Experimetal heat transfer investigation on horizontal cylinder during natural convection

Роман Володимирович Неїло, Валерій Омелянович Туз

Abstract



Despite the widespread and long-term investigation of heat transfer and hydrodynamics of a single horizontal cylinder in a large volume in conditions of free convection, both single approach to determining the intensity of heat transfer and final dependences of calculations are absent in the literature. The paper gives the results of the experimental study of heat transfer of the single horizontal cylin­der in conditions of free convection in the large volume, in the range of Rayleigh numbers: 9,1·103<Ra<1,7·105. The conclusion is drawn on the possibility of approximating the experimental results on one of the proposed in the literature dependences. In addition, the tem­perature distribution of the heat transfer agent around the cylinder was investigated. It was shown that the temperature of the medium changes sharply in the wall area and is almost unchanged in the rest of the volume. The temperature distribution is given in dimensionless coordinates, which correspond to both the most evident and the pro­posed in the literature. The experimental results are well coordinated with the results of mathematical modeling, presented in the literature. At the same time, comparing the results of measurements with the proposed in the literature analytical dependences of the dimension­less temperature distribution in the boundary layer, the conclusion is drawn on an underestimation of the rate of temperature change. To describe more accurately the change of the rate in the wall layer of the midship section is possible by the power dependence, with the indica­tor 7, not 2 - 4 as it is suggested in the literature.


Keywords


heat transfer; horizontal tube; free convection; heat emission; boundary layer

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ISSN (print) 1729-3774, ISSN (on-line) 1729-4061