Центральная Научная Библиотека УрО РАН

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   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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   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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   R 96

    Rutin, S. B.
    Apparatus for studying heat transfer in nanofluids under high-power heating [Electronic resource] / S. B. Rutin, P. V. Skripov // Journal of Engineering Thermophysics. - 2012. - Vol.21, №2. - P144-153. - Bibliogr. : p. 153 (19 ref.)

ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
HEAT TRAHSFER -- HIGH-POWER HEATING -- ELECTRONIC CONTROL
Аннотация: A technique of electronic control of the probe heating power is developed using the method of controlled pulse heating of a wire probe, that is a resistance thermometer, was developed. An apparatus implementing this technique was fabricated. The characteristic parameters of the apparatus are as follows: the heating pulse length, 1 to 10 ms; the heat flux density through the surface of a 20 µm probe, 1 to 10 MW/m2; repeatability of selected power value in a series of pulses is on a level of 0.05%. As an example, the constant heating power mode is applied for comparing the thermal resistance of nanofluids in the region of stable states of liquid and superheated (with respect to the liquid-vapor equilibrium temperature of the base liquid) ones. The parameter was the content of Al2O3 nanoparticles in the base liquid (isopropanol).

\\\\expert2\\NBO\\Journal of Engineering Thermophysics\\2012, V.31, N 2. P. 144-153.pdf
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