Visualization of Unsteady Flow in Rotating Drums
Flow visualization studies were conducted on the unsteady flow of heat and fluid in rotating drums resulting from a sudden acceleration/deceleration, both with and without a sudden application of inner surface heating. The drum consisted of an inner cylinder, an outer cylinder, and two circular plates for the side walls. The outer cylinder and side walls were transparent to allow observation. A flexible electrical heater was attached uniformly to the inner cylinder. Water and aqueous solution of glycerin at various concentrations were used as the fluid in the drum. Different methods were employed to observe unsteady recirculating flow: (1) a laser light sheet with double-exposure photography, (2) temperature-sensitive liquid crystal combined with image processing, (3) laser Doppler velocimetry, (4) temperature measurements with thermocouples. The flow patterns and temperature distributions thus obtained were compared with each other.
KeywordsSurface Heating Unsteady Flow Circular Plate Outer Cylinder Laser Doppler Velocimetry
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