Measurement of gas holdup profiles in a gas liquid cocurrent bubble column using electrical resistance tomography

Bubble column reactors for high pressures and high temperatures operation

“…This is attributed, in counter-current mode, to an increase of friction forces between gas bubbles and liquid that results on bigger bubbles formation. At ambient conditions, Jin et al (2007b) report a decrease of the gas holdup with superficial liquid velocity only in the heterogeneous regime, not in the homogeneous regime. This is consistent with Lau et al (2004).…”

“…The transition velocity is higher for lower solution surface tension. Jin et al (2007b) report a slight increase (5.8%) of the transition velocity while increasing superficial liquid velocity (from 0 to 0.011 m.s -1 ) in a co-current bubble column at ambient pressure and temperature. This is attributed to an increased stability of the flow in cocurrent mode.…”

The use of electrical resistance tomography for the characterization of gas holdup inside a bubble column bioreactor containing activated sludge

“…An increased radial gradient has been reported as a result of increased gas velocity [56,57], increased column diameter [55], and decreased reactor pressure [58]. A lower degree of the radial profile uniformity was also reported for fluids with stronger bubble coalescing nature [23,45].…”

Electrical resistivity tomography used to characterize bubble distribution in complex aerated reactors: Development of the method and application to a semi-industrial MBR in operation

“…The measurement (MN) and injection (AB) dipoles are separated and the space between them increased gradually. If injection (AB) and measurement (MN) dipoles consist in two adjacent electrodes (e i and e i+1 ), the DD sequence is equivalent to the adjacent electrode pair strategy mentioned in papers examining EIT measurements applied to bubble columns [20,36,37]. The sequence of quadripoles must be adapted for the specific constraints related to the reactor design studied (rectangular shape of the bioreactor, electrode disposition).…”