Wh. Leung et al., AXIAL DEVELOPMENT OF INTERFACIAL AREA AND VOID CONCENTRATION PROFILESMEASURED BY DOUBLE-SENSOR PROBE METHOD, International journal of heat and mass transfer, 38(3), 1995, pp. 445-453
Interfacial area concentration is an important parameter in modeling t
he interfacial transfer terms in the two-fluid model. In this paper, t
he local geometric and statistical characteristics of upward cocurrent
dispersed bubbly flow in a pipe have been studied both at the entranc
e (L/D = 8) and at a region far away from the entrance (L/D = 60). The
test section was a 5.08 cm i.d. and 375 cm long Lucite pipe. Four Liq
uid flow rates ranging from 0.1 to 1.0 m s(-1) were used in combinatio
n with four different gas injection rates ranging from 0.02 to 0.1 m s
(-1). A double-sensor probe was employed to measure the radial profile
s of void fraction, interfacial area concentration, Sauter mean diamet
er, bubble velocity and bubble frequency. The wall peak of the void fr
action profile was established within a short distance from the entran
ce. The flow characteristics changed very little from the entrance reg
ion to the fully developed region except for the flow case of j(1) = 0
.1 m (s-1). The area averaged Bow quantities were also presented.