Results 151 to 160 of about 5,282 (200)

Local turbulent Prandtl Number Model

openaire   +1 more source

Some of the next articles are maybe not open access.

Related searches:

Magnetic fields generated by hydromagnetic dynamos at the low Prandtl number in dependence on the Ekman and magnetic Prandtl numbers

Physics of the Earth and Planetary Interiors, 2013
Abstract This article investigates the dependence of hydromagnetic dynamos on the magnetic Prandtl number at low Prandtl number. In all the investigated cases, the generated magnetic fields are dipolar and neither transition to hemispherical dynamos nor weaker magnetic fields (which are less dipole dominated) were observed, although the inertia ...
Jan Šimkanin, Pavel Hejda
exaly   +2 more sources

Prandtl number and thermoacoustic refrigerators

The Journal of the Acoustical Society of America, 2002
From kinetic gas theory, it is known that the Prandtl number for hard-sphere monatomic gases is 2/3. Lower values can be realized using gas mixtures of heavy and light monatomic gases. Prandtl numbers varying between 0.2 and 0.67 are obtained by using gas mixtures of helium–argon, helium–krypton, and helium–xenon.
Tijani, M.E.H., Zeegers, J.C.H., Waele, de, A.T.A.M.   +2 more
openaire   +2 more sources

On the Influence of the Molecular Prandtl Number on the Turbulent Prandtl Number

1979
Much more work has been done on the problem of turbulent transfer of momentum in a shear flow than on the problem of turbulent heat transfer. One of the reasons is obviously the fact, that from an experimental point of view informations about velocity-velocity correlations are easier to obtain compared with temperature-velocity correlations.
M. Jischa, H. B. Rieke
openaire   +1 more source

Zero-Prandtl-number convection

Journal of Fluid Mechanics, 1992
The zero-Prandtl-number limit of the Oberbeck—Boussinesq equations is compared to small-Prandtl-number Rayleigh—Bénard convection through numerical simulations. Both no-slip and free-slip boundary conditions, imposed at the top and bottom of a small-aspect-ratio, horizontally periodic box are considered.
Boeck, Thomas, Thess, André
openaire   +3 more sources

The turbulent Prandtl number in the near-wall region for low-Prandtl-number gas mixtures

International Journal of Heat and Mass Transfer, 1996
Results of experiments for binary gas mixtures, with molecular Prandtl numbers in the range 0.18–0.7 in flow in a smooth circular tube with constant transport properties were employed to examine models hypothesized for the distribution of the turbulent Prandtl number, Prt,{{y+, Pr, Re}}.
D.M. McEligot, M.F. Taylor
openaire   +1 more source

Prandtl number for liquids

Journal of Engineering Physics, 1975
It is established on the basis of experimental data for water and toluene that: 1) the Prandtl number can be expressed in a form analogous to an equation of state; 2) there are linear relations between the Prandtl number and the transport properties.
openaire   +1 more source

Modified turbulent Prandtl number model for helium–xenon gas mixture with low Prandtl number

Nuclear Engineering and Design, 2020
Abstract Gas-cooled space nuclear-reactor systems generally adopt the helium–xenon mixture (He–Xe) as a working fluid and coolant, the Prandtl number (Pr) of which is low for recommended mixing ratios. Many studies have shown that the turbulent Pr (Prt) is not constant and that it is greater than 0.85 for low-Pr fluids.
Biao Zhou, Yu Ji, Jun Sun, Yuliang Sun
openaire   +1 more source

Wall plume at extreme prandtl numbers

International Journal of Heat and Mass Transfer, 1987
An analysis of the wall plume for asymptotically large and small Pr has been carried out. It is shown that the nature of the transport differs significantly from the vertical surface and the line source plume. The asymptotically large Pr condition is studied. The other extreme of vanishingly small Pr is considered also.
openaire   +2 more sources

Free convection at low Prandtl numbers

Journal of Fluid Mechanics, 1969
In this paper it is shown that the free convection boundary layer approaches a singular character if the Prandtl number tends to zero. The method of matched asymptotic expansions is used to integrate the equations for this extreme case. An expression is derived for the Nusselt—Grashof relation and the results are compared with those of previous ...
openaire   +2 more sources