Hydrodynamic behavior of a trickle bed reactor under “forced” pulsing flow

Slow-mode induced pulsing in trickle beds at elevated temperature for (non-)Newtonian liquids

“…By now, the reported work on the hydrodynamics of periodically operated TBR is still scanty. Xiao et al (2001) studied the effect of gas flow modulation on liquid distribution and liquid holdup at ambient conditions and observed more uniform liquid distribution and lower liquid holdup during forced gas input. Boelhouwer et al (2002b) introduced two feed strategies-slow mode and fast mode-and measured ambient liquid holdup and shock wave characteristics (shock wave velocity, shock wave tail, shock wave plateau, and pulse frequency) under liquid-induced pulsing flow for different particle sizes using an electrical conductance technique.…”

Removal of Cyanides from Water by Air Oxidation in a Cocurrent Downflow Fixed Bed Reactor

“…Therefore, the decrease in yield may be explained by the onset of channelling at high gas flow rates, especially as wall flow in the bed, and the consequent decrease in contact efficiency between the gas and the liquid streams. It is known that the voidage near the wall is higher and the resistance to flow is lower than that in the center of the column [23,24]. As gas flow rate is increased, and hence the voidage in the center is lowered, it may be assumed that the gas prefers the flow near the wall.…”

Periodic Operation of Three — Phase Catalytic Reactors

“…There have been a number of experimental studies which have identifi ed the variables that control the trickle or bubble fl ow to pulsing fl ow transition (see for example, Blok and Drinkenburg, 1982;Blok et al, 1983;Wammes et al,1990;Jiricny and Stanek, 1990;Tsochatzidis and Karabelas, 1995;Jiricny and Stanek, 1996;Xiao et al 2001;Giakoumakis et al 2001, Boelhouwer et al, 1999, 2001. These variables are the gas and liquid loading, their ratio, viscosities, densities and surface tensions usually in the form of ratios.…”