PROCESSES AND DEVICES
OF CHEMICAL MANUFACTURES
Russian Journal of Applied Chemistry, 2010, Vol. 83, No. 12, pp. 2229−2239.
Pleiades Publishing, Ltd., 2010.
Original Russian Text
I.O. Mikulionok, 2010, published in Khimicheskaya Promyshlennost’, 2010, Vol. 86, No. 6, pp. 306−316.
Simulation of Processing the “Power” Composition
in a Mixer with Oval Rotors
I. O. Mikulionok
Ukrainian Technical University “Kyiv Polytechnical Institute”, Kiev, Ukraine
Received August 5, 2010
Abstract— The main dependence for determining the energy-power parameters of processing the compositions,
whose behavior under load is described by a power rheological law in the operation gap of mixers with oval rotors.
In the proposed method of calculating the power of the mixer drive motor an attempt was made to account for
movement of a treated material not only in circular but also in the axial direction of the mixing chamber. These
dependences for determining the pressure and power supplied to the rotors for rotation thereof may be recommended
for engineering calculations of mixing equipment for plastics and rubber mixtures.
Rotary mixers are one of the main types of equipment
in manufactures of products based on macromolecular
compounds: tires, rubber products, conveyor belts,
linoleum, etc. A body of the rotory mixer comprises
a chamber in a cross-section made in the form of eight.
In every part of the chamber two rotors, more often in
the form of transformed oval, rotate toward each other.
That is why these mixers are also known as mixers with
oval rotors [1–8] (Fig. 1).
An operation part of the every oval rotor of the mixer
was made in a form of an intermittent helix thereby in
any cross-section the speciﬁ ed part represents an oval
tapering in one direction. A surface of each of the rotors is
formed by two helical blades, one of which, the longer, is
of an angle of ascent helix α
= 60º, and another, the short
blade, of α
= 60º. An angle of blade twisting is usually
90º. The length of the short blade l
(more precisely the
length of its projection on the center plane of the rotor) is
from about 38 to 43% of the total length of the working
part of the rotor l (the length of the mixing chamber), and
the length of the long blade l
, approximately 70% of the
value l. The helix of the short blade has a left direction,
and one of the long blade, the right direction (Fig. 2).
Considered rotor conﬁ guration promotes the mixing
effect. The location of the rotors in the chamber is
following: the long blade of one rotor is located against
a short blade of second one. Because of this, as well as
different speed of the rotors, the processed mixture in
the chamber moves by a complicated trajectory of ﬁ gure
The rotors rotate towards one another in the space
bounded by a wall of the working chamber (half-
chamber of both rotors), as well as by upper and lower
Fig. 1. Scheme of processing the composition in the mixer
chamber. (1) Rotors; (2) operation chamber; (3, 4) upper
and lower closures; (І–VІ) characteristic regions of strain
) and (ω
) angular velocity of a high-speed and
low speed rotors, rad/s.