Velocity distributions in Taylor vortex flow with imposed laminar axial flow and isothermal surface heat transfer

Optical-based experiments were carried out using the immiscible pair of liquids hexane and water in a vertically oriented Taylor–Couette reactor operated in a semibatch mode. The dispersed droplet phase (hexane) was continually fed and removed from the reactor in a closed loop setup. The continuous water phase did not enter or exit the annular gap. Four distinct flow patterns were observed including (1) a pseudo-homogenous dispersion, (2) a weakly banded regime, (3) a horizontally banded dispersion, and (4) a helical flow regime. These flow patterns can be organized into a two-dimensional regime map using the azimuthal and axial Reynolds numbers as axes. In addition, the dispersed phase holdup was found to increase monotonically with both the azimuthal and axial Reynolds numbers. The experimental observations can be explained in the context of a competition between the buoyancy-driven axial flow of hexane droplets and the wall-driven vortex flow of the continuous water phase.

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Closure to “Discussions of ‘The Effect of Taylor Vortex Flow on the Radial Forces in an Annulus Having Variable Eccentricity and Axial Flow’” (1978, ASME J. Fluids Eng., 100, pp. 377–380)

Journal of Fluids Engineering ◽

10.1115/1.3448696 ◽

1978 ◽

Vol 100 (3) ◽

pp. 380-380

Author(s):

J. E. Coney ◽

J. Atkinson

Keyword(s):

Vortex Flow ◽

Axial Flow ◽

Taylor Vortex ◽

Taylor Vortex Flow ◽

Radial Forces

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Discussion: “The Effect of Taylor Vortex Flow on the Radial Forces in an Annulus Having Variable Eccentricity and Axial Flow” (Coney, J. E., and Atkinson, J., 1978, ASME J. Fluids Eng., 100, pp. 210–214)

Journal of Fluids Engineering ◽

10.1115/1.3448693 ◽

1978 ◽

Vol 100 (3) ◽

pp. 377-378

Author(s):

J. Freˆne

Keyword(s):

Vortex Flow ◽

Axial Flow ◽

Taylor Vortex ◽

Taylor Vortex Flow ◽

Radial Forces

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The Effect of Taylor Vortex Flow on the Radial Forces in an Annulus Having Variable Eccentricity and Axial Flow

Journal of Fluids Engineering ◽

10.1115/1.3448632 ◽

1978 ◽

Vol 100 (2) ◽

pp. 210-214 ◽

Cited By ~ 1

Author(s):

J. E. R. Coney ◽

J. Atkinson

Keyword(s):

Vortex Flow ◽

Outer Cylinder ◽

Axial Flow ◽

Reynolds Numbers ◽

Radial Force ◽

Taylor Vortex ◽

Eccentric Annulus ◽

Taylor Vortex Flow ◽

Radial Forces ◽

Force Variation

Results are presented in dimensionless form as obtained in an experimental study of the resultant radial force variation in an eccentric annulus formed by a stationary outer cylinder and a rotating inner cylinder, through which an axial flow of oil may be pumped. Two eccentricity ratios, 0.5 and 0.9, and three axial Reynolds numbers for the flow of the fluid in the annulus, 0, 25, and 50, are considered. It is shown that the onset of Taylor vortex flow has a marked effect on the magnitude and direction of the resultant radial force. The resultant forces and attitude angles are compared with those derived from Sommerfeld’s journal bearing theory. Comparisons are also made between critical Taylor numbers for the present investigation and those available in the literature.

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