Micro-PIV measurement and CFD analysis of a thin liquid flow between rotating and stationary disks |
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Authors: | Ho-Joon Lee Koichi Nishino |
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Institution: | (1) Department of Mechanical Engineering, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan; |
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Abstract: | 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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