HEAT-TRANSFER STUDIES ON A FORCED CONVECTION LOOP WITH BIPHENYL AND BIPHENYL POLYMERS
Technical Report
·
OSTI ID:4315892
The pumped loop at NRL is designed to study heat transfer characteristics of organic fiuids and the effect of pyrolytic decomposition products on heat transfer surfaces. The studies are based on the direct determination of film coefficients, over-all heat transfer coefficients, or both, on an electrically heated horizontal tube. Reliable film coefficients in the high turbulent region for biphenyl and two polymer-biphenyl mixtures (25% and 40% polymer) are presented and effectively correlated with an equation of the Dittus- Boelter type. Data showing a lack of fouling at surface temperatures of 850 deg F are presented for short term experiments with biphenyl and a low-polymer mixture (25% polymer). Plugging in gage and drain lines during loop operation, resulting from low solubility of paraquaterphenyl and/or higher parapolyphenyls, is discussed. Associated with the loop studies, physical properties for a number of phenyl compounds and mixtures were determined. Density and viscosity values are reported for biphenyl, metaterphenyl, paraterphenyl, monoisopropylbiphenyl, and two polymer-biphenyl mixtures. Equations are presented for extrapolation of the data to higher temperatures. Also, solubility values are reported for a number of phenyl compounds in biphenyl and other aromatic solvents. (auth)
- Research Organization:
- Naval Research Lab., Washington, D.C.
- NSA Number:
- NSA-12-003634
- OSTI ID:
- 4315892
- Report Number(s):
- NRL-4990
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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