GAS-LIQUID BUBBLY FLOW IN VERTICAL PIPES (DATA-BANK CONTRIBUTION)

Gas-liquid bubbly flow was investigated in vertical pipes for differen t flow conditions: fully developed turbulent downward flow in a 42.3 m m diameter pipe and upward flow in a 14.8 mm diameter pipe with liquid of elevated viscosity. Wall shear stress, local void fraction, and li quid velocity profiles, shear stress, and velocity fluctuations were m easured using an electrodiffusional method. Results obtained demonstra te the existence of ''universal'' near-wall velocity distribution in a downward bubbly flow. The reduction of turbulent fluctuations is obse rved in downward flow as compared to a single-phase turbulent flow. Th e development of bubble-induced liquid velocity fluctuations in a ''la minar'' bubbly flow was studied.