底吹き円筒容器内水-空気系気泡噴流中の流れ場

抄録

Bubble frequency and gas holdup in bubbling jets were measured by means of an electro-resistivity probe. The axial, radial and tangential velocity and fluctuation components of water were measured with a Laser Doppler Velocimeter. On the basis of these results, air-water vertical bubbling jet in a cylindrical vessel was classified into four regions, i.e., the momentum, transition, buoyancy, and surface regions from the nozzle exit toward the bath surface. The profiles of gas holdup, axial velocity and root mean square value of axial velocity fluctuation in each region were discussed in detail. Also, the flow rate, momentum and kinetic energy of rising water were determined, being necessary for refining previous theoretical models predicting the fluid flow behavior induced by bubbles.