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  • 1
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 83 (1998), S. 5069-5074 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A Monte Carlo method to simulate the plasma characteristics of an electron cyclotron resonance (ECR) microwave discharge system is presented. We use the method to predict the ion behavior in the downstream region of an ECR argon plasma. The pressure and space dependences of the plasma potential, the effects of gas pressure on the ion velocity and angle distribution and the evolution of distributions are examined and discussed in detail. Our results of the simulation show that the ion parallel velocity distribution appears to be bimodal and is strongly dependent on the gas pressure, whereas the ion perpendicular velocity distribution is mainly determined by the applied magnetic field, and the ion beam tends to be parallel to the magnetic field. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 1351-1357 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The transport of argon ions through the sheath as well as through the neutral region in electron cyclotron resonance discharges in argon gas is studied by means of Monte Carlo simulation, with the emphasis on the sheath potential and the characteristics of argon ions in the sheath. The evolution of the energy, velocity, and angle distributions of the ions in the sheath and the dependence of the distributions on gas pressure and substrate bias are investigated primarily concerned with collisional sheath. It is found that the effect of the pressure on the ion behavior in the sheath is not the same as in the neutral region, however, the substrate bias greatly influences the ion behavior mainly due to ion-neutral elastic collisions within the sheath. Our results also show that the ion motion in crossing the sheath tends to be parallel to the applied magnetic field, and an ion flux with good directionality can be expected by imposing on a negative voltage substrate. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Physics Letters A 169 (1992), S. 131-133 
    ISSN: 0375-9601
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1432-1181
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Description / Table of Contents: Zusammenfassung Die vorliegende Arbeit untersucht den Wärmeübergang bei Erstarrung an einem kalten Zylinder, der in ein überhitztes, flüssigkeitsgesättigtes und poröses Medium getaucht wurde. Das Hauptanliegen dieser Arbeit ist es, den Einfluß der freien Konvektion, in einer flüssigen Phase, auf den Erstarrungsvorgang zu klären. Es wurde ein mathematisches Verfahren entwickelt, das auf mehreren vernünftigen Annahmen für die Fluid-Strömung in einer flüssigen Phase basiert. Die bestehenden Gleichungen sind numerisch gelöst worden. Für die Verteilung der gefrorenen Schichtdicke und für die Wärmeübergangskoeffizienten der kalten Wand und Grenzfläche sind numerische Ergebnisse ermittelt worden. Die Einflüsse der unterschiedlichen Parameter wie die Raleighzahl, die Flüssigkeitsüberhitzung, die Stefanzahl und den dimensionslosen Radius des Zylinders werden dargestellt.
    Notes: Abstract The present paper analyses the freezing heat transfer on a cold cylinder immersed in a superheated liquid-saturated porous medium. The main emphasis of this paper is to clarify the effect of natural convection in the liquid phase on the freezing process. A mathematical model was developed, based on several reasonable assumptions for fluid flow in a liquid phase. The governing equations were numerically solved. Numerical results were reported for the thickness distribution of the frozen layer and the heat transfer coefficients at the cold wall and interface. The influences of various parameters such as Rayleigh number, liquid superheat, Stefan number and the dimensionless radius of a cylinder were demonstrated.
    Type of Medium: Electronic Resource
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