Flow of Newtonian and non-Newtonian fluids in a concentric annulus with rotation of the inner cylinder

Journal Article · Thu Dec 01 04:00:00 EST 1994 · Journal of Fluids Engineering; (United States)

DOI:https://doi.org/10.1115/1.2911856· OSTI ID:6626488

Nouri, J M; Whitelaw, J H ^[1]

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1. Imperial Coll. of Science, Technology and Medicine, London (United Kingdom). Mechanical Engineering Dept.

Mean velocity and the corresponding Reynolds shear stresses of Newtonian and non-Newtonian fluids have been measured in a fully developed concentric flow with a diameter ratio of 0.5 and at an inner cylinder rotational speed of 300 rpm. With the Newtonian fluid in laminar flow the effects of the inner shaft rotation were a uniform increase in the drag coefficient by about 28%, a flatter and less skewed axial mean velocity and a swirl profile with a narrow boundary close to the inner wall with a thickness of about 22% of the gap between the pipes. These effects reduced gradually with bulk flow Reynolds number so that, in the turbulent flow region with a Rossby number of 10, the drag coefficient and profiles of axial mean velocity with and without rotation were similar. The intensity of the turbulence quantities was enhanced by rotation particularly close to the inner wall at a Reynolds number of 9,000 and was similar t that of the nonrotating flow at the higher Reynolds number. The effects of the rotation with the 0.2% CMC solution were similar to those of the Newtonian fluids but smaller in magnitude since the Rossby number with the CMC solution is considerably higher for a similar Reynolds number. Comparison between the results of the Newtonian and non-Newtonian fluids with rotation at a Reynolds number of 9,000 showed similar features to those of nonrotating flows with an extension of non-turbulent flow, a drag reduction of up to 67%, and suppression of all fluctuation velocities compared with Newtonian values particularly the cross-flow components. The results also showed that the swirl velocity profiles of both fluids were the same at a similar Rossby number.

• OSTI ID: 6626488
• Journal Information: Journal of Fluids Engineering; (United States), Journal Name: Journal of Fluids Engineering; (United States) Vol. 116:4; ISSN JFEGA4; ISSN 0098-2202
• Country of Publication: United States
• Language: English

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