Abstract
The Chilowsky effect, whereby a jet initially inclined to a flat plate subsequently becomes attached to it, thereby forming an enclosed region of recirculation, has been studied. A quasi-plane cold air jet (at about 0°C) issued parallel or inclined to an adjacent adiabatic flat plate, with a slot-exit Reynolds number <5 times 103, into quiescent ambient air (at about 16°C). The temperature field in and around the jet was mapped using a 15-cm field-of-view Mach-Zehnder interferometer for a downstream distance of 90 slot widths and compared with predictions from Glauert/Seban-Back theoretical model for turbulent wall jets. Transverse velocity and temperature profiles downstream of the attachment point were found to be near-similar for inclination angles up to 40°. The attaching inclined jets exhibited two wall-temperature decay rates, similar to those observed for three-dimensional wall jets. To utilize the Chilowsky phenomenon, continuous linear air-conditioning diffusers need to be designed with exit angles of less than 50°, thereby ensuring jet attachment to the ceiling and so avoiding discomfort to human occupants.
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