期刊
JOURNAL OF FOOD ENGINEERING
卷 233, 期 -, 页码 117-125出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jfoodeng.2018.04.005
关键词
Mixing; Viscoplastic fluids; Cavern; Energy saving; Impeller design
The mixing characteristics of complex non-Newtonian fluids in a cylindrical vessel without baffles are determined in this paper. The working fluid has a shear thinning behavior with yield stress modeled by the Hershel-Bulkley model. Effects of the impeller design are explored; it concerns some modifications in the blade of a Rushton turbine mounted centrally at the half of the tank. Different shapes of cuts have been introduced in the blade of impeller, namely: U-, 2U-, V- and W-cuts. We focus on the determination of flow patterns, cavern size and power consumption for various shapes and Reynolds numbers. The obtained results revealed that the cut introduced in the blade gives a reduction in power consumption accompanied with a reduction in cavern size than that obtained with the plain blade. The best compromise between energy saving and well-mixed region size allows to select the impeller with V- or W-cut blade as the best one from all cases studied. (C) 2018 Elsevier Ltd. All rights reserved.
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