Influence of the Sequence of Rotor Apparatus Cylinders Disposition on Certain Laws Governing the Apparatus Operation
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Journal of Engineering Physics and Thermophysics, Vol. 93, No. 5, September, 2020
INFLUENCE OF THE SEQUENCE OF ROTOR APPARATUS CYLINDERS DISPOSITION ON CERTAIN LAWS GOVERNING THE APPARATUS OPERATION A. A. Kukhlenko and M. S. Vasilishin
UDC 661.11
Theoretical and experimental investigations were carried out on determination of the effect exerted by the geometrical parameters of the operational elements of a multicylinder rotor apparatus, regime parameters of processing and flow rate of the processed medium on the disperse composition of the droplets of emulsions formed in the radial clearance between the cylinders of the rotor and stator. It has been established that the power dissipation in the radial clearance of the apparatus depends greatly both on the order of cylinders disposition in the operational elements of the apparatus and on the flow rate of processed medium. The greatest efficiency of the process of emulsification in the rotor apparatus is attained under conditions where the circumferential velocity profile has a large curvature near the rotor surface. It has been established that obtaining such kind of profile is enhanced by an increase in the rate of flow of the processed medium through the apparatus in the case if the inner cylinder in the "rotor–stator" pair is the cylinder of the stator, and conversely by a decrease in the rate of flow if the inner cylinder is the cylinder of the rotor. Keywords: rotor apparatus, emulsification, flow in the clearance, power dissipation, diameter of droplets. Introduction. The process of obtaining true emulsions of various purpose is one of the most widespread in chemical, pharmaceutical, food, and other branches of industry. At the present time, for preparing emulsions various types of facilities are used differing by both production and by the efficiency of action on the processed medium. Among these are rotor apparatuses with periodical stoppage of flow [1, 2]. The operational elements of such apparatuses are hollow cylinders of the rotor and stator located coaxially inside the casing and separated by small radial clearances. On the side surfaces of the cylinders, there are radial channels for the passage of processed medium. During rotation of the rotor the channels of the rotor and stator either match with one another, or overlap by side walls, as a result of which considerable alternating pressure pulsations, hydraulic shock, and cavitation appear in the liquid, which favors the collapse of the disperse phase droplets. A marked effect on the formation of the disperse composition of droplets is also exerted by shear stresses in the liquid that occur in the radial clearance between the cylinders of the operational elements of the rotor apparatus. A great number of works is devoted to the study of various aspects of operation of such facilities [1–6]. Rotor apparatuses differ noticeably from one another in both geometric dimensions of operational elements and in their quantity and the proper sequence of the rotor and stator cylinders. Such a variety of constr
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