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1.
Инвентарный номер: нет.
   
   S 81

   
    Statistical substantiation of the van der Waals theory of inhomogeneous fluids / V. G. Baidakov, S. P. Protsenko, G. G. Chernykh, G. Sh. Boltachev // Physical Review E: Statistical, Nonlinear, and Soft Matter Physics. - 2002. - Vol.65, №4. - С. 041601-041617
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
LENNARD-JONES FLUID -- VAN-DER-WAALS THEORY -- MOLECULAR DYNAMICS
Аннотация: Computer experiments on simulation of thermodynamic properties and structural characteristics of a Lennard-Jones fluid in one- and two-phase models have been performed for the purpose of checking the base concepts of the van der Waals theory. Calculations have been performed by the method of molecular dynamics at cutoff radii of the intermolecular potential rc,1=2.6σ and rc,2=6.78σ. The phase equilibrium parameters, surface tension, and density distribution have been determined in a two-phase model with a flat liquid-vapor interface. The strong dependence of these properties on the value of rc is shown. The p,ρ,T properties and correlation functions have been calculated in a homogeneous model for a stable and a metastable fluid. An equation of state for a Lennard-Jones fluid describing stable, metastable, and labile regions has been built. It is shown that at T>~1.1 the properties of a flat interface within the computer experimental error can be described by the van der Waals square-gradient theory with an influence parameter κ independent of the density. Taking into account the density dependence of κ through the second moment of the direct correlation function will deteriorate the agreement of the theory with data of computer simulation. The contribution of terms of a higher order than (∇ρ)2 to the Helmholtz free energy of an inhomogeneous system has been considered. It is shown that taking into account terms proportional to (∇ρ)4 leaves no way of obtaining agreement between the theory and simulation data, while taking into consideration of terms proportional to (∇ρ)6 makes it possible to describe with adequate accuracy all the properties of a flat interface in the temperature range from the triple to the critical point

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2.
Инвентарный номер: нет.
   
   P 31

    Pastukhov, V. G.
    Development and investigation of a cooler for electronics on the basis of two-phase loop thermosyphons / V. G. Pastukhov, Yu. F. Maydanik, V. I. Dmitrin // Heat Pipe Science and Technology, An International Journal , vol. - Vol.1, №1. - С. 47-57
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
LOOP THERMOSYPHON -- EVAPORATOR -- CAPILLARY STRUCTURE,
Аннотация: The objective of this work was to develop a device for cooling electronic elements with a heat power up to 30 W by its rejection and dissipation in the ambient by free air convection. The device specification assigned the temperature range of the ambient conditions from −40 to +105° C and the available space of 30(W) × 120(H) × 200(L) mm. As a result a hybrid scheme based on a loop thermosyphon was proposed, where the evaporator embodied the capillary structure. In such a scheme, the return working fluid flow was ensured by the combined action of the gravity and capillary forces. Several prototypes with different loop and evaporator designs were tested in laboratory conditions. Water and heptane were used as working fluids. The experiments showed that the role of the capillary structure locally placed in the evaporator can be efficiently implemented by both highly porous cellular materials and capillary grooves made on the evaporating surface. It is also shown that heptane can be effectively used as a working fluid which is appropriate for the temperature range requirements. At the same time the device has good mass-and-size characteristics and total thermal resistance under a nominal heat load of about 1.7° C/W

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3.
Инвентарный номер: нет.
   
   B 16

    Baidakov, V. G.
    Effect of the cut-off radius of the intermolecular potential on phase equilibrium and surface tension in Lennard–Jones systems / V. G. Baidakov, G. G. Chernykh, S. P. Protsenko // Chemical Physics Letters. - 2000. - Vol.321, №3-4. - С. 315-320
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
MOLECULAR-DYNAMICS SIMULATION -- LIQUID-VAPOR INTERFACE -- LENNARD-JONES FLUID
Аннотация: We present the molecular dynamic simulation results for the liquid–vapour interface of the pure Lennard–Jones fluid. The thermodynamical properties, the surface tension, the effective thickness of interfacial layer and the mean-square amplitude of capillary waves are determined. Calculations have been performed at cut-off radii of the intermolecular potential rc1=2.6σ and rc2=6.78σ. It is shown that the cut-off radius of the interaction potential in the two-phase systems should be chosen to be larger than that in the one-phase systems for an adequate representation of properties

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4.
Инвентарный номер: нет.
   
   T 44

   
    The van der Waals Theory of Capillarity and Computer Simulation / V. G. Baidakov, G. Sh. Boltachev, S. P. Protsenko, G. G. Chernykh // Colloid Journal (Translation of Kolloidnyi Zhurnal). - 2002. - Vol.64, №6. - С. 661-670
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
THERMODYNAMIC PROPERTIES -- LENNARD-JONES FLUID -- VAN-DER-WAALS
Аннотация: Computer experiments are performed on the determination of thermodynamic properties and structural characteristics of the Lennard-Jones fluid in one- and two-phase models to check the basic concepts of the van der Waals theory of capillarity. Calculations are performed using molecular dynamics method. It is shown that, at T* 1.1, the properties of flat interface can be described, within the limits of computer experiment error, in terms of the van der Waals gradient theory with the density-independent influence parameter . The account of density dependence of via the second moment of direct correlation function deteriorates the agreement between the theory and the data of computer simulation. The contribution of inhomogeneous system of higher (than ()2) terms to the Helmholtz free energy of inhomogeneous system is considered. It is shown that the account of terms proportional to ()4 does not lead to the agreement between the theory and the data of computer simulation, whereas the consideration of terms proportional to ()6 makes it possible to describe (with a good accuracy) all the properties of flat interface within the temperature range from triple point to the critical one

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5.
Инвентарный номер: нет.
   
   L 88

   
    Loop Heat Pipes for Cooling Systems of Servers / Yu. F. Maydanik, S. V. Vershinin, V. G. Pastukhov, S. Fried // IEEE Transactions on Components and Packaging Technologies. - 2010. - Vol.33, №2. - С. 416-423
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
HEAT-TRANSFER DEVICE -- LHPs -- OPTERON CPUs
Аннотация: Loop heat pipes (LHPs) are exceptionally efficient heat-transfer devices that employ a closed loop evaporation-condensation cycle that can be used to cool densely packed electronic systems that reject large quantities of heat, including computers and their central processing units (CPUs). Tests were carried out on miniature ammonia LHPs with a CPU thermal simulator using different ways of condenser cooling. The possibility of maintaining the cooled object temperatures between 40°C and 70°C with heat load changing from 100 to 320 W was demonstrated. Subsequent tests of these devices in a 1U computer with dual core advanced micro devices Opteron CPUs, dissipating between 95 and 120 W, have confirmed the advantages and heat transfer efficiency of LHP-based cooling systems used to cool CPU in 1U chassis

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6.
Инвентарный номер: нет.
   
   P 34

    Pavlov, P. A.
    Thermodynamic crisis of boiling / P. A. Pavlov // Journal of Engineering Thermophysics. - 2007. - Vol.16, №3. - С. 145-154
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
VAPOR -- LOOP HEAT PIPE
Аннотация: The procedure of calculation of the dynamics of rapid near-wall vaporization near a metallic heater is considered. A physical model of explosive boiling-up on bubbles of fluctuation origin is used. The model is limited to regimes when the motion of bubbles can be ignored and convective flows do not have enough time to develop. It is assumed that the dry spot under a bubble thermally insulates the heater wall. The heat removal is provided by the vicinity of the wetting line (WL). An analytical calculation has become possible on the basis of the well-known exact solution to the problem of the temperature field near the wetting line. Generalization of this solution has led to two new problems. These are the problem of allowance for the difference of the dynamic wetting angle from the right angle and that of allowance for thermocapillary flows. A numerical comparison of the results of calculation of the dry area with the use of different methods of allowing for the “tightness” effect in the dynamics of bubble generation and growth has been made. The evolution of bubbles from their generation to growth limited by the heat supply has been investigated. It has been found that the transition stage in the development of bubbles from Rayleigh to thermal ones is of considerable importance in the processes of explosive boiling-up. The dynamics of change in the dry area and wetting line length prior to the stage of bubble merging into a vapor film has been calculated. A condition of passage of the heat flux through a maximum is found. The applicability of the idea of thermodynamic crisis to calculations of miniature devices is justified. The problem of constructing a model to calculate the interphase surface shape near the wetting line under a developed thermocapillary flow and considerable reactive forces of the vapor flow is formulated. The model is in good agreement with the results of experiments on pulsed superheating of liquids at a rate higher than 1 K/μs

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7.
Инвентарный номер: нет.
   
