HEAT TRANSFER TO MERCURY FLOWING IN-LINE THROUGH A BUNDLE OF CIRCULAR RODS

Technical Report · Thu Jan 31 04:00:00 EST 1963

OSTI ID:4747776

Maresca, M W; Dwyer, O E

Experimental results for the case of in-line flow of mercury through an unbaffled bundle of circular rods were compared with theoretical predictions. The bundle consisted of 13 one-half-inch-diameter rods of the calrod type arranged in an equilateral triangular pattern, the pitch: diameter ratio being 1.750. Measurements were taken only on the central rod. Six different rods were tested. All rods in the bundle were electrically heated to provide equal and uniform heat fluxes throughout the bundle. The test rods had copper sheaths with fine thermocouples imbedded below the surface for measuring surface temperatures. Some rods were plated with a layer of nickel, followed by a very thin layer of copper, to provide wetting'' conditions, while others were chrome-plated to provide non-wetting'' conditions. The precision of the results is estimated to be within 2 to 3%. An interesting finding, consistent with earlier predictions, was that the Nusselt number. under fully-established turbulent-flow conditions, remained essentially constant until a Reynolds number of about 40,000 was reached. (auth)

• Research Organization: Brookhaven National Lab., Upton, N.Y.
• DOE Contract Number: AT(30-2)-GEN-16
• NSA Number: NSA-17-016222
• OSTI ID: 4747776
• Report Number(s): BNL-6826
• Country of Publication: United States
• Language: English

Related Subjects

ADHESION
CHROMIUM
COPPER
DISTRIBUTION
ELECTRICITY
ENGINEERING AND EQUIPMENT
FLUID FLOW
HEAT TRANSFER
HEATING
LABORATORY EQUIPMENT
LIQUID FLOW
LIQUID METALS
MEASURED VALUES
MERCURY
NICKEL
NUSSELT NUMBER
PIPES
PLATING
REYNOLDS NUMBER
SURFACES
TEMPERATURE
THERMOCOUPLES
THERMODYNAMICS
TUBES
TURBULENCE