Abstract
Turbulent Couette-Poiseuille flows between horizontal plates heated from below are investigated experimentally at low bulk Reynolds number Reb=1500 and low bulk Richardson number Ri=0.001 using stereo PIV, thermocouple, heat flux sensor and hot-wire thermometer. In the experimental apparatus the flow is driven by a moving plate and a blower. The lower hot plate (seamless belt) moves at several values of speed while the upper cold plate is at rest, and a bulk mean velocity is kept constant. It is found that heat transfer exhibits a local maximum at the lower plate speed for which a wall shear rate is null. In this specific condition turbulence decays in the vicinity of the lower hot plate so that vortical structures stemming from the upper cold plate may attain to the vicinity of the lower plate to carry low-temperature fluids, enhancing heat transfer. In the experiment, this phenomenon is observed by intermittent low-temperature fluctuation in the vicinity of the lower plate.
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