This work was undertaken, with a view to studying the effects which physical properties of liquid … viscosity, surface tension, etc, … have on the wetted area in a packed column. The wetted area for 15-, 25- and 35-mm paper Raschig rings in a 5-in, column was measured by the same method as used by Mayo, Hunter and Nash. Gas rate, up to the loading point, had no measurable effect on it. The values of the wetted area were found to be in agreement with those obtained without gas flow, as shown in Fig. 1.
In this report the values of the fractional wetted area,
aw/at, are plotted on logarithmic scales against the liquid rate, L, with surface tension,
σ, or viscosity,
μ, as parameter. Data are represented by straight lines having the same slope of 1/3, as shown in Fig. 2-6.
For the range of surface tension from 30 to 65 dyne/cm, the fractional wetted area was proportional to
σm, and the values of
m were -1.07, -0.75 and -0.59 for 15-, 25- and 35-mm rings respectively.
Liquid viscosity had no effect on the wetted area for the range from 0.9 to 3.8c.p., as shown in Fig. 5.
Fig. 9 is the final correlation and shows the values of aw/at plotted against the values of the product
L·(σ/20)3m. All data points fall within ±10% of a single straight line represented by Equations (3') and (4).
The values of
aw/at obtained by the previous investigators are shown in Fig. 12, in comparison with the present data. The data by Fujita and Sakuma and those by Mayo, Hunter and Nash show good agreement with the present ones.
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