Heat Transfer and Pressure Drop in a Compact Pin-Fin Heat Exchanger with PinOrientation at 18 deg to the Flow Direction

摘要

The authors have measured the heat transfer and pressure drop characteristics ofa novel, compact heat exchanger in helium gas at 3.5 MPa and Reynolds numbers of 450 to 12,000. The 'pin-fin' specimen consisted of pins, 0.51 mm high and spaced 2.03 mm on centers, spanning a channel through which the helium flows; the angle of the row of pins to the flow direction was 18 degrees. The specimen was radiatively heated on the top side at heat fluxes up to 74 W/sq cm and insulated on the back side. Correlations were developed for the friction factor and Nusselt number. The Nusselt number compares favorably to those of past studies of staggered pin-fins, when the measured temperatures are extrapolated to the temperature of the wall-fluid interface.