Normalized characteristics of laser-Induced diffusion of arsenic dopants in silicon

Abstract EN

This work studies the effect of liquid properties (water, solution 0.2-1.5 wt % for each of i-propanol, and n-butane), temperature (26-55 oC) and superficial air velocity (1-15cm / s) on the gas holdup and mass transfer coefficient in air-liquid dispersion column.

The experimental procedure was carried out by QVF column (10 cm i.

d, 1.5 m height) and air bubbling by multi-orifice distributor (2 mm, 49 holes in square pitch).

The experimental results are presented in two and three dimension graphs, these graphs indicate, increases in holdup and mass transfer coefficient with increasing weight percent of alcohols, temperature, and superficial velocity of air.

The gas holdup and mass transfer coefficient are in the following order n-butane > i-propanol > water.

Also the experimental results were correlated by fitting empirical correlations.

Some of the results have been correlated on the basis of drift flux model in order to express the effect of surface active agent on radial uniformity flow and gas holdup profiles.