The Centrifugal nuclear Thermal Rocket (CNTR) is a nuclear Thermal Propulsion (NTP) concept designed to heat propellant directly by the reactor fuel. The primary difference between the CNTR concept and traditional NTP...
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This chapter describes the removal of microorganisms and particulates from indoor air. Granular bed filters may be used for particulate removal from air. These systems have been developed mainly for use in industrial ...
This chapter describes the removal of microorganisms and particulates from indoor air. Granular bed filters may be used for particulate removal from air. These systems have been developed mainly for use in industrial processes and are not suitable for use in indoor settings. However, if desiccant materials are used as the filtering media, these types of units may be used for cleaning indoor air. Desiccant-based air conditioning systems are used for cleaning indoor air. In desiccant based systems, moist air is passed through a bed containing desiccants, where moisture is removed from air by adsorption. The dry air from the bed is further conditioned to adjust its temperature and humidity. Silica gel, molecular sieves, and activated alumina are primarily used as desiccants because of their excellent water adsorption capacity. particulate removal systems work on the principle that as a gas stream containing particle flows through a filtration device the particles are acted on by various external forces that cause their separation from the gas stream. The mechanisms that cause the separation of the particles from the gas stream include sedimentation electrostatic precipitation, inertial deposition, and Brownian diffusion.
The half-space problem of rarefied gas flow (the Kramers problem) is considered for the linearized Boltzmann equation and arbitrary gas-surface interaction. Accurate numerical results for the velocity slip coefficient...
The half-space problem of rarefied gas flow (the Kramers problem) is considered for the linearized Boltzmann equation and arbitrary gas-surface interaction. Accurate numerical results for the velocity slip coefficient and velocity defect are obtained for the rigid sphere interaction and Maxwellian boundary condition.
The existence of a minimum in the cylindrical Poiseuille flow of a rarefied gas has been known since the experiments of Knudsen [Ann. Phys. 4, 75 (1909)]. Previously, the phenomenon has been studied with models of the...
The existence of a minimum in the cylindrical Poiseuille flow of a rarefied gas has been known since the experiments of Knudsen [Ann. Phys. 4, 75 (1909)]. Previously, the phenomenon has been studied with models of the Boltzmann equation, but results for the Boltzmann equation itself have not been reported. In the present paper, proceeding from recent studies, first the SN numerical algorithm for solving the linearized Boltzmann equation for the cylindircal geometry is outlined. Then, explicit numerical results for a rigid sphere gas and the boundary condition of diffuse specular reflection are obtained. The results show a minimum of the flow rate, and generally, provide a good description of the experimental data.
Local and global condensation rates of particles of arbitrary shapes are of interest in the studies of aerosol. The present paper is a follow-up on some recent work (Loyalka and Griffin, 1993, Nucl. Sci. Engng 114, 13...
Local and global condensation rates of particles of arbitrary shapes are of interest in the studies of aerosol. The present paper is a follow-up on some recent work (Loyalka and Griffin, 1993, Nucl. Sci. Engng 114, 135;1994, J. Aerosol Sci. 25, 509;Griffin and Loyalka, 1994, J. Aerosol Sci. 25, 1271) where it was shown that the relevant diffusion equation, with continuum and near-continuum boundary conditions, can be converted to an integral equation and then solved by a quadrature technique. Here the focus is on the application of a boundary element formulation to the integral equation. This numeric formulation is verified against analytical solutions for a spherical and a spheroidal particle. The formulation is then applied to a study of condensation on two wetted spheres with a liquid meniscus between them. Both the local and global condensation rates are calculated and the utility of an equivalent sphere approach is explored.
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