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NATURAL CONVECTION HEAT TRANSFER FROM PARALLEL, HORIZONTAL CYLINDERS.

Author(s) : HUNTER R. G., CHATO J. C.

Summary

THE CONVECTIVE THERMAL INTERACTIONS BETWEEN PARALLEL, HORIZONTAL CYLINDERS OF 0.2 IN (5.2 MM) DIAMETER HAS BEEN INVESTIGATED EXPERIMENTALLY IN THE RAYLEIGH NUMBER RANGE OF 140 TO 550, WHICH CORRESPONDS TO THE OPERATING CONDITIONS OF AIR-COOLED HOUSEHOLD REFRIGERATOR CONDENSERS. THE CONFIGURATIONS USED WERE: (1) 2 CYLINDERS, ONE BELOW THE OTHER IN VERTICAL ALIGNMENT AND WITH HORIZONTAL OFFSET ; AND (2) 3 CYLINDERS, WITH 2 LOCATED IN A HORIZONTALLY SYMMETRICAL FASHION BELOW THE THIRD. WITH 2 CYLINDERS,THE MAXIMUM ENHANCEMENT OF THE HEAT TRANSFER, UP TO ABOUT 25%, OCCURRED ON THE TOP CYLINDER WHEN THE TWO WERE IN VERTICAL ALIGNMENT. THESE MAXIMA REQUIRED A VERTICAL SEPARATION DISTANCE OF THE ORDER OF 20 DIAMETERS. WITH 3 CYLINDERS, SIMILAR ENHANCEMENTS OCCURRED ON THE SINGLE TOP CYLINDER BUT AT SMALLER VERTICAL DISTANCES. THE OPTIMUM DISTANCE WAS ABOUT 3 DIAMETERS. IN THE CONFIGURATION THERE SEEMED TO BE A VERY SMALL ENHANCEMENT ON THE BOTTOM CYLINDERS AS WELL.

Details

  • Original title: NATURAL CONVECTION HEAT TRANSFER FROM PARALLEL, HORIZONTAL CYLINDERS.
  • Record ID : 1988-2237
  • Languages: English
  • Publication date: 1987
  • Source: Source: ASHRAE Trans.
    vol. 93; n. 2; 752-767; 9 fig.; 12 ref.
  • Document available for consultation in the library of the IIR headquarters only.

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