Interferometric Laser Imaging Droplet Sizer ( ILIDS )
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Application Examples
The figure below is the result obtained from a transient spray measurement. In the figure, “size-dependent velocity vector maps” are introduced for the description of spray fields. It is based on the conventional expression of velocity vector fields used in the PIV technique, but is obtained from the droplet data in a certain narrow size range. Hence, several vector maps can be extracted from the same image, but each of them is “size-dependent” and expresses the motion of the droplets in a certain size category. The vector maps show significant difference, even though they are extracted from the same image. It is observed that the droplets with their size of 20 to 30mm are introduced from the outer region to the inner region of the spray and significantly change their direction of motion in the inner region, whereas those with their size of 50 to 75mm have large velocity moving towards outside.
Size-dependent velocity vector maps obtained from measurement of transient spray.
Courtesy of Prof. Maeda at Keio University, Japan.
Carbon dioxide bubbles injected by a nozzle from the bottom dissolve in water as they ascend. The number of fringes is proportional to the bubble diameter. The data below is the evidence of dissolution as the number of fringes decreases as the bubble ascends.
The left figure below shows that the decreasing rate of the bubble diameter is almost constant. The right figure displays size-velocity correlation of the bubbles. Bubble motion is determined by buoyancy (∝ d3) and drag (∝ d2) force. The larger bubbles have greater ascending velocity.
Courtesy of Prof. Maeda at Keio University, Japan
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