Begell House Inc.
Interfacial Phenomena and Heat Transfer
IPHT
2169-2785
7
3
2019
PREFACE TO SPECIAL ISSUE MULTIPHASE FLOWS AND HEAT/MASS TRANSFER
v-vi
10.1615/InterfacPhenomHeatTransfer.2020033359
Tatyana
Lyubimova
Institute of Continuous Media Mechanics, Ural Branch of Russian Academy of Sciences, Perm, Russia; Faculty of Physics, Department of Theoretical Physics, Perm State University, 15 Bukireva Str., Perm 614990, Russia
Olga N.
Goncharova
Department of Differential Equations, Altai State University, 61, st Lenina, Barnaul, 656049, Russia; Institute of Computational Modeling of the Siberian Branch of the Russian Academy of Sciences, Krasnoyarsk, Russia; Heat Transfer International Research Institute, Universite Libre de Bruxelles, Bruxelles, Belgium
Alexander L.
Kupershtokh
Lavrentyev Institute of Hydrodynamics,
Siberian Branch of Russian Academy of Science,
Novosibirsk, 630090, Russia
Multiphase Flows; Heat/Mass Transfer
PROFESSOR ALEKSEY KUZMICH REBROV ON HIS 85TH BIRTHDAY
vii-x
10.1615/InterfacPhenomHeatTransfer.2020031224
Mohamed M.
Awad
Mechanical Power Engineering Department, Faculty of Engineering, Mansoura University, Mansoura, Egypt 35516
Professor; Aleksey Kuzmich Rebrov; 85th Birthday
SIMULATION OF THE FLOW OF SUPERHEATED FLUID INTO A CLOSED VOLUME
197-208
10.1615/InterfacPhenomHeatTransfer.2019031375
Maksim V.
Alekseev
Kutateladze Institute of Thermophysics, Siberian Branch of the Russian Academy of Sciences,
Ak. Lavrenteva 1, Novosibirsk 630090, Russia
Ivan S.
Vozhakov
Kutateladze Institute of Thermophysics, Siberian Branch of the Russian Academy of Sciences,
Ak. Lavrenteva 1, Novosibirsk 630090, Russia; Novosibirsk State University, 1 Pirogova Street, Novosibirsk 630090, Russia
Sergey I.
Lezhnin
Kutateladze Institute of Thermophysics, Siberian Branch of the Russian Academy of Sciences,
Ak. Lavrenteva 1, Novosibirsk 630090, Russia; Novosibirsk State University, 1 Pirogova Street, Novosibirsk 630090, Russia
superheated liquid
pressure waves
non-equilibrium phase transition
simulation
A numerical simulation of the initial stage of the flow of a superheated fluid into a closed volume of different sizes and different distances from the nozzle to the wall was carried out. It is shown that the distance to the wall significantly affects the structure of the gas-dynamic flow. It was revealed that the distance between the nozzle and the wall affects the time for the pressure and steam content to reach quasi-stationary values.
INVESTIGATION OF THE ISOTHERMAL RHEOKINETIC POLYMERIZATION OF THE EPOXY OLIGOMER
209-215
10.1615/InterfacPhenomHeatTransfer.2019030519
Valeriy G.
Gilev
Perm State University, Bukireva St. 15, 614990, Perm, Russia
Vjacheslav S.
Chudinov
Perm State University, Bukireva St. 15, 614990, Perm, Russia
Sergei Vladimirovich
Rusakov
Perm State University, Bukireva St. 15, 614990, Perm, Russia
Aleksey V.
Kondyurin
School of Physics, University of Sydney, Sydney, New South Wales 2006, Australia
rheokinetic
epoxy resin
numerical modeling
IR-spectroscopy
The results of experimental and numerical study of the viscosity of the binder composite material based on epoxy resin L and the hardener EPH 161 during the curing reaction are presented. Rheological tests were performed on a rotating rheometer Physica MCR 501. Flow and viscosity curves measured during isothermal polymerization in the temperature range from 25 to 45°C are obtained. Time dependence of viscosity is approximated using a modified Chong's formula. Numerical analysis of temperature dependences of viscosity allowed estimation of the reaction rate constants of the polymerization process, which makes it possible to predict the behavior of the polymer during its formation. A comparison of the reaction rate constants are determined by the rheological and IR-spectroscopy methods.
ELECTROCONVECTION INSTABILITY OF POORLY CONDUCTING FLUID IN ALTERNATING ELECTRIC FIELD
217-225
10.1615/InterfacPhenomHeatTransfer.2019030611
Oleg O.
Nekrasov
Perm State University, 15 Bukireva Str., 614990, Perm, Russia
Natalya N.
Kartavykh
Perm State University, 15 Bukireva Str., 614990, Perm, Russia
electroconvection
low-mode model
electroconductive charge formation mechanism
oscillation regimes
alternating electric field
The flat horizontal layer of the poorly conducting fluid is placed in the alternating electric field and heated from above. Its behavior is investigated in the electroconvection low-mode model. The approximation in which density and conductivity of the fluid are linearly dependent on temperature is used. Linear instability is analyzed by means of the Floquet theory. The system of eight differential equations, which describe the motion of the fluid, is integrated using the Runge-Kutta-Merson fourth-order method. The marginal stability curves are plotted in coordinates "wave number -nondimensional electric parameter". The critical values of the wave number and the nondimensional electric parameter are determined for various external influence frequencies. The nonlinear regimes of the fluid flow are investigated at the critical value of the wave number. The fluid electroconvection flow intensity as a function of the nondimensional electric parameter is plotted. The various types of the oscillation regimes are discovered, and the competition regions of different electroconvection modes with various flow intensities are found.
THE EFFECT OF NORMAL VIBRATIONS ON THE STABILITY OF A THREE-LAYER FLUID SYSTEM IN ZERO GRAVITY
227-238
10.1615/InterfacPhenomHeatTransfer.2019030977
Evgeny S.
Sadilov
Institute of Continuous Media Mechanics UB RAS 1, Perm, Russia, 614013
three-fluid system
instability
zero gravity
normal vibrations
subharmonic mode
synchronous mode
parametric resonance
interfacial boundary
multiscale method
The paper is concerned with studying the instability of a three-fluid system under the influence of normal vibrations in zero gravity. It has been found that in the system with the two external layers of equal depths only the synchronous mode is in existence, whereas the subharmonic mode is absent. The instability region boundaries have been constructed.
SIMULTANEOUS IMBIBITION AND EVAPORATION OF LIQUIDS ON GROOVED SUBSTRATES
239-253
10.1615/InterfacPhenomHeatTransfer.2019031166
Tatiana
Gambaryan-Roisman
Faculty of Mechanical and Process Engineering,
Technische Universität Darmstadt,
Petersenstr. 30, 64287, Darmstadt, Germany
imbibition
evaporation
textured substrates
grooves
Imbibition of volatile liquids on textured surfaces and in porous layers governs heat and mass transport in natural phenomena and in technological applications, including thermal management of electronic devices and ink-jet printing. These processes are responsible for significant improvement of cooling efficiency during drop impact cooling and flow boiling if the surfaces to be cooled are covered by highly porous nanofiber layers. Prediction of imbibition rate in textured substrates and porous layers, especially in the presence of evaporation, is a very complicated task. The existent imbibition theories for porous media rely on the known capillary pressure and the material permeability and are only applicable for the cases where the imbibition front separates a completely saturated region from a completely dry region. The hydrodynamics and transport processes during imbibition on textured surfaces and porous layers are substantially more complicated and are not completely understood. In this work simultaneous imbibition and evaporation in a model textured substrate are described theoretically and numerically. A typical element of the model system is a single groove, along which the liquid flows under the action of capillary pressure gradient. The cross-section area occupied by the liquid varies along the groove. The shape of the liquid-gas interface and the imbibition rate are determined by the groove geometry, the properties of the liquid, the substrate wettability, and the thermal conditions. The predicted maximal imbibed length decreases with increasing of the evaporation rate. This trend agrees with the available experimental results on imbibition into porous layers.
INFLUENCE OF SURFACE PROPERTIES ON AXISYMMETRICAL OSCILLATIONS OF A CYLINDRICAL BUBBLE
255-268
10.1615/InterfacPhenomHeatTransfer.2019031147
Alexey A.
