DETERMINATION OF BURNOUT LIMITS OF POLYPHENYL COOLANTS. Summary Report

Technical Report · Fri Feb 14 04:00:00 EST 1958

OSTI ID:4339221

Core, T C; Sato, K

An experimental investigation was conducted to establish the burnout limits of a pelyphenyl mixture (15% diphenyl, 58% ortho-terphenyl, 24% metaterphenyl, and 3% paraterphenyl), diphenyl, Santowax R, and monoisopropylbiphenyl for various pressures, fluid velocities, and fluid temperatures. The preheated liquid was passed through an electrically heated, 1/ 2-in.-OD tube (0.020-in. wall) with an unheated rod (0.188-in.diam) inserted concentrically to form an annular passage, with an equivalent hydraulic diameter of 0.272 in. The electrical power input to the tube was increased by increments until the tube was damaged and/or the outside-wall temperatures rose rapidly to a high value (indicating film-boiling). A best-fit correlation was obtained for the critical heat flux of the polyphenyl mixture. An empirical equation was obtained for the critical heat flux, (Q/A)/sub c/, of the 48 diphenyl tests: (Q/ A)/sub c/ = 454 DELTA T/sub sub/ V/sup 0.63/ + 116,000 (Btu/ft/ hr). The critical heat flux for the ten Santowax R tests was correlated by the following equation: (QA)/sub c/ = 552 DELTA T/sub sub/ V/sup 2/3 + 152,000 Btu/ft/ hr. A burnout correlation was not obtained with monoisopropylbiphenyl for the test conditions covered in this program. (auth)

• Research Organization: Aerojet-General Corp., Azusa, Calif.
• NSA Number: NSA-12-005322
• OSTI ID: 4339221
• Report Number(s): IDO-28007
• Country of Publication: United States
• Language: English

Related Subjects

BOILING
BURNOUT
CONFIGURATION
DEFECTS
ELECTRICITY
ENGINEERING
EQUATIONS
FILMS
FLUID FLOW
HEATING
MEASURED VALUES
ORGANIC COOLANT
POLYPHENYLS
PRESSURE
PROPYL RADICALS
RODS
TUBES
VELOCITY