Stabilized alumina/ethanol colloidal dispersion for seeding high temperature air flows
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Stabilized alumina/ethanol colloidal dispersion for seeding high temperature air flows

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Published by National Aeronautics and Space Administration, National Technical Information Service, distributor in [Washington, DC], [Springfield, Va .
Written in English

Subjects:

  • Aeronautical instruments.

Book details:

Edition Notes

StatementJudith H. Wernet and Mark P. Wernet.
SeriesNASA technical memorandum -- 106591.
ContributionsWernet, Mark P., United States. National Aeronautics and Space Administration.
The Physical Object
FormatMicroform
Pagination1 v.
ID Numbers
Open LibraryOL15398748M

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Get this from a library! Stabilized alumina/ethanol colloidal dispersion for seeding high temperature air flows. [Judith H Wernet; Mark P Wernet; United States. .   Seeding air flows with particles to enable measurements of gas velocities via laser anemometry and/or particle image velocimetry techniques can be quite exasperating. The seeding requirements are compounded when high temperature environments are encountered and special care must be used in selecting a refractory seed material. The pH stabilization techniques commonly Cited by: Stabilized Alumina/Ethanol Colloidal Dispersion for Seeding High Temperature Air Flows Seeding air flows with particles to enable measurements of gas velocities via laser anemometry and/or particle image velocimetry techniques can be quite exasperating. The seeding requirements are compounded when high temperature environments are encountered and special care must be used in selecting a. of a dispersion of alumina in ethanol to seed high temperature air flows typically encountered in centrifugal compressors [4]. Subsonic and transonic air flows are of particular interest in aerodynamic component testing. In such flow regimes. shock waves may be present and high temperatures are not uncommon. The presence of.

Laser anemometry enables the measurement of complex flow fields via the light scattered from small particles entrained in the flow. In the study of turboma.   Demonstration of a stabilized alumina/ethanol colloidal dispersion technique for seeding high temperature air flows Wernet, Mark P. By adding submicron alumina particles to a preadjusted pH solution of ethanol, a stable dispersion is obtained which when atomized, produces a high quality aerosol. Author: Mark P. Wernet, Gary J. Skoch, Judith H. Wernet.   The high purity α-alumina (AL SG4) used in this investigation was kindly supplied by M/s, Showa-denko, Tokyo, average particle size was μm with a specific surface area (BET) of m 2 /g. The detail physical and chemical properties are summarized in Table 1.A scanning electron micrograph (Model, JSMF, JEOL Tokyo, Japan) of alumina powder is shown in Fig. 1. The discussion covers seeding particle generation techniques and their supply into the flow facility from water experiments to aerodynamics and compressible reactive flows. The properties of HFSB tracers are given a specific attention, given their recent introduction for PIV experiments at large scale.

Stabilized Alumina/Ethanol Colloidal Dispersion for Seeding High Temperature Air Flows. By adding submicron alumina particles to a preadjusted pH solution of ethanol, a stable dispersion is obtained which when atomized produces a high quality aerosol. Commercial grade alumina powder is used with a moderate size distribution.   Dispersion stability of colloidal alumina particles in electroless nickel solutions is achieved with the aid of comb polyelectrolytes. Zeta potential measurements reveal reduced interactions between the particles and the electroless nickel solutions with the increase in comb polyelectrolyte coverage, and that the nature of dispersion stability is steric. Get this from a library! Demonstration of a stabilized alumina/ethanol colloidal dispersion technique for seeding high temperature air flows. [Mark P Wernet; Gary J Skoch; Judith H Wernet; United States. National Aeronautics and Space Administration.]. STABILIZATION OF HIGHLY CONCENTRATED ALUMINA SUSPENSIONS WITH DIFFERENT DISPERSANTS Summary Slip casting is a widely used colloidal technique for consolidation of ceramic powders from a suspension. The colloidal approach ensures homogeneous microstructure of a green body, thereby reducing post-sintering machining and production costs.