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Visualization of heat transfer enhancement regions modified by the interaction of inclined impinging jets into crossflow

Fornalik E.

Machine Graphics and Vision

1999

Vol. 8, No. 4

597-609

Visualization of heat transfer enhancement regions was made for a pair of jets obliquely discharged into a crossflow. The examination of interaction between the two oblique jets and the comparision of different flow patterns caused by the vertically and obliquely issued jets were provided. The temperatures of the target surface were visualized with thermochromic liquid crystal sheets. The colours of the liquid crystal image taken by a CCD camera were transformed accurately and effectively into the temperatures by meas of the neural network technique to obtain Nusselt number distributions on the target surface. Fluorescent dyes were added to the jet fluid to visualize the cross--sectional flow patterns with the light sheet of a laser. The moist important parameter used in the present study was the velocity ratio V R of the jet to the crossflow besides the crossflow Reynolds number.