Abstract
A thermocouple and two hot-film anemometer probes in the form of an “inverted V” were used to investigate the boundary region flow formed over an inclined surface dissipating a uniform heat flux. Temperature and the longitudinal and transverse components of velocity were measured. A single longitudinal vortex system arises. It causes a spanwise variation of the temperature and velocity fields, which results in a spanwise variation of heat transfer. The spanwise mean-flow variation, or vortex system, arises first downstream for angles greater than 11°. Our local measurements permit detailed comparison with well-established disturbance mechanisms in vertical flows. Frequency filtering of periodic disturbances is again found. The beginning of transition is postulated in terms of disturbance magnitude. The location is found to depend on the distance from the leading edge, in addition to the Grashof number, in the same way as in vertical flows.
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