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Drag coefficient in a crystal suspension

By N.M.S. Hassan, M.M.K. Khan, M.G. Rasul and D.W. Rackemann


A single air bubble rising in xanthan gum crystal suspension has been studied experimentally. The suspension was made by different concentrations of xanthan gum solutions with 0.23 mm polystyrene crystal particles. Drag co-efficient data and a new correlation of drag coefficient is presented for spherical and nonspherical bubbles in non-Newtonian crystal suspension. The correlation is developed in terms of the Reynolds number, Re and the bubble shape factor, � (the ratio between the surface equivalent sphere diameter to the volume equivalent sphere diameter). The experimental drag coefficient was found to be consistent with this new predicted correlation and published data over the ranges, 0.1<Re< 200 and 1<�phi<2.5

Topics: 030607 Transport Properties and Non-Equilibrium Processes, 090408 Rheology, Crystal suspension, bubble rise velocity, drag coefficient, bubble shape factor
Publisher: University of Malaya
Year: 2008
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