Begell House Inc.
Interfacial Phenomena and Heat Transfer
IPHT
2169-2785
5
3
2017
PREFACE: FOUNDER OF THE URAL SCHOOL OF THERMAL PHYSICS: TO THE 90TH ANNIVERSARY OF THE BIRTH OF ACADEMICIAN VLADIMIR SKRIPOV
v-x
10.1615/InterfacPhenomHeatTransfer.2018026344
Natalia A.
Kupershtokh
Institute of History, Siberian Branch of the Russian Academy of Sciences, 8, Nikolaev Str.,
Novosibirsk, 630090, Russia
Vladimir G.
Baidakov
Institute of Thermal Physics, Ural Branch of Russian Academy of Sciences, Ekaterinburg, 620016, Russia
Academician Vladimir Skripov
metastable states
METASTABLE STATES OF WARM DENSE HYDROGEN
165-171
10.1615/InterfacPhenomHeatTransfer.2018025458
Genri E.
Norman
The National Research University Higher School of Economics, Myasnitskaya Street 20,
Moscow, 101000, Russia; Joint Institute for High Temperatures of RAS, Izhorskaya Street 13 Bld. 2, Moscow, 125412, Russia; Moscow Institute of Physics and Technology (State University), Institutskiy Per. 9, Dolgoprudny, Moscow Region, 141700, Russia
Ilnur M.
Saitov
The National Research University Higher School of Economics, Myasnitskaya Street 20,
Moscow, 101000, Russia; Joint Institute for High Temperatures of RAS, Izhorskaya Street 13 Bld. 2, Moscow, 125412, Russia; Moscow Institute of Physics and Technology (State University), Institutskiy Per. 9, Dolgoprudny, Moscow Region, 141700, Russia
Roman A.
Sartan
Joint Institute for High Temperatures of RAS, Izhorskaya Street 13 Bld. 2, Moscow, 125412,
Russia; Moscow Institute of Physics and Technology (State University), Institutskiy Per. 9, Dolgoprudny, Moscow Region, 141700, Russia
metastable states
plasma phase transition
density functional theory
Warm dense hydrogen is investigated by ab initio molecular dynamics simulations in the region of fluid–fluid phase
transition. The method of getting adjacent metastable states is developed. The metastable states are successfully obtained in the region of densities from 0.920 to 0.970 g/cm3 and pressures from 1850 kbar to 2150 kbar along an example of 1000 K isotherm. The states have similar pair correlation function as equilibrium ones before the transition. The existence of metastable states provides possible physical reasons of the remarkable differences between phase transition parameters obtained by three experimental groups.
DESCRIPTION OF THE METASTABLE LIQUID REGION WITH QUINTIC AND QUASI-QUINTIC EQUATION OF STATES
173-185
10.1615/InterfacPhenomHeatTransfer.2018025457
Attila R.
Imre
Department of Energy Engineering, Budapest University of Technology and Economics,
Muegyetem rkp. 3, H-1111 Budapest, Hungary; Thermohydraulics Department, MTA Centre for Energy Research, P.O. Box 49, Budapest
1525, Hungary
Axel
Groniewsky
Department of Energy Engineering, Budapest University of Technology and Economics,
Muegyetem rkp. 3, H-1111 Budapest, Hungary
Gábor
Györke
Department of Energy Engineering, Budapest University of Technology and Economics,
Muegyetem rkp. 3, H-1111 Budapest, Hungary
spinodal
tensile strength
negative pressure
attainable superheat
nucleation
cavitation
IAPWS
water
Experimentally determined tensile strength of water can be measured mainly by two methods: by the application of
high-intensity ultrasound or by the cooling of liquid-filled inclusions. The tensile strength around room temperature
given by the two methods differs remarkably; for the ultrasonic method it is around –30 MPa, while for the inclusion method it is around or below –100MPa. The controversy can be explained by assuming the effect of an already vanished low-temperature critical point, i.e., the existence of a second Widom region observable only under negative pressures. This Widom region is responsible for the increase of the isothermal compressibility, which—being the response function for pressure perturbations—can cause unexpected homogeneous nucleation in a region, still far enough from the near-spinodal metastable liquid states. Therefore—depending on the experimental paths—one can obtain nucleation in very deep negative pressures (near-spinodal region) or in a much higher pressure values, related to this new Widom region. A quintic equation of state (where quantic means that the highest term in volume is V5), similar to the van der Waals equation is proposed, which can qualitatively describe the expected anomalies.
