Local bubble size distributions, gas–liquid interfacial areas and gas holdups in a stirred vessel with particle image velocimetry

Gas Hydrate Growth Kinetics: A Parametric Study

“…Chung et al also reported average gas phase velocities in the range of 0.03-0.2 U TIP in the radial direction, and 0.02-0.11 U TIP in the axial direction [68]. The velocities were also higher within the impeller region, reaching a maximum value around the tip of the impeller, and decreases towards the axis of rotation of the impeller and the reactor wall [66][67][68][69]. The gas hold-up in the impeller region was as high as 0.1-0.2, but decreased as we moved from the impeller in the radial direction to almost zero near the reactor wall.…”

“…It is reasonable to expect errors in measurements using this technique due to fluctuations in the liquid surface from varying flow patterns and turbulence during stirring. A number of optical imaging techniques as well as computational fluid dynamics (CFD) simulations have also been used for estimating the gas hold-up, mean bubble diameter, and the gas and liquid phase velocities [66][67][68][69]. Yang et al [66] performed gas-liquid-solid dispersion studies using CFD simulations and compared with experimental measurements in a stirred reactor.…”

Experimental Measurement of Gas-Liquid Flow Field in Up-Flow Ejectors with and without Swirl

“…Two pulses of laser generated with a time interval of T and formed a couple of pictures which were used to compute the velocity of the gas bubbles. The PIV technology has been widely used in fluid mechanics (Pan and Meng, 2001;Baldi and Yianneskis, 2003;Laakkonen et al, 2005).…”

Water Quality in Hydroelectric Sites

“…The matter is analyzed from different aspects: the velocity induced by the bubbles to the liquid (Krishna et al, 1999), (Wiemann and Mewes, 2005), (Ekambara and Dhotre, 2010), bubbles generation regimes (uniform, transient and heterogeneous) (León-Becerril et al, 2002), (Pincovschi et al, 2007), size distribution of gas bubble gas (Katerina et al, 2004), (Polli et al, 2002), Laser Doppler Anemometry and Particle Image Velocimetry measurements (Mayur et al, 2010) (Laakkonen et al, 2005), (Becke et al, 1999), (Ciocan et al, 2011), void fraction and volumetric transfer coefficient (Krishna and van Baten, 2003), numerical simulation of mass transfer (Painmanakul et al 2009), (Connie et al, 2003.…”