CHEMICAL ENGINEERING

76 CHEMICAL ENGINEERING VOLUME 1 SOLUTIONS

Fraction of pipe occupied by slurry slugs is

1

RC 1

Assuming that the pressure drop is the sum of the pressure drops along the slugs, then:

the new pressure drop is:KfRC 1 ugn

(

l RC 1

)

DKunlRC 1 n^1

Then: rD

pressure gradient with air pressure gradient without air

D

KunlRC 1 n^1 Kunl

DRC 1 n^1

For nD 0 .15 and:RD 1

rD 2 ^0.^85 D 0. 55