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The implementation of a hybrid simulation algorithm based on the compressible Navier–Stokes equations and the Direct Simulation Monte Carlo (DSMC) method is discussed, with emphasis on problems of transient nature. The coupling of the two methods at their common interface is achieved by the generation of particles according to the local Maxwellian distribution and the imposition of macroscopic quantities...
In the present study, we investigate the characteristics of thermal cavities in the rarefied flow regime using the Direct Simulation Monte Carlo (DSMC). We use a recently developed iterative technique to impose a desired wall heat flux boundary condition in the DSMC algorithm. Fluid mechanics and heat transfer behavior are studied over the walls and in the domain of the thermal cavity over a wide...
The Monte Carlo method is suitable to use for the problems of turbomolecular pumps (TMPs). This method has three calculation models, namely, the 2D, ideal 3D, and real 3D models. Theoretically, real 3D models demonstrate the real geometry of TMP and should be more accurate than 2D and ideal 3D models. In this study, a simple modified algorithm of a real 3D model based on that of Amoli et al. is used...
A dynamic vacuum standard was developed at the Physikalisch-Technische Bundesanstalt (PTB) to test the response of pressure gauges to changes of pressure from 100 kPa to 100 Pa within one second. It has been validated through a series of comparisons of the pressure and temperature evolution curves between simulations and measurements. On the theoretical side, hybrid continuum-particle and conjugate...
Time-dependent flows of single gases and binary gas mixtures with various molar fractions from a chamber through a short tube into vacuum are examined by simulations and experiments. The main goal is the comparison of the flow behaviour between pure gases and binary mixtures including the investigation of the gas separation effect. The simulations are based on an explicit hybrid scheme, coupling at...
Molecular distillation process is a type of vapors transport process at high vacuum in the distillation space between evaporator and condenser. To get a better understanding of vapor flow characteristics in molecular distillation, vapor phase behavior is simulated using the direct simulation Monte Carlo (DSMC) method. The variable hard sphere (VHS) model is adopted to calculate molecular collisions...
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