The effect of channel orientation on heat transfer and wall shear stress in the bubbly flow
O.N. Kashinsky1, V.V. Randin1,2, and A.V. Chinak1
1 Kutateladze Institute of Thermophysics SB RAS, Novosibirsk, Russia
2 Novosibirsk State University, Novosibirsk, Russia
Keywords: flat channel, gas-liquid flow, bubbles, wall friction, heat transfer coefficient
Abstract
Results of experimental investigation of heat transfer and wall friction in the upward bubble flow in a flat inclined channel are presented. Measurements were carried out in the range of superfi-cial liquid velocities of 0.3–1.1 m/s and different values of volumetric void fraction. The hydrodynamic structure was measured by means of the electrochemical method with the use of miniature friction sensors. The values of average friction and heat transfer at different channel orientation were determined. It is shown that in the bubble gas-liquid flow we can observe a significant dependence of friction and heat transfer on the angle of channel inclination.
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