles,” Int, J. Multiphase Flow, 22(2), pp. 223–238. [CrossRef]
Margaris, D. P., and Papanikas, D. G., 1997, “A Generalized Gas-Liquid-Solid Three-Phase Flow Analysis for Airlift Pump Design,” ASME J. Fluids Eng., 119(4), pp. 995–1002. [CrossRef]
Hatta, N., Fujimoto, H., Isobe, M., and Kang, J., 1998, “Theoretical Analysis of Flow Characteristics of Multiphase Mixtures in a Vertical Pipe,” Int. J. Multiphase Flow, 24(4), pp. 539–561. [CrossRef]
Mahrous, A-F., 2001, “Performance of Airlift Pumps,” M.Sc. thesis, Menoufiya University, Shebin El-Kom, Egypt.
Yoshinaga, T., Sato, Y., and Sadatomi, M., 1990, “Characteristics of Air-Lift Pump for Conveying Solid Particles,” Jpn. J. Multiphase Flow, 4, pp. 174–191 (in Japanese). [CrossRef]
Weber, M., and Dedegil, Y., 1976, “Transport of Solids According to the Air-Lift Principle,” Proc. 4th International Conference on the Hydraulic Transport of Solids in Pipes, pp. H1-1–H1-23.
Lawniczak, F., Francois, P., Scrivener, O., Kastrinakis, E. G., and Nychas, S. G., 1999, “The Efficiency of Short Airlift Pumps Operating at Low Submergence Ratios,” Can. J. Chem. Eng., 77, pp. 3–10. [CrossRef]


Grahic Jump Location
Fig. 1

Flow regimes for gas-liquid two-phase flow in a vertical pipe [2]

Grahic Jump Location
Fig. 2

Model of numerically tested airlift pump

Grahic Jump Location
Fig. 3

Comparison of numerical results calculated based on present theoretical model with experimental data by Yoshinaga et al. [8,12]. Experimental conditions are DU = DD = 26 mm, LR = 6.74 m, and LS = 1.12 m.

Grahic Jump Location
Fig. 4

Comparison of numerical results calculated based on present theoretical model with experimental data by Weber and Dedegil [13]. Experimental conditions are DU = DD = 300 mm.

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Fig. 5

Effects of γ-ratio on water discharge rate (a) and maximum pump discharge (b) (LEN = 1 m, DU = 26 mm, DD = 40 mm, and α = 70%)

Grahic Jump Location
Fig. 6

Variation of gas volumetric fraction along the riser tube for the case where jGa = 11.834 m/s (LEN = 1 m, DU = 26 mm, DD = 40 mm, and α = 70%)

Grahic Jump Location
Fig. 7

Effects of expansion ratio (DD/DU) on the water discharge rate (LEN = 1 m, DU = 26 mm, γ = 25%, and α = 70%)

Grahic Jump Location
Fig. 8

Effects of enlarged section length on the water discharge rate (DU = 26 mm, DD = 40 mm, γ = 25%, and α = 70%)



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