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Dissolution mass transfer in a turbine agitated baffled vessel
Author(s) -
Nienow A. W.
Publication year - 1969
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.5450470316
Subject(s) - impeller , mass transfer , mechanics , materials science , dissolution , particle size , suspension (topology) , turbine , rushton turbine , mass transfer coefficient , range (aeronautics) , particle (ecology) , particle density , thermodynamics , chemistry , composite material , physics , mathematics , geology , homotopy , volume (thermodynamics) , pure mathematics , oceanography
Abstract Mass transfer coefficients were measured for the dissolution of crystalline electrolytes suspended in a baffled vessel by means of disc turbines. A 3‐fold range of density differences, a 5‐fold range of diffusivities and a 50‐fold range of particle size were covered and the effect of impeller speed, size and clearance from the base was studied. The increase in coefficent with speed is both a function of the clearance and solid density and size and is difficult to quantify. However, in the most economic configuration of small clearance and large impeller, this is not of great importance since the coefficient increases but slowly with speed and the minimum suspended coefficient can be calculated. This is done by means of a slip velocity theory which has been extended to include larger particles, which allows for the effect of concentration dependent physical properties and which is based on the impeller speed at which particle suspension occurs.