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F. Rosenberger
University of Utah
38Publications
19H-index
1,181Citations
Publications 38
Newest
#1Nicholas I. Buchan (UofU: University of Utah)H-Index: 1
#2F. Rosenberger (UofU: University of Utah)H-Index: 19
Abstract The GeSe: GeI 4 vapor crystal growth system was characterized mass spectroscopically. A steady-state Knudsen effusion technique was developed to simulate the equilibrium conditions at one end of a vapor transport ampoule. It was found that the previously neglected equilibrium GeSe 2 (s) = GeSe(v)+ 1 2 Se 2 (v) reduces the Se 2 (v) concentration to an extent that sublimation/ condensation of GeSe becomes the dominant transport mechanism. At total pressure near 1 atm the concentration of ...
#1Chiu Kuan-Cheng (UofU: University of Utah)H-Index: 2
#2Jalil Ouazzani (UofU: University of Utah)H-Index: 1
Last.F. Rosenberger (UofU: University of Utah)H-Index: 19
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Abstract Fully developed velocity profiles of longitudinal convection rolls in mixed convection between horizontal plates were measured in nitrogen by laser Doppler anemometry for a range 2472 Ra Re w -profiles ( Pr = 0.71) are in good agreement with theoretical predictions ( Pr → ∞) and other experimental results ( Pr = 11.1 and 930) for Rayleigh-Benard convection. A detailed study of the longitudinal velocity modulation Δu [ w max ( Ra ), Re ] is presented. Also, asymmetric roll patterns were ...
#1Chiu Kuan-Cheng (UofU: University of Utah)H-Index: 2
#2F. Rosenberger (UofU: University of Utah)H-Index: 19
Entrance effects in mixed convection between horizontal, differentially heated plates were studied in nitrogen by laser Doppler anemometry in a range 1368 < Ra < 8300 and 15 < Re < 170. Two entrance lengths were deduced from velocity profiles: one for the onset of buoyancy-driven convective instability, and one for the full development of the mixed flow. Explicit expressions for both entrance lengths are given. In addition, unsteady longitudinal convection rolls were observed. These are discusse...
Abstract Transport and interface kinetics concepts that have proven successful in the design and control of inorganic crystal growth experiments are outlined. Their potential usefulness and limitations in protein crystal growth are discussed. The presentation follows a selection of observations and statements that are often made by workers in the protein crystal growth field. The paper is meant to be tutorial in nature. Emphasis is placed on concepts which bear practical significance. Though the...
#1M.C. Delong (UofU: University of Utah)H-Index: 3
#2F. Rosenberger (UofU: University of Utah)H-Index: 19
Abstract Alkali cyanides are not generally available in adequate purity to permit single crystal growth. Commercially available NaCN and KCN may be purified by a combination of vacuum drying, gettering of oxygen-containing anions, melt filtration and/or zone refining. Alternatively, higher purity cyanides may be synthesized by a variety of techniques. The efficacies of various synthesis and purification schemers are compared using infrared absorption for the detection of anions and atomic absorp...
#1Jenn‐Shing Chen (UofU: University of Utah)H-Index: 2
#2Nai‐Ben Ming (UofU: University of Utah)H-Index: 2
Last.F. Rosenberger (UofU: University of Utah)H-Index: 19
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It is traditionally assumed that the pair energies of atoms on the surface are site independent and equal to the pair energy in the bulk of the crystal (constant bond energy approach). We have assumed that the internal energy of an atom, ψ, depends nonlinearly on the number of nearest neighbors n in the form ψ(n)=−(an+bn2), where a and b are material constants that can be evaluated from experimentally determined heats of sublimation and energies of bulk vacancy formation. This simple approximati...
#1Patrick Bontoux (CNRS: Centre national de la recherche scientifique)H-Index: 20
#2B. Roux (CNRS: Centre national de la recherche scientifique)H-Index: 22
Last.F. Rosenberger (UofU: University of Utah)H-Index: 19
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Abstract Cylindrical, differentially heated and horizontal enclosures are commonly used in technological processes. A knowledge of the flow patterns in such a system is important for process optimization. In the past, flow predictions have often been made by using an asymptotic analytical approximation in the core, or by assuming a two-dimensional solution for the plane of symmetry. Laser Doppler anemometry studies, recently conducted by Schiroky and Rosenberger, have shown that in reality the f...
#1Patrick BontouxH-Index: 20
#2C. SmutekH-Index: 4
Last.G. de Vahl Davis (UNSW: University of New South Wales)H-Index: 20
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Abstract Finite difference solutions and experiments are presented for free convection in differentially heated cylinders when the inclination varies with respect to the gravity vector. The results are compared with asymptotic solutions in horizontal cylinders for the core- and boundary layer-driven regimes. Over a range of 60° from the horizontal, a good agreement is obtained between the numerical and experimental results for large aspect ratio (A=10) and Rayleigh number (Ra≈20,000).
#1Nai‐Ben Ming (UofU: University of Utah)H-Index: 2
#2Jenn‐Shing Chen (UofU: University of Utah)H-Index: 2
Last.F. Rosenberger (UofU: University of Utah)H-Index: 19
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Abstract The morphology of CBr 4 crystals was microscopically studied at temperatures near the polymorphic transition ( T tr =47°C) during growth from the vapor. Our observations give evidence that surface roughening is occurring with increasing temperature as an apparent precursor of the solid state phase transition.
#1B.L. Markham (UofU: University of Utah)H-Index: 3
#2F. Rosenberger (UofU: University of Utah)H-Index: 19
Abstract The enhancement of vapor transport across horizontal and inclined rectangular (2D) enclosures by expansive convection is studied numerically for a range in Grashof number that extends up to boundary layer flow. Comparison is made with predictions of the simplifying model and resulting analytical treatment of Klosse and Ullersma for various aspect ratios of the enclosure. The influence of varying Schmidt and Prandtl numbers is investigated. Solutions for interfacial (growth) flux and tem...
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