Chemical and Petroleum Engineering, Vol. 54, Nos. 1–2, May, 2018 (Russian Original Nos. 1–2, Jan.–Feb., 2018)
0009-2355/18/0102-0021 ©2018 Springer Science+Business Media, LLC
National Research Tomsk Polytechnic University, Tomsk, Russia; e-mail: email@example.com. Translated from Khimicheskoe i Neftegazovoe
Mashinostroenie, No. 1, pp. 15–18, January, 2018.
ENHANCING BOILING AND EXPLOSIVE BREAKUP
OF EVAPORATING HETEROGENEOUS WATER DROPS
IN HIGH TEMPERATURE GASEOUS MEDIA
A. G. Borisova, M. V. Piskunov, and P. A. Strizhak
The inﬂ uence of the passive method of heat transfer enhancement by increasing of the surface area of solid
inclusions in water drops, on the conditions and characteristics of their boiling and breakup in conditions
of intensive vaporization, was experimentally studied. Moreover, the main characteristics of these processes
were deﬁ ned: heating time of a drop till breakup, number and total surface area of formed droplets in
comparison with the initial one (before breakup), limiting (critical) temperatures of sustainable (controlled)
breakup of water drops. The substantial inﬂ uence of artiﬁ cial surface irregularities, porous surface geometry
before and after water vaporization and inclusion shape (using the example of an irregular shape polyhedron
and a cube) on the enhancement of heat-exchange processes in the water drop – solid inclusion system and the
initiation of the explosive breakup of the liquid ﬁ lm of a heterogeneous drop was also demonstrated. Horizons
of the explosive breakup application were distinguished for systems of thermal and ﬂ ame puriﬁ cation of
water from impurities, manufacturing a syngas from water solutions, emulsions and suspensions.
Keywords: high-temperature gases, heterogeneous water drop, solid inclusion, explosive breakup, intensive
The principle of heat transfer enhancement by means of increasing the contact area between liquid and gas (or liquid
and solid) is widely used in modern heat exchange systems [1–3]: the heating rate of the liquid ﬁ lm (droplets, jets, etc.) and
the rate of its evaporation can increase many times [2, 3]. The most widely used approaches are [1–3]: the creation of artiﬁ cial
roughness; changing the porosity of the heat exchange surface (artiﬁ cial porous framework); a signiﬁ cant transformation of
the surface to increase the number of faces in contact with the liquid (for example, using polyhedral, ﬁ nned surfaces instead
of surfaces with uniform relief).
Of great interest is the enhancement of fast processes with explosive breakup of droplets, ﬁ lms, jets and other ele-
ments, since the efﬁ ciency of the operation of the relevant facilities and industries can vary signiﬁ cantly even with a slight
heat transfer enhancement [4–9].
At present, an approach is proposed to intensify the processes of evaporation of water droplets by introducing solid
opaque inclusions in them. The approach is characterized by fast-ﬂ owing processes of the boiling of water at the internal
interfacial phase boundaries and intense breakup of the liquid surrounding the inclusions. These processes are accompanied
by a multiple increase in the surface area of evaporation of the liquid in the heating chamber [10–13]. One can consider the
developed approach as one of the most promising, but the effect of artiﬁ cial roughness of the surface of inclusions, their po-
rosity and conﬁ guration on the conditions of heating and evaporation of the liquid, and on initiating the effect of its explosive
breakup has not been studied.
The purpose of this work is experimental determination of the effect of the passive method of heat transfer enhance-
ment (transformation of inclusions surface by introducing artiﬁ cial roughness, porosity, facets) in heterogeneous water