HEAT TRANSFER IN SUPERCRITICAL FLUIDS: THE CASE OF HIGH-POWER HEAT RELEASE
187-200
10.1615/InterfacPhenomHeatTransfer.2018025453
Pavel V.
Skripov
Institute of Thermal Physics, Ural Branch, Russian Academy of Sciences, Amundsena St.
107a, Ekaterinburg 620016, Russia
Sergey B.
Rutin
Institute of Thermal Physics, Ural Branch of Russian Academy of Sciences, Ekaterinburg,
Russian Federation
compressed liquid
supercritical fluid
wire probe
pulse heating
heat transfer
thermal effusivity
Non-stationary heat transfer in supercritical fluids over short periods of time and at small spatial scales has been
studied experimentally. The aim of this study was to clarify the characteristic features of the heat conduction mechanism
under significant heat loads. For this purpose, the controlled pulse heating of a fast-response wire probe method was used. The characteristic heating time was a few milliseconds, and the heat flux density through the probe surface was increased up to 20 MW/m2. For all substances studied, the threshold decrease in the heat transfer intensity was revealed in the course of crossing the vicinity of the critical temperature along the isobar. This effect was more pronounced when the pressure value (p) was closer to the critical pressure (pc). The effect was observed over a wide range of reduced pressures up to p/pc = 3. The final solution to the problem of reconciling our result with peaks in the thermophysical properties, which are known from stationary experiments in the near-critical region, has not been found thus far.
RECOIL FORCE AND SPRAY ANGLE OF A PLANE JET OF SUPERHEATED WATER
201-206
10.1615/InterfacPhenomHeatTransfer.2018025478
Alexander V.
Reshetnikov
Institute of Thermal Physics, Ural Branch, Russian Academy of Sciences, Russian Federation
Nikolay A.
Mazheiko
Institute of Thermal Physics, Ural Branch, Russian Academy of Sciences, Russian Federation
Konstantin A.
Busov
Institute of Thermal Physics, Ural Branch, Russian Academy of Sciences, Russian Federation
slit nozzle
spray angle
metastable liquid
superheats
explosive boiling up
Experimental results of the spraying of boiling-up water upon a discharge through a short slit nozzle are presented. The
evolution of the shape and dispersion of the jet is traced as a function of the degree of the superheat. The dependence of
the spray angle on the initial thermodynamic parameters of the liquid in the working chamber is presented. The results
of reactive recoil measurements of the boiling-up water jet in a wide temperature range for a slit nozzle are given.
LIMITING STRETCHES OF LIQUIDS AT A PULSED FLOW ON A SHARP EDGE
207-214
10.1615/InterfacPhenomHeatTransfer.2018025417
Vladimir E.
Vinogradov
Institute of Thermophysics, Ural Branch of the Russian Academy of Sciences, Amundsen Street
107a, Ekaterinburg, 620016, Russia
Pavel A.
Pavlov
Institute of Thermophysics, Ural Branch of the Russian Academy of Sciences, Amundsen Street
107a, Ekaterinburg, 620016, Russia
fluctuation nucleation
negative pressure
shock regime
cavitation
A method of investigating the fluctuation formation of cavitation bubbles at a pulsed flow of the sharp edge of a solid inclusion has been developed and tested. On a sharp edge the flow rate increases locally and according to the Bernoulli equation the pressure drops. Under certain conditions the pressure on the edge of a solid inclusion, which flows by a pulsed liquid stream, becomes negative and may reach hundreds of atmospheres. It is shown that as a result of high localization of a liquid stretch the shock regime of cavitation on fluctuation centers is realized in experiments for a short time period in a small volume.
HEAT TRANSFER AND CRISIS PHENOMENA AT BOILING OF REFRIGERANT FILMS FALLING DOWN THE SURFACES OBTAINED BY DEFORMATIONAL CUTTING
215-222
10.1615/InterfacPhenomHeatTransfer.2018025507
Oleg
Volodin
IT SB RAS
Nikolay
Pecherkin
Kutateladze Institute of Thermophysics Siberian branch of the Russian academy of sciences
Aleksandr N.