Alabuzhev
Institute of Continuous Media Mechanics UB RAS, Perm, 614018, Russia; Perm State University, Perm, 614990, Russia
free oscillations
forced oscillations
gas bubble
contact line dynamics
We consider the oscillations of an oblate gas bubble in the vibrational field with the emphasis placed on the interplay between the bubble compressibility and the contact line motion. The bubble is surrounded by an incompressible fluid and is bounded in the axial direction by two parallel solid surfaces. The velocity of the contact line is assumed to be proportional to the deviation of the contact angle from the equilibrium value. The proportionality coefficients (Hocking parameter) are different for each plate. The frequencies and damping rates of the bubble eigenmodes are studied as a function of the problem parameters. The frequency of the volume (breathing) mode of free oscillations can vanish in a certain interval of the values of the Hocking parameter. This frequency significantly depends on the gas pressure, giving rise to double response: when the external frequency is close to the eigenfrequencies of both the volume and shape modes and when the unlimited growth of the amplitude occurs irrespective of the Hocking parameter. The radial pulsations become small with increase in the gas pressure and the bubble behavior is consistent with the dynamics of an incompressible drop. Different Hocking parameters determine different damping rates, but dissipation in the whole system is determined by their total contribution.
HEAT FLUX DURING DIP-COATING OF A SUPERHEATED SUBSTRATE
269-281
10.1615/InterfacPhenomHeatTransfer.2019032623
Kai
Schweikert
Institute for Technical Thermodynamics, Technische Universität Darmstadt,
Alarich-Weiss-Str. 10, 64287 Darmstadt, Germany
Axel
Sielaff
Institute for Technical Thermodynamics, Technische Universität Darmstadt,
Alarich-Weiss-Str. 10, 64287 Darmstadt, Germany
Peter
Stephan
Institute for Technical Thermodynamics, Technische Universität Darmstadt,
Alarich-Weiss-Str. 10, 64287 Darmstadt, Germany
dip-coating
microlayer
contact line
evaporation
heat flux
thin film
We report transient heat flux calculations based on temperature measurements during dip-coating of a superheated substrate. During the withdrawal of the substrate from a pool of volatile liquid, a film of finite length forms on the substrate's surface, locally reducing the substrate temperature due to evaporation. The surface temperature of the solid substrate is measured using high-resolution infrared thermography and used as a boundary condition to calculate the transient heat flux profiles at the interface between the superheated substrate and the fluid. The shapes of these heat flux profiles are analyzed with special focus on the local heat flux in the thin film region and near the three-phase contact line. It is shown how the heat flux in both regions is dependent on wall superheat and dewetting velocity. Two evaporation regimes, namely contact line evaporation and microlayer evaporation, can be clearly distinguished by their magnitude in overall heat flux. A temperature-dependent critical velocity separates both regimes. The local heat flux in the contact line region sharply increases, when the critical velocity is exceeded. Within the thin film, the local heat flux increases with growing wall superheat and decreases with growing dewetting velocity.
HEAT TRANSFER ENHANCEMENT IN SUPERHEATED HYDROCARBONS WITH TRACES OF WATER: THE EFFECT OF PRESSURE
283-294
10.1615/InterfacPhenomHeatTransfer.2020032696
Kirill
Lukianov
Institute of Thermal Physics, Ural Branch of Russian Academy of Sciences
Artem N.
Kotov
Institute of Thermal Physics, Ural Branch, Russian Academy of Sciences, Amundsena St.
107a, Ekaterinburg 620016, Russia; Federal State Autonomous Educational Institution of Higher Education "Ural Federal
University" named after the first President of Russia B.N. Yeltsin, 620002, 19 Mira Street,
Ekaterinburg, Russia
Aleksandr A.
Starostin
Institute of Thermal Physics, Ural Branch, Russian Academy of Sciences, Amundsena St.
107a, Ekaterinburg 620016, Russia; Federal State Autonomous Educational Institution of Higher Education "Ural Federal
University" named after the first President of Russia B.N. Yeltsin, 620002, 19 Mira Street,
Ekaterinburg, Russia
Pavel V.
Skripov
Institute of Thermal Physics, Ural Branch, Russian Academy of Sciences, Amundsena St.
107a, Ekaterinburg 620016, Russia
saturated hydrocarbons
superheat
moisture traces
enhanced heat transfer
For the specific mode of pulse heating of a probe immersed in a test liquid (saturated hydrocarbon), the effect of enhancing the heat transfer through the probe surface has been revealed. The effect is caused by the addition ofa small amount of moisture to the hydrocarbon and manifests itself in the course the temperature approaching spontaneous boiling up at small values of the reduced pressure (π < 0.2), where π = p/pc and pc is the critical pressure of the hydrocarbon. The moisture content was varied from 5 ppm (initial sample) to 35 ppm (watered sample). The length of the heating pulse, depending on the conditions in the experiment, was varied from 5 to 20 ms. Based on the experimental results, we have proposed the following hypothesis: when a liquid is superheated the moisture contained in saturated hydrocarbons in the form of clusters generates its own centers of vapor-phase nucleation.