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Micro-PIV measurement and CFD analysis of a thin liquid flow between rotating and stationary disks

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Abstract

A strongly sheared flow in a thin liquid layer between rotating and stationary disks is studied experimentally and numerically to clarify the characteristics of the flow in rotation-shearing chemical reactors. The disk diameter is 10 mm and the separation between the disks is 500 μm. The rotational speeds that are examined are 300, 500 and 700 rpm. The micro-PIV technique is used to measure the velocity in the liquid layer. A commercial CFD software is also used to obtain the results for the comparison and validation purposes. The overall velocity distributions revealed by the micro-PIV measurement are in good agreement with the CFD results. Both results show some interesting characteristics of the flow field, including the presence of a secondary flow and its influence on the tangential velocity profiles. The near-wall measurement in the micro-PIV technique is appreciably improved by the use of a simple digital, high-pass filtering technique that is applied to the acquired particle images. It is found that the flow characteristics in the thin liquid layer can be evaluated efficiently if the micro-PIV technique is used together with the high-pass filtering technique that is examined here.

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Abbreviations

d p :

Particle diameter

f :

Spatial frequency

f cutoff :

Cutoff frequency

f x , f y :

Horizontal and vertical spatial frequencies

H :

Height between the rotating and stationary disks

H(f x , f y ):

Desired frequency response

NA:

Numerical aperture

n :

Index of refraction

R :

Radius of the rotating disk

r :

Radial coordinate measured from the axis of rotation

V :

Velocity magnitude

V r :

Radial velocity component

V θ :

Tangential velocity component

z :

Axial coordinate measured from the rotating disk surface

λ :

Wavelength of the light

ω :

Angular rotation speed

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Acknowledgments

The authors would like to thank for the financial support by the City Area Program (2007–2009) of the Ministry of Education, Culture, Sports, Science and Technology, Japan.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama, 240-8501, Japan

    Ho-Joon Lee & Koichi Nishino

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  1. Ho-Joon Lee
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  2. Koichi Nishino
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Correspondence to Koichi Nishino.

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Lee, HJ., Nishino, K. Micro-PIV measurement and CFD analysis of a thin liquid flow between rotating and stationary disks. J Vis 14, 249–258 (2011). https://doi.org/10.1007/s12650-011-0082-1

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  • DOI: https://doi.org/10.1007/s12650-011-0082-1

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