Pavlenko
Kutateladze Institute of Thermophysics, Siberian Branch of the Russian Academy of Sciences,
Novosibirsk, Russia
Nikolay
Zubkov
Bauman Moscow State Technical University, Moscow, Russia
microstructured surface
falling films
heat transfer enhancement
nucleate boiling
boiling crisis
refrigerants
Determining the effective structures of heat-releasing surfaces that contribute to heat transfer enhancement and an
increase in the critical heat flux values under various heat transfer conditions is of considerable scientific and practical interest. This paper presents the experimental results on heat transfer in the laminar-wave flow of a film with a mixture of R114/R21 refrigerants on three vertical cylinders with differently microstructured outer surfaces. It is shown that the heat transfer coefficients in the regime of boiling on surfaces with a microstructure of a smaller height and rib pitch exceed the values obtained for surfaces with larger characteristics. Surfaces with partially closed micropores (by knurling) in the regime of boiling have an advantage in heat transfer over microstructured surfaces without closed pores. All microstructured surfaces studied in this work demonstrated an increase in the values of the critical heat flux
in comparison with a smooth surface.
SEED CONCENTRATION EFFECT ON HETEROGENEOUS NUCLEATION BY MOLECULAR DYNAMICS
223-229
10.1615/InterfacPhenomHeatTransfer.2018025167
Donguk
Suh
Department of Mechanical Engineering, Keio University, Yokohama, 223-8522, Japan
Kenji
Yasuoka
Department of Mechanical Engineering, Keio University, Yokohama, 223-8522, Japan
heterogeneous nucleation
seed concentration effect
molecular dynamics
Heterogeneous nucleation on a system with multiple seeds were conducted by molecular dynamics to understand how seed concentrations can affect the phase transition process. A constant particle number, volume, and temperature ensemble was applied to multiple systems of Lennard-Jones particles with a carrier gas that acts as a thermal reservoir. A different number of seeds were inserted into systems that have been previously found to have no spontaneous nucleation due to low supersaturation ratios. The addition of the seeds activated nucleation, but the increase in the nucleation rate was not perpetual because the system size was finite. A clear understanding of how the number of seeds decreasing the free energy barrier is presented along with the kinetic attachment and detachment rate variations. The decrease in the free energy barrier has a limit similarly to the aforementioned nucleation rate increase. The seed concentration results coincide with the predictions from the classical nucleation theory.
DYNAMICS AND EVAPORATION OF A THIN LOCALLY HEATED LIQUID FILM SHEARED BY A VAPOR FLOW IN A MICROCHANNEL
231-249
10.1615/InterfacPhenomHeatTransfer.2018025178
Yulia O.
Kabova
Institute of Thermophysics, Russian Academy of Sciences, Novosibirsk 630090, Russia; Centre of Smart Interfaces, Technische Universitaet Darmstadt, 64287 Darmstadt, Germany
Vladimir
Kuznetsov
Lavrentyev Institute of Hydrodynamics
Haruhiko
Ohta
Department of Aeronautics and Astronautics, Kyushu University, Chihaya Higashi-ku, Fukuoka, Fukuoka, Japan
Oleg A.
Kabov
Kutateladze Institute of Thermophysics of the Siberian Branch of the Russian Academy of Sciences, 1, Acad. Lavrentyev Ave., Novosibirsk, 630090, Russia; Novosibirsk State University, 2, Pirogova str., Novosibirsk, 630090, Russia; Novosibirsk State Technical University, 20 Prospect K. Marksa, Novosibirsk, 630073, Russia
evaporation
liquid film
local heat source
thermocapillarity
deformable gas–liquid interface
numerical investigation
To study the mechanism of evaporation and dynamics of the joint motion of a thin liquid film and the co-current
vapor flow in a microchannel at local heating, a new three-dimensional non-stationary two-sided mathematical model
has been proposed. The model takes into account the deformable gas–liquid interface, transfer of heat by liquid and vapor flow, heat loses due to evaporation, thermal conductivity in layers, as well as the temperature dependence of surface tension and liquid viscosity. Assuming the lubrication theory to be valid, the problem has been reduced to four governing equations for the film thickness, temperature fields in the vapor and liquid, and vapor pressure. The significant effect of heater length in the longitudinal direction on the film deformations and evaporation is shown numerically. The calculations show that there is an essentially nonlinear dependence of the minimum film thickness and maximum temperature on the length of the heater at the vapor–liquid interface. It has been found that the average evaporation intensity in all areas of the calculations may practically depend linearly on the length of the heating element.