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This study has been conducted to pursue heat transfer enhancement in a convective field by utilizing gas-solid suspensions controlled by a steady electric field. The gas-solid suspensions consisting of air and 40μm glass beads flowed vertically upward in a channel whose walls were subjected to high voltage potential. The observations of particle trajectories and the measurements on heat transfer rate were systematically undertaken. Firstly, the primary behaviors of charged particles under the action of the Coulomb force in an electrohydrodynamic (EHD) field were experimentally clarified. Secondly, the heat transfer rates from both surfaces of the channel wall were augmented with increasing applied voltage and loading ratio, and the mechanism of enhancement was found to correspond positively to the number density of the particles colliding with the wall surface. On the basis of the results, the availability of utilizing electric field was made clear in comparison with a single-phase flow under the constant rate of power consumption

nihon kikai gakkai ronbunshū. b

Active Heat Transfer Enhancement in a Gas-Solid Suspensions Flow by Utilizing an Electric Field. Particle Behavior and Heat Transfer in a Channel Flow.