Premium
Lateral mixing of shallow liquid pools by air bubbling
Author(s) -
Baird Malcolm H. I.,
Rao Nadella V. Rama
Publication year - 2000
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.5450780126
Subject(s) - mixing (physics) , mechanics , materials science , flow (mathematics) , dissipation , volumetric flow rate , power (physics) , spark plug , geology , environmental science , thermodynamics , physics , quantum mechanics
Abstract The lateral mixing of water in a shallow rectangular tank (length 225 cm, width 56.5 cm, depth 15 cm) under the action of bottom‐stir plugs has been studied. The process has been measured and video‐recorded, using an acid‐base reaction with indicator to show the flow patterns. It is concluded that in spite of the very low depth/width ratio in the tank, lateral mixing can be achieved quite efficiently using certain configurations of plugs which promote lateral circulation. With the best configuration, a mixing time of about 3.5 min could be achieved using either 4 or 6 plugs. The specific power dissipation rate was very low (0.0044 W/kg). The mixing time was essentially the same with 4 or 6 plugs provided the total gas flow to the plugs was the same in the two cases. Tests with intermittent blowing of the plugs did not show any improvements over steady operation.