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Title: COMMENTS ON THE ANGLE OF REPOSE OF AQUEOUS ThO$sub 2$ SLURRIES

Abstract

aqueous thorium oxide slurries have arisen in connection with the design of the lower portion of the blanket pressure vessel and its associated piping. The literaiure review on the angle of repose of various dry solids by Mrs. B. S. Neumann in J. J. Hermans' book on''Flow Properties of Dispersed Systems'' is summarized. Mrs. Neumann points out that both a dynamic and static angle of repose have been observed with the angles for dynamic systems being larger than for static systems. Results are reported for two different types of experiments with slurry discharged from run 200A-14 which gave static angles of repose of 45 to 50 deg and dynamic angles of 65 to 75 deg . (auth)

Authors:
Publication Date:
Research Org.:
Oak Ridge National Lab., Tenn.
OSTI Identifier:
4308371
Report Number(s):
CF-58-2-76
NSA Number:
NSA-12-006005
DOE Contract Number:
W-7405-ENG-26
Resource Type:
Technical Report
Resource Relation:
Other Information: Orig. Receipt Date: 31-DEC-58
Country of Publication:
United States
Language:
English
Subject:
PHYSICS; BIBLIOGRAPHY; BLANKETS; SLURRIES; THORIUM OXIDES; VESSELS; WATER

Citation Formats

Thomas, D.G.. COMMENTS ON THE ANGLE OF REPOSE OF AQUEOUS ThO$sub 2$ SLURRIES. United States: N. p., 1958. Web. doi:10.2172/4308371.
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Thomas, D.G.. COMMENTS ON THE ANGLE OF REPOSE OF AQUEOUS ThO$sub 2$ SLURRIES. United States. doi:10.2172/4308371.
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Thomas, D.G.. Fri . "COMMENTS ON THE ANGLE OF REPOSE OF AQUEOUS ThO$sub 2$ SLURRIES". United States. doi:10.2172/4308371. https://www.osti.gov/servlets/purl/4308371.
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@article{osti_4308371,
title = {COMMENTS ON THE ANGLE OF REPOSE OF AQUEOUS ThO$sub 2$ SLURRIES},
author = {Thomas, D.G.},
abstractNote = {aqueous thorium oxide slurries have arisen in connection with the design of the lower portion of the blanket pressure vessel and its associated piping. The literaiure review on the angle of repose of various dry solids by Mrs. B. S. Neumann in J. J. Hermans' book on''Flow Properties of Dispersed Systems'' is summarized. Mrs. Neumann points out that both a dynamic and static angle of repose have been observed with the angles for dynamic systems being larger than for static systems. Results are reported for two different types of experiments with slurry discharged from run 200A-14 which gave static angles of repose of 45 to 50 deg and dynamic angles of 65 to 75 deg . (auth)},
doi = {10.2172/4308371},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Fri Feb 14 00:00:00 EST 1958},
month = {Fri Feb 14 00:00:00 EST 1958}
}
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Technical Report:
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DOI:  10.2172/4308371
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  • ; ;
    Nucleate-boiling heat-transfer measurements were made with aqueous thorium oxide slurries containing up to about 1000 g of Th per kg of H/sub 2/O (0.105 volume fraction of solids, 1- to 3- mu average diameter). Boiling took place from the surface of 1/16- and 1/8-in.-diam. platinum tubes submerged in slurry. The results may be represented in terms of the equation q/A = K( DELTA T)n, where q/A = heat flux, Btu/(hr) (ft/sup 2/) K = dimensional constant, DELTA T = temperature difference between heated tube wall and bulk slurry temperature, deg F. For the slurries studied, the heat flux at amore » 4T of 10 deg F was about 10/ sup 4/ ever, the value of the exponent, n, decreased as the volume fraction of solids was increased. The value of n was 3.3 with no thorium oxide present and approached unity at a voiume fraction of solids of 0.10. The maximum heat fiux attainable under nucleate-boiling conditions (often called the critical heat flux or burnout heat flux) at slurry concentrations of 200 g of Th per kg of H/sub 2/O was about the same as for water. However, at a concentration of 1000 g of Th per kg of H/sub 2/O, the burnout heat flux was 210,000 Btu/(hr)(ft/sub 2/), compared with a value of 490,000 Btu/(hr)(ft/sub 2/) for water under corresponding conditions. At constant heat flux, the temperature difference between the heated tube surface and the fluid saturation temperature increased 5 to 6 deg F per hour. This result might be explained by a ''soft'' film that surrounded the heated metal surface. This film was apparently less than 1/32 in. thick and was never distinguishable as an adhering film after the tube was removed from the slurry system. No hard cakes were observed on the surface from which boiling took place during any of the tests. The nucleate-boiling tests were made with aqueous thorium oxide slurries which had non-Newtonian laminar flow characteristics and which were almost Newtonian under turbulent flow conditions. No phenomena were observed which could be attributed to the effect of the solid particles on the gross physical properties of the slurry; for example, the nonNewtonian laminar flow characteristics of the slurry had no discernible effect on the nucleate- boiling heat transfer. (auth)« less

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    A simple method for measuring the settling rates of slurries at elevated temperatures and pressures is described. The useful ranges of the method, its limitations, and typical test results for thoria-urania slurries are presented. (auth)