Abstract
Transients of the hydrodynamics of the counter-current flow of air and water have been investigated experimentally in a 190-mm column packed with 25 × 25 × 2 mm Pall rings. The transients induced by a step change in liquid or gas velocity to higher or lower values have been processed by a simple first-order model. Transitions to higher phase velocities have been found in all cases to be slower than transitions to lower velocities. Transients induced by changes in gas velocity have been found in all cases to be slower than transients induced by changes in liquid velocity. Two parallel transition mechanisms have been proposed explaining qualitatively the observed behaviour which refutes the validity of the linear first-order model.
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