Flow of a low concentration polyacrylamide fluid solution in a channel with a flat plate obstruction at the entry

M.A. Kabir; M.M.K. Khan; M.G. Rasul

Korea-Australia Rheology Journal, Vol.16, No.2, 63-73, June, 2004

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Flow of a low concentration polyacrylamide fluid solution in a channel with a flat plate obstruction at the entry

M.A. Kabir, M.M.K. Khan^†, and M.G. Rasul

James Goldston Faculty of Engineering and Physical Systems, Central Queensland University, Rockhampton, Qld-4702, Australia

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Flow in a channel with an obstruction at the entry can be reverse, stagnant or forward depending on the position of the obstruction. These flow phenomena have potential applications in the control of energy and various flows in process engineering. Parameters that affect this flow inside and around the test channel are the gap (g) between the obstruction geometry and the test channel, the Reynolds number (Re) and the length (L) of the test channel. The influence of these parameters on the flow behavior was investigated using a flat plate obstruction at the entry of the channel. A low concentration polyacrylamide solution (0.018% by weight) showing a powerlaw fluid behavior was used as the fluid in this investigation. The flow phenomena were investigated by the velocity measurement and the flow visualization and their results were compared with numerical simulation. These results of low concentration polyacrylamide solution are also compared with the results of water published elsewhere (Kabir et al., 2003). The maximum reverse flow inside the test channel observed was 20% - 30% of the outside test channel velocity at a g/w (gap to width) ratio of 1 for Reynolds numbers of 1000 to 3500. The influence of the test channel length (L) and the Reynolds number (Re) on the velocity ratio (V_i/V_o: inside velocity/outside velocity in the test channel) are also presented and discussed here.

Keywords:power-law fluid;reverse flow;forward flow;Reynolds number and test channel

[References]

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Kabir MA, Khan MMK, Rasul MG, Flow of Water in a Channel with Various obstruction Geometries at the Entry, The 2nd World Engineering Congress, Sarawak, Malaysia (2002)
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[1] Bearman PW, Obasaju ED, J. Fluid Mech., 119, 297 (1982)

[2] Bearman PW, Trueman DM, An Investigation of the Flow around Rectangular Cylinders, Aeronautical Quart, 23, 229-237 (1972)

[3] Bhuiyan MA, Khan MMK, Kabir MA, Reverse Flow of a Non-Newtonian Fluid in a Channel, Rheology Congress, Cambridge, U.K. (2000)

[4] Boger DB, Walters K, Rheological Phenomena in Focus, Elsevier, New York (1993)

[5] Davidson D, Graessley WW, Schowalter WR, J. Non-Newton. Fluid Mech., 49, 317 (1993)

[6] Davis CG, Sorenson KE, Handbook of Applied Hydraulics, Toranto, McGraw-Hill, Co. (1969)

[7] Eom K, J. Fluid Eng., 100, 16 (1988)

[8] Gowda BHL, Tulapurkara EG, J. Fluid Mech., 204, 229 (1989)

[9] Hutchison JW, ISA Handbook of Control Valves (1976)

[10] Kabir MA, Khan MMK, Bhuiyan MA, KSME Int. J. Korea, 17(6), 879 (2003)

[11] Kabir MA, Khan MMK, Rasul MG, Flow of Water in a Channel with Various obstruction Geometries at the Entry, The 2nd World Engineering Congress, Sarawak, Malaysia (2002)

[12] Liu J, Stability of Viscous and Viscoelastic Flows through Periodically Constricted Channels, SIT, USA, 1-35 (1999)

[13] Mills R, Sheridan J, Hourigan K, Welsh MC, The Mechanism Controlling Vortex Shedding from Rectangular bluff Bodies, Twelfth Australiasian Fluid Mechanics Conference, The University of Sydney, Australia (1995)

[14] Patankar SV, Numerical Heat Transfer and Fluid Flow, Sydney, McGraw-Hill Book Company (1980)

[15] Streeter VL, Handbook of Fluid Dynamics, McGraw-Hill Co. (1961)

[16] Unal MF, Rockwell D, J. Fluid Mech., 190, 491 (1988)

[17] Unal MF, Rockwell D, J. Fluid Mech., 190, 513 (1988)

[18] Vennard and Street, Elementary Fluid Mechanics, Brisbane, John Wiley & Sons (1982)