Research Papers: Fundamental Issues and Canonical Flows

PIV Study of Laminar Wall Jets of Non-Newtonian Fluids

[+] Author and Article Information
K. F. K. Adane, M. F. Tachie

Department of Mechanical and Manufacturing, University of Manitoba, Winnipeg, MB, R3T 5V6, Canada

J. Fluids Eng 132(7), 071201 (Jul 08, 2010) (8 pages) doi:10.1115/1.4001894 History: Received September 09, 2009; Revised May 11, 2010; Published July 08, 2010; Online July 08, 2010

Three-dimensional laminar wall jet flows of shear-thinning non-Newtonian fluids have been studied using a particle image velocimetry technique. The non-Newtonian fluids were prepared from xanthan gum solutions of various concentrations. The velocity measurements were performed in various streamwise-transverse and streamwise-spanwise planes at various inlet Reynolds numbers. From these measurements, the maximum velocity decay, jet half-widths, and velocity profiles were obtained to study the effects of Reynolds number and fluid type on the characteristics of the wall jet flows. It was observed that the maximum velocity decay and jet half-widths depend on inlet Reynolds number and fluid but the similarity velocities profiles are independent of both Reynolds number and specific fluid type.

Copyright © 2010 by American Society of Mechanical Engineers
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Figure 1

Typical similarity profile for a 3D wall jet and flow nomenclature

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Figure 2

Shear viscosity data of the test fluids

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Figure 3

(a) Picture and (b) schematic diagram of the experimental setup

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Figure 4

Velocity vectors in various regions to demonstrate Reynolds number effects: (ad) 0≤X≤6, (eh) 40≤X≤46 at Rej=250 (a, c, e, g) and 800 (b, d, f, h) for (a and b, e and f) XG005 and (c and d, g and h) XG010 fluids in symmetry plane. Note that a reference vector is indicated on each plot.

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Figure 5

Velocity vectors at Rej=800 to demonstrate fluid effects in two regions of flow development in the symmetry plane (af) and spanwise plane (gl): (ac, gi) 0≤X≤6 and (df, jl) 40≤X≤46. (a, d, g, j) Newtonian fluid, (b, e, h, k) XG005, and (c, f, i, l) XG010. Note that a reference vector is indicated on each vector plot in the symmetry plane (af). The reference vectors in the spanwise plane (gl) are the same as those in the corresponding symmetry planes.

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Figure 6

Variation in maximum velocity decay, um (a, b), and jet half-widths, z0.5 (c, d), and y0.5 (e, f) in the streamwise direction at various Rej for XG005 (a, c, e) and XG010 (b, d, f).

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Figure 7

Comparison of maximum velocity decay, um (a, b), z0.5 (c, d) and y0.5 (e, f) for various fluids at Rej=250 and 420 (a, c, e), and at Rej=800 (b, d, f). Note that the dash line indicates the origin for Rej=250 values. The uncertainties are ±3.5% and ±9.5% for Um and jet half-widths (Z0.5 and Y0.5), respectively.

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Figure 8

Normalized streamwise velocity profiles in transverse direction at various downstream locations for XG005 (a, c, e) and XG010 (b, d, f). Note: The uncertainty in the velocity is ±3.5% in the region Z′≤1.2.

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Figure 9

Normalized streamwise velocity profiles in spanwise direction at various downstream locations for XG005 (a, c, e) and XG010 (b, d, f). Note: The uncertainty in the velocity is ±3.5% in the region Y′≤1.2.

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Figure 10

Comparison of similarity velocity profiles for various fluids




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