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1 edition of Investigation of viscous flow in glass during phase separation found in the catalog.

Investigation of viscous flow in glass during phase separation

Investigation of viscous flow in glass during phase separation

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Published by National Bureau of Standards in [Washington] .
Written in English

    Subjects:
  • Glass

  • Edition Notes

    Bibliography: p. 36-37

    StatementJoseph H. Simmons [et al.]
    SeriesUnited States. National Bureau of Standards. Technical note -- 792
    ContributionsSimmons, J. H. 1941-
    The Physical Object
    Paginationiii, 37 p. :
    Number of Pages37
    ID Numbers
    Open LibraryOL15472582M

    2 days ago  With longer reinforcement fibers as traditionally found in compression molding of sheet molding compound (SMC) or long fiber thermoplastics (LFT), increasing fiber interactions lead to fiber matrix phase separation during polymer flow and hence to fluctuations in fiber content inside complex components [1,2,3,4].Early experiments by Schmachtenberg et al. [] showed increasing fiber-matrix. the oil flow rate, however, the fractional thickness increase was smaller than that of flow rate. Literature for Two-Phase Flow In addition to a few investigations related to the oil return problem, there are a large number of publications focused on the adiabatic, two-phase flow, which are mostly concerned with air-water or water-steam mixtures.

    High-efficiency phase separation internals reduce the size and weight of the pressure vessel, reduce the footprint, and reduce the need for floor space, thereby lowering the overall cost. During operation, high-efficiency phase separation internals protect the process system from contamination. They also reduce the operating cost of maintenance. For the fluid state, the following holds: The phase shift is between 45° and 90°, thus 90° ≥ δ > 45°. In this case, the material at rest is fluid. The following holds for the phase shift: δ = 0° for ideally elastic deformation behavior and δ = 90° for ideally viscous flow behavior (Figure ).

    The highly unsteady nature of the flow produced in radial pumps working at off-design was carefully analyzed by Sinha et al. [], who adopted PIV and pressure fluctuations measurements to investigate the onset of dynamic stall at reduced flow rates in a vaned centrifugal the diffuser vanes close to the tongue of the volute, the flow alternated between outward and backflow. Flow regime map for the horizontal flow of an air/water mix- ture in a 5. 1 cm diameter pipe with flow regimes as defined in figure Hatched regions are observed regime boundaries, lines are .


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Investigation of viscous flow in glass during phase separation Download PDF EPUB FB2

Viscous flow in glass during phase Separation. Abstract. Viscous Flow in Glass During Phase Separation JOSEPH H. SIMMONS, SUSAN A. MILLS, and ALBERT NAPOLITANO National Bureau of Standards, Washington, DC The isothermal viscosities of two borosilicate glasses, one a commercial glass widely used for chemical glassware, increase by 4 to 5 orders of magnitude with heat-treatment time near the annealing point.

Viscous Flow in Glass During Phase Separation. June ; Journal of the American Ceramic Society 57(3) - ; DOI: /jtbx. Despite extensive investigation. (a) SEM image of an iron aluminosilicate glass (C 61SiOAl2OFeOCaOK2O) obtained after heat treatment at °C and quenching, having undergone secondary phase : Sophie Schuller.

Abstract. Glasses of the system R 2 O-B 2 O 3-SiO 2 exhibit metastable phase separation, which diminishes with increasing radius of the alkali-metal ion in the glass [1–7].

Because of the different rates of metastable phase separation processes, it is possible to obtain various intermediate structures [8, 9].Author: T. Dgebuadze. suitable delay for phase separation, the production data were then determined by reading the liquid levels in the cylinders with an accuracy of cm3.

Fig. 1—Schematic of the experimental setup. Fig. 2—Glass-bead flow model (width= cm). June SPE Journal Figure 6: Stable phase separation in the systems SiO 2-B 2 O 3-RO, mol% [1] Figure 7: Stable and metastable phase separation in binary alkali and alkaline earth silicates [2] During glass property modeling phase separation effects have to be considered, in the way that property values of phase separated glasses are excluded from the calculation.

VISCOUS FLUID FLOW Tasos C. Papanastasiou Georgios C. Georgiou Department of Mathematics and Statistics University of Cyprus Nicosia, Cyprus Andreas N. Alexandrou Department of Mechanical Engineering Worcester Polytechnic Institute Worcester, MA by Boca Raton London New York Washington, D.C.

CRC Press. by observing periodically the occurrence of phase separation. Investigation of water absorption of the water-free liquid crystal preconcentrates as the glass filter.

1 g of waterfree sample was placed on the G1 glass filter of the instrument In case of samples with 10 % water content an ideal viscous flow behaviour was observed which. 1. Introduction.

Liquid–liquid phase separation is an appealing mechanism for building materials with tailored materials such as polymers, silicate melts, or metallic alloys, exhibit liquid–liquid immiscibility under a critical a quench under the immiscibility dome, spinodal decomposition or nucleation and growth are first responsible for.

Viscosity-defined as a material’s resistance to flow deformation and is a function of shear rate or stress, with time and temperature dependence Viscoelasticity – is a property of a material that exhibits both viscous and elastic character.

Measurements of G’, G”, tan δ with respect to time, temperature. In order to analyze the volume relaxation process separately from the phase separation, we turned to the elegant model for structural relaxation in glasses near 84 J.H. Simmons / Refractive index and density in a borosilicate glass Table l Time lag before detection of phase separation by viscosity measurements Time Temperature (min) 21 Densification during supersolidus liquid phase sintering is analogous to viscous flow sintering.

As depicted in Figureprealloyed particles nucleate liquid at the particle neck, inside the grains, and along grain boundaries.

This combination turns the solid particle mushy, and once sufficient liquid forms along the grain boundaries the. The dynamics of phase separation is highly non-linear and diverse even for inertialess flow, featuring multiple coalescence and breakups: although some typical time scaling for the characteristic droplet size in the flow and cross-flow directions can be obtained, the full evolution cannot be characterized only by the capillary number.

The constraint in sample size imposed by the critical cooling rate necessary for glass formation using conventional casting techniques is possibly the most critical limitation for the extensive use of bulk metallic glasses (BMGs) in structural applications.

This drawback has been recently overcome by processing glass-forming systems via additive manufacturing, finally enabling the synthesis of.

The pore-scale flow mechanisms and the relative permeabilities during steady-state two-phase flow in a glass model pore network were studied experimentally for the case of strong wettability (θe flow rate ratio, and the viscosity ratio were changed systematically, while all other parameters were kept constant.

• Quench to below Tg to avoid phase separation • No phase separation when T>Tc or TViscous melts are less prone to phase separation than fluid melts (D∼η-1) Stable Immiscibility: Tc>Tliquidus (Tliq.

is maximum temperature at which crystals are stable in a melt). • very common (binary RO•SiO2, •GeO2, •B2O3 systems). Technical Notes National Advisory Committee For Aeronautics No. An Investigation Of The Phenomenon Of Separation In The Air Flow Around Simple Quadric Cylinders Investigation of viscous flow in glass during phase separation Volume NBS Technical Note [Leather Bound] [].

This book is printed in black & white, sewing. Industrial glass is produced at temperatures above °C, where glass becomes a highly viscous incompressible fluid, usually considered as Newtonian. In the production two phases may be distinguished, namely the pressing phase and the blowing phase.

Fig. 5 Skin exhibits pronounced phase separation dynamics during barrier formation. (A) (Left) Schematics of sagittal and planar views. (Right) Corresponding views of fluorescent sensor A in mouse skin. Planar skin views are through early, middle, and late granular layers.

nu, nucleus. Dotted lines denote cell boundaries. The separation of a viscous liquid at a straight edge - Volume 5 Issue 1 - D. H. Michael. It is well known that a first approximation to the flow of a viscous liquid in the neighbourhood of a boundary with a corner may be obtained by solving the linearized equations of momentum neglecting the inertia terms.

This has been done by Dean and. The effect of the particles on the flow of air is negligible. One-way coupling between the continuum phase and the discrete phase is used given the low concentration of the aerosol particles in air.

The particle trajectory is determined by solving the equation of. Descriptions of phase separation in condensed matter have so far been classified into a solid model (model B) and a fluid model (model H).

In the former the diffusion is the only transport process, while in the latter material can be transported by both diffusion and hydrodynamic flow.