   P 31

    Pastukhov, V. G.
    Low-noise cooling system for PC on the base of loop heat pipes / V. G. Pastukhov, Yu. F. Maydanik // Applied Thermal Engineering. - 2007. - Vol.27, №5-6. - С. 894-901
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
COMPUTER COOLING -- LOOP HEAT PIPE -- PASSIVE CPU COOLING SYSTEM
Аннотация: The problem of current importance connected with a wide use of personal computers (PC) and a rapid growth of their performance is a decrease in the noise level created at the operation of cooling system fans. One of the possible ways of solving this problem may be the creation of passive or semi-passive systems on the base of loop heat pipes (LHPs) in which the heat sink is an external radiator cooled by natural and/or forced air convection. The paper presents the results of development and tests of several variants of such systems, which are capable of sustaining an operating temperature of 72–78 °C on the heat source thermal interface which dissipates 100 W at an ambient temperature of 22 °C. It is also shown that the use of additional means of active cooling in combination with LHPs allows to increase the value of dissipated heat up to 180 W and to decrease the system thermal resistance down to 0.29 °C/W

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8.
Инвентарный номер: нет.
   
   K 79

    Koverda, V. P.
    The origin of 1/f fluctuations and scale transformations of time series at nonequilibrium phase transitions / V. P. Koverda, V. N. Skokov // Physica A. - 2005. - Vol.346, №3-4. - С. 203-216
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
FLUCTUATIONS -- POWER SPECTRA -- NONEQUILIBRIUM PHASE TRANSITIONS
Аннотация: Investigations of the dynamics of heat and mass transfer show that in crisis and transient conditions one can observe high-energy fluctuations with a power spectrum inversely proportional to the frequency (flicker or 1/f fluctuations). Such a spectrum presupposes energy transient from high to lower frequency modes and the possibility of large-scale catastrophic events in a system. Theory shows that such fluctuations arise in a system owing to the simultaneous progress of interacting phase transitions in the presence of a white noise of sufficient intensity. The distributions functions of fluctuations during scale transformations of a system of stochastic equations describing the 1/f noise generations have been investigated. It is shown that the Gaussian distributions of a random process with a 1/f spectrum under a roughness of a scale change to exponential distribution characteristic of the statistics of extreme events. The probability of such events should be taken into account in predicting the stability of different heat transfer regimes

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9.
Инвентарный номер: нет.
   
   S 82

   
    Steady-state and transient performance of a miniature loop heat pipe / Chen. Yuming, M. Groll, R. Mertz, Yu. F. Maydanik // International Journal of Thermal Science. - 2006. - Vol.45. - С. 1084-1090
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
LOOP HEAT PIPES -- HEAT TRAHSFER -- ELECTRONICS COOLING
Аннотация: A series of tests have been carried out with a miniature loop heat pipe (mLHP), which has been developed for consumer electronics cooling, for horizontal and four vertical orientations under different sink temperatures. The mLHP has a cylindrical evaporator of 5 mm outer diameter and 29 mm length. The steady-state operating characteristics are similar for different orientations except for the orientation where the evaporator is above the compensation chamber. At an evaporator temperature of 75 °C, an evaporator heat load up to 70 W can be reached with thermal resistance of about 0.2 °C/W. The transient behavior of the mLHP is studied in detail. In general, the mLHP can be started up with very low power input (5 W). Big temperature oscillations in the liquid line were found in many cases, however, the temperature oscillations in the evaporator are minimum. The orientations greatly influence the operating characteristics of the mLHP. At least for the horizontal orientation, the overall performance of the tested mLHP is satisfying

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10.
Инвентарный номер: нет.
   
   G 15

    Galashev, A. E.
    Dielectric characteristics of O2(H2O)i and (O2)2(H2O)i clusters. Computer-aided experiment [Текст] / A. E. Galashev, V. N. Chukanov, O. A. Galasheva // Colloid Journal (Translation of Kolloidnyi Zhurnal). - 2006. - Vol. 68, № 2. - С. 131-136
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
DIELECTRIC CONSTANT
Аннотация: Absorption of oxygen molecules by water clusters with sizes of 10 меньше либо равно i меньше либо равно 50 is studied by the molecular dynamics method using the modified TIP4P model. It is revealed that the total dipole moment of the clusters nonmonotonically increases with their sizes. Absorption of O2 molecules tends to raise the static permittivity of the ultradispersed medium formed by the clusters. The real and imaginary parts of the permittivity of water clusters with absorbed O2 molecules are aperiodic functions of frequency. The permittivity components turn out to be nonmonotonic functions of cluster sizes. The IR absorption and reflectance spectra are calculated for clusters of pure water and aggregates with absorbed O2 molecules. After the addition of oxygen molecules, the absorption coefficient of the clusters decreases, while the reflection coefficient increases. It is concluded that the capture of oxygen molecules by atmospheric moisture may reduce the greenhouse effect.

\\\\Expert2\\NBO\\Colloid Journal\\2006, V.68, N2,131.pdf
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