Russian Journal of Applied Chemistry, 2009, Vol. 82, No. 8, pp. 1413−1419.
Pleiades Publishing, Ltd., 2009.
Original Russian Text
A.K. Rosentsvaig, Ch.S. Strashinskii, 2009, published in Zhurnal Prikladnoi Khimii, 2009, Vol. 82, No. 8, pp. 1314−1319.
PROCESSES AND EQUIPMENT
OF CHEMICAL INDUSTRY
An intensity of the heat transfer upon the boiling in
uniform liquids depends on a character of metastable
states, which inhibit a start stage of the first type
phase transfer, on thermal parameters of a heat carrier,
on a hydrodynamic regime and on physicochemical
properties of a ﬂ ow . In the course of the boiling
the emulsion with low-boiling disperse phase the heat
exchange conditions are essentially complicated since
there is high-boiling and of cause more viscous disperse
medium between a heating surface and the drops. This
promotes a transfer of the boiling forward a volume
of the disperse phase that signiﬁ cantly increases the
heat surface by an interphase surface which performs
this function. Moreover a decrease of the heat-transfer
coefﬁ cient α
is inhibited due to a premature formation
of a vapor phase.
Also it is known that an enlargement of sufﬁ ciently
small and a destruction of abundantly large drops of the
disperse phase occur in the emulsion due to energy of
dynamic and viscous forces of the ﬂ ow. At a junction of
small drops their size on the turbulent ﬂ ow can grow to
some critical value that is determines by a surface tension
force. Sufﬁ ciently coarse drops of the disperse phase
subjected to the turbulent pulsation and viscous shear
tension capable of deformation to a drop breaking in two
and rather in several parts .
Fragmentation of Low-Boiling Disperse Phase
in Turbulent Flow of Cooling Emulsion
A. K. Rosentsvaig and Ch. S. Strashinskii
Kama State Engineering Economic Academy, Naberezhnye Chelny, Russia
Received February 10, 2009
Abstract—A qualitative analysis of a character of joint heat transfer and drop fragmentation of an overheated
disperse phase at a movement of a cooling emulsion in a turbulent regime was carried out. We considered a
general model of a drop fragmentation into the emulsion volume by turbulent pulsations of the flow in view of
the presence of an excess heat energy in it. Conditions when an effect of the overheating the disperse phase exerts
a maximum resistant size of a drop relative to the fragmentation were determined.
Experimental and theoretical investigations show that
the emulsion with the low-boiling phase can signiﬁ cantly
enhance the heat transfer in comparison with any uniform
liquid that belongs to the emulsion. For example, the
emulsion of organosilicon liquids with water disperse
phase is widely used for cooling the cutting devices of
a metal thermal treatment On the basis of experimental
data was found signiﬁ cant overheating of the emulsion
and then was studied an effect of a delay of the boiling
onset ΔT. It was demonstrated that a heat removal is
intensiﬁ ed by the drop boiling of the disperse phase
with boiling temperature essentially lower than one of
a uniform medium .
Abnormal metastable state of the cooling emulsion is
explained by complex transfer character inherent to many
thermodynamic systems . Possible approaches to a
solution of the like problems are also considered in 
when in the case of a vapor explosion an understanding
multipronged and multistage process as a set of possible
mechanisms of fundamental physical phenomena and
their interrelation becomes basic.
Simulation of composition and structure of cross
transfers by a set of elementary physical phenomena.
The heat transfer by the cooling emulsions is determined
by physicochemical characteristics as well as their
temperature dependences. Under conditions of the