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111.
For a stationary nonlinear Boltzmann equation in a slab with a particular truncation in the collision operator, the Milne problem for the boundary layer together with a weak type of hydrodynamic behavior in the interior of the slab are studied by nonperturbative methods in the small-mean-free-path limit. 相似文献
112.
Boundary conditions for multidimensional scalar conservation laws are obtained in the context of hydrodynamic limits from a kinetic point of view. The initial boundary value kinetic problem is well posed since inward and outward characteristics of the domain can be distinguished. The convergence of the first momentum of the distribution function to an entropy solution of the conservation law is established. Boundary conditions are obtained. The equivalence with the Bardos, Leroux, and Nedelec conditions is studied. 相似文献
113.
L. Arkeryd R. Esposito R. Marra A. Nouri 《Archive for Rational Mechanics and Analysis》2010,198(1):125-187
We consider the Boltzmann equation for a gas in a horizontal slab, subject to a gravitational force. The boundary conditions
are of diffusive type, specifying the wall temperatures, so that the top temperature is lower than the bottom one (Benard
setup). We consider a 2-dimensional convective stationary solution, which for small Knudsen numbers is close to the convective
stationary solution of the Oberbeck–Boussinesq equations, near and above the bifurcation point, and prove its stability under
2-d small perturbations, for Rayleigh numbers above and close to the bifurcation point and for small Knudsen numbers. 相似文献
114.
Nouri M. Ashenai-Ghasemi F. Rahimi-Sherbaf G. Kashyzadeh K. Reza 《Mechanics of Composite Materials》2020,56(3):339-352
Mechanics of Composite Materials - The static performance of a composite type 4 CNG cylinder was investigated using a finite-element simulation and experimental validation. This cylinder involved a... 相似文献
115.
N. M. Nouri S. Mohammadi M. K. Neyestanaki E. Beygi 《Journal of Applied Mechanics and Technical Physics》2018,59(3):445-450
The effects of the camber ratio on the hydrodynamic and structural behaviors of a NACA-based ducted marine propeller in the wake flow behind an underwater axisymmetric body are numerically studied by computational fluid dynamics methods, in particular, the finite element method. The results are presented in terms of the efficiency, deflection, pressure coefficient, and natural frequencies. It is shown that the wake flow strongly affects the performance of the selected propulsion system. It is shown that the distributions of the camber ratio over the blades of the propeller nonlinearly changes its resistance against cavitation occurrence and deflection, and also changes its hydrodynamic performance and vibrational behavior. 相似文献
116.
A. Nouri 《Mathematical Methods in the Applied Sciences》2000,23(6):561-574
The distance to a set of Maxwellians is determined for a family of functions with bounded mass, energy and a small entropy production term. Functions with small masses are close to the null Maxwellian. Functions with masses bounded from below by a constant are approached by functions proportional to the gain term of the Boltzmann operator, taking advantage of its regularity. For these regularizations, the integrands of the entropy production term are small everywhere. Hence classical arguments can be used to obtain the closedness to the set of Maxwellians. Copyright © 2000 John Wiley & Sons, Ltd. 相似文献
117.
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119.
An Unexpected Role of Carbon Disulfide: A New and Efficient Method for the Synthesis of 2‐Substituted Benzimidazoles 下载免费PDF全文
A new and efficient methodology for the synthesis of 2‐substituted benzimidazoles is described. In this procedure, CS2 unexpectedly facilitated the cyclization reaction between benzene‐1,2‐diamine and benzenecarbaldehydes in CH2Cl2 at room temperature. The reactions occur under mild conditions require simpler equipment and easier workup procedures. 相似文献
120.
The work described in this paper establishes the accuracy with which the power number can be measured within a mixing vessel and presents measurements for five impellers (Rushton, bucket, 45°-pitched blade, 60°-pitched blade and hyperboloid) as a function of rotational speed. The technique uses strain gauges and the telemetric transmission of the strain and is, therefore, more accurate than methods which involve mechanical determination of torque and that allows power measurements to be carried out in relatively small and more cost-effective models of mixing vessels. In the cases where previous data exists the results of this study compare well. This work provides new data for the bucket, 45°-pitched blade and hyperboloid (low Reynolds numbers) impellers and represented a systematic study for all five impellers with one measurement system.The authors would like to acknowledge the financial support of the EPSRC during the course of this work. 相似文献