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PIV and CFD measurements of internal velocity in a forming drop in a liquid-liquid system

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Author

  • Anna Timgren
  • Gun Trägårdh
  • Christian Trägårdh

Summary, in English

A PIV method has been used to determine the internal motion in an oil drop during formation and to validate a numerical simulation of the drop formation process. The PIV system included a microscope attached to the camera, which gave a focal depth of 50 µm and a possibility to measure the velocity in the centre cross section of the drop. Oil was forced through a capillary with a diameter of 200 µm into a channel with a cross-flowing continuous phase that induced a shear at the interface of the forming drop, which resulted in a rotational motion inside the drop. The angular velocity in the drop reached a maximum after 1/4 of the drop formation time and approached a steady state before drop detachment when a neck was formed above the capillary opening. The velocity of oil out of the capillary was also investigated. A clear dependence on the pressure inside the forming drop was obtained.

Department/s

  • Department of Food Technology, Engineering and Nutrition

Publishing year

2007

Language

English

Pages

1-10

Publication/Series

7th International Symposium on Particle Image Velocimetry

Document type

Conference paper

Topic

  • Food Engineering

Conference name

7th International Symposium on Particle Image Velocimetry

Conference date

2007-09-11 - 2007-09-14

Status

Published