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Showing 1 to 12 of 12 for “"Accommodation coefficient"”.
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Estimation Of Tangential Momentum Accommodation Coefficient Using Molecular Dynamics Simulation
The Tangential Momentum Accommodation Coefficient (TMAC) is used to improve the accuracy of fluid flow calculations in the slip flow regime. Under such conditions (indicated by Knudsen number greater than 0.001), the continuum assumption that a fluid velocity at a solid surface is equal to the …
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Dynamics of nanoparticle combustion
… observations can be reconciled if the energy accommodation coefficient for these conditions is of the order of 0.005, which is the value suggested by Altman, instead of approximately unity, which is the common assumption. A simple model was developed for nano-aluminum particle combustion …
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Heat Transfer and Combustion Characteristics of Nano-Sized Aluminum and Aluminum Oxide Utilizing Advanced Laser and Optical Diagnostics
… part of this study focuses on determining the accommodation coefficient of nano-alumina particles. The accommodation coefficient represents the efficiency of a gas in removing heat from a surface, expressed as the ratio of the actual heat loss to the ideal loss. A comprehensive mathematical …
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Heterogeneous combustion of condensed particles in transition regime
… by an incorrectly assumed value of the thermal accommodation coefficient of gas molecules on the particle surface. The technique of finding the accommodation coefficient for small metal particles heated to high temperatures is developed and tested for the Zr - Ar system. The optical emission …
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Time resolved measurements of droplet growth in a Wilson cloud chamber
… work. Two of the theories used the sticking coefficient alone as a parameter, while the third used both sticking and thermal accommodation coefficients. No interpretation of the numerical value of the sticking coefficient could be made. In the theory invoking sticking and thermal …
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Initial surface reactions and nucleation kinetics of boron on atomically clean molybdenum substrates
… the theoretical model inferrence of the thermal accommodation coefficient, of the adsorbate source species (BI<sub>3</sub>), on the substrate is made.</p> <p>The free energy of desorption of boron from molybdenum field emitter surfaces has been measured by isothermal desorption experiments and …
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Measurement of Continuum Breakdown Using a Disc Spin-Down Experiment in Low Pressure Air
… a quantity called as the tangential momentum accommodation coefficient (TMAC) becomes important because it is a measure of the momentum transport from a gas molecule to a surface. Very few experimental measurements of continuum breakdown in boundary layer flows exist. All experimental …
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Measurement and Control of Slip-Flow Boundary Conditions at Solid-Gas Interfaces
… hydrophobilic glass, the tangential momentum accommodation coefficient (TMAC) for nitrogen on hydroxyl-terminated silica changed from 0.25 to 0.88 when the humidity changed from 0 to 98 %. On hydrophobized glass, TMAC changed from 0.20 to 0.56 in the same range. The effect of the gas on TMAC …
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Kinetics of Heat and Mass Transfer Near the Liquid-Vapor Interface
… Further, these experiments show that the accommodation coefficient of water is at least 0.5 and likely quite close to 1, indicating nearly ideal behavior of the interface. This thesis advances our fundamental understanding of the kinetics of heat and mass transfer near the liquid-vapor …
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Rates of evaporation of small drops at low pressures
… in velocity space) and the condensation coefficient; the probability or a molecule condensing on impact with the surface. In the presence of a concentration gradient, according to Chapman and Enskog's theory of non-uniform gases, the velocity distribution function will differ from the …
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Buoyancy-thermocapillary convection of volatile fluids in confined and sealed geometries
… analytical prediction for the heat transfer coefficient and the optimal size of the pores of the wick (or the width of the microchannels).