Accession Number : AD0684677

Title :   ALTERNATING NATURE OF THE FLOW AND HEAT TRANSFER IN THE TRANSITION REGION FROM LAMINAR TO TURBULENT CONDITIONS IN A TUBE,

Corporate Author : FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO

Personal Author(s) : Kalinin,E. K. ; Yarkho,S. A.

Report Date : 19 SEP 1968

Pagination or Media Count : 13

Abstract : The experiments were carried out in an apparatus which made it possible to investigate the hydraulic resistance and heat transfer in tubes with heating of water under the conditions q = const, and cooling of water at T = const. Diameter of the tube was 9.6 mm and the wall thickness 0.5 mm. A curve, based on the experimental results, shows the fluctuations in the temperature of the tube wall at different values of the Reynolds number. A second curve exhibits the dependence of the dimensionless amplitudes and frequencies of the fluctuations of the wall temperature on the Reynolds number at different cross sections is comparable, the nature of the temperature fluctuations becomes symmetrical, and the amplitudes are the greatest. At higher than critical values of the Reynolds number, the amplitudes of the fluctuations of the wall temperature decrease. The fact that the maximum amplitudes of the fluctuations decrease in cross section of the tube near the inlet is a result of higher Reynolds numbers. With a decrease of four times in the heat load, the maximum values of the amplitudes of the fluctuations at x/d = 73 decreased from delta T(max)/delta T(min) = 1.83 to 1.35. (Author)

Descriptors :   (*BOUNDARY LAYER TRANSITION, *HEAT TRANSFER), HYDRAULIC EQUIPMENT, DRAG, HEATING, REYNOLDS NUMBER, PIPES, TRANSITION TEMPERATURE, USSR

Subject Categories : Fluid Mechanics
      Thermodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE