S. Yapici et al., HYDRODYNAMICS AND MASS-TRANSFER IN DECAYING ANNULAR SWIRL FLOW, International communications in heat and mass transfer, 21(1), 1994, pp. 41-51
This paper reports an electrochemical study of local mass transfer beh
aviour in decaying annular swirl flow. Initially, flow visualisation e
xperiments were conducted to observe the general behaviour of the flow
. It was found that the swirl angle decays exponentially along the tub
e. Measurements of pressure drop across the vaned swirl generators wer
e correlated in terms of the inverse of the square of the tangent of t
he vane angle and approximately the square of the mean fluid velocity
for vane angles of 30-degrees and over. Measurements of the axial dist
ribution of local mass transfer coefficient for the inner rod were car
ried out using the electrochemical limiting diffusion current techniqu
e and results were correlated for each swirl generator, in the Reynold
s number range 3300-50000. It was found that the relative enhancement
of mass transfer in swirl flow increases as the vane angle increases a
nd Reynolds number decreases.