An improved light attenuation technique for measuring large interfacial areas

Abstract

A laser-based light attenuation technique was successfully used to measure interfacial areas as high as 5832 m2/m3 and Sauter mean bubble diameter varying between 50 and 5600 pm. Good agreement between this approach and the photographic technique was obtained particularly at low gas holdups.On a utilisC avec sucds une technique d'attknuation de la lumibre bade sur le laser afin de mesurer des surfaces interfaciales atteignant 5832 m2/m3 et le diamttre des bulles moyen de Sauter variant entre 50 et 5600 pm. Un bon accord a Ctt obtenu entre cette approche et la technique photographique particulibrement h de faibles rktentions de gaz.

Population balance simulation of gas–liquid contacting

“…The laser-based light attenuation technique developed by Kasireddy and Al Taweel (1990) was used to measure the interfacial area of contact across the diameter of the flow section and the slots enabled for the measurement of the interfacial area of contact at various axial distances downstream from each screen.…”

Mass Transfer Parameters of O2 and N2 in Cyclohexane under Elevated Pressures and Temperatures: A Statistical Approach

“…Several direct techniques, such as high-speed flash photography (Burgess and Calderbank, 1975;Veljkovic and Skala, 1988;Kasireddy and Taweel, 1990;Takahashi and Nienow, 1993) and light scattering (Calderbank, 1959;Calderbank and Moo-Young, 1961) were used to measure gas bubble size. These techniques, however, are limited to nonopaque, low-pressure, and low-temperature systems.…”

Measuring Techniques in Gas—Liquid and Gas—Liquid—Solid Reactors

“…the product aL, a being the interfacial area per volume and L the optical path length) was limited to quite small values. Work done since this period (Kasireddy & Al Taweel, 1990) has extended the possible values of aL up to much higher values (aL max = 2500). However, the bubbles have to be approximately spherical and stringent measures have to be taken to avoid parasitic light sources, electronic noise, liquid turbidity, etc.…”