ISSN 1068-798X, Russian Engineering Research, 2018, Vol. 38, No. 2, pp. 135–137. © Allerton Press, Inc., 2018.
Original Russian Text © G.S. Mazlumyan, V.B. Borisevich, V.I. Balovnev, A.G. Savel’ev, O.A. Valyaev, 2017, published in STIN, 2017, No. 8, pp. 29–32.
Magnetic Liquids in Manufacturing Systems
G. S. Mazlumyan*, V. B. Borisevich**, V. I. Balovnev***,
A. G. Savel’ev****, and O. A. Valyaev*****
MADI State Technical University of Automobiles and Roads, Moscow, Russia
Abstract—Theoretical and experimental principles are outlined for the creation of equipment and manufac-
turing systems that employ magnetic fluids, for use in the auto industry and elsewhere.
Keywords: magnetic fluids, nanomaterials, industrial equipment, manufacturing systems, auto industry
Magnetic fluids are two-phase systems character-
ized by fluidity and high sensitivity to external mag-
netic fields. They take the form of colloidal solutions
of small magnetic particles in a liquid medium. They
are not encountered in nature. The smallest magnetic
particles correspond to the critical domain size of the
material from which they are made: 10
Since 1017 particles are present in 1 cm
, the force on
each particle is transmitted to the adjacent liquid layer
by viscous friction, and the whole solution moves in a
unified manner within the magnetic field [1, 2]. Mag-
netic fluids may be characterized as nanomaterials,
within the established terminology .
Three basic types of magnetic fluid are known:
(1) ferrofluids; (2) magnetorheological suspensions;
(3) magnetic composites [1, 2]. Ferrofluids (ferromag-
netic fluids) are magnetic fluids with particles measur-
m. They are colloidal solutions of ferro-
magnetic particles in liquid. Magnetorheological sus-
pensions are magnetic fluids with particles measuring
m. They take the form of suspensions of
noncolloidal multidomain particles in a liquid .
The magnetic properties of such fluids depend on
the concentration of magnetic particles and the
strength of the external magnetic field. The rheologi-
cal properties of the magnetic fluid (in particular, its
effective viscosity) depend on the shear flow rate of the
fluid and the external magnetic field strength [1, 2].
In developing a hybrid power unit (Fig. 1) and a
system for heat production and conversion on the
basis of magnetic fluid, attention focuses on the selec-
tion of the best parameters and structures of the pro-
spective system for heat production and conversion
from diesel generators that employ magnetic fluids
and cold storage batteries.
The proposed hybrid power unit based on magnetic
fluid permits the return of some of the heat from the
exhaust gases and cooling gas to the working cycle.
Taking account of the hybrid power unit’s structure
and the corresponding thermal-energy distribution,
we may develop a mathematical model of the power
unit. It takes the form of an expression for the relative
increment in the power unit’s efficiency
is the efficiency of the hybrid power unit
with the system for heat production and conversion;
is the efficiency of a power unit with a vacuum
evaporative cooling system.
In general form, the relative increment in the
power unit’s efficiency is
where is the heat transmitted from the heater of
the power unit with a system for heat production and
conversion to the working fluid; Q
components of the heat removed from the power
unit’s working fluid by the cooling fluid, by the
exhaust gases, and by other means to the surround-
is the efficiency of the steam power unit; η
η+ η− ηη
SHPC CS CS
cf eg eg eg
КТ spu cu
SHPC SHPC SHPC
wf wf wf
cf eg su
QQ Q Q