1976 Volume 2 Issue 3 Pages 235-242
Measurements were made of axial dispersion coefficient of liquid and liquid holdup in gas-liquid flow through a column packed with spherical particles or Raschig rings.
The concentration of potassium chloride solution chosen as tracer was successfully measured by a potentiometric method using Ag/AgCl electrode. The parameters in an axial dispersion model were estimated by a nonlinear least squares method from response curves at two axial points for an imperfect pulse.
Axial dispersion coefficients of liquid phase, Ez, were correlated by
uLde/Ez=0.156Ψ (Ψ≤4.2)
uLde/Ez=0.66 (Ψ>4.2)
where Ψ= (deuLρL/μL) 0.695 (de3gρL2/μL2) -0.225
Liquid holdup data were represented by the following equations for the trickling flow region : αL= {0.13 (Spheres) (0.038/ε) dp-1 (Rings)} +28.8 (deGL/μL) 0.876 (de3gρL2) -0.608
and for the pulsing and the bubbling flow regions :
αL=0.138 (αs/ε) 1/3χ0.24