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Thermophysics and Aeromechanics

2011 year, number 1

Local characteristics of the upward bubbly flow in an annular channel

O.N. Kashinsky, A.S. Kurdyumov, P.D. Lobanov
Kutateladze Institute of Thermophysics SB RAS
Keywords: bubbly flow, annular channel, void fraction, wall shear stress, electrochemical method
Pages: 37-41


Results of experimental investigation of the bubbly gas-liquid flow in a vertical annular channel are presented. The average and pulsation shear stresses and distributions of local void fraction were measured by the electrochemical method on both channel walls. It is shown that with a rise of gas flow rate ratio the value of wall shear stress increases significantly, and this effect becomes higher at a decrease in superficial liquid velocity. A presence of the gas phase effects significantly shear stress on the inner wall. Relative intensity of shear stress pulsations increases similarly on both channel walls.