DOI: https://doi.org/10.15587/1729-4061.2014.20066

Heat transfer of a single drop shaped cylinders in cross flow

Олександр Михайлович Терех, Олександр Володимирович Семеняко, Олександр Ігоревич Руденко, Вадим Анатолійович Кондратюк

Abstract


The paper is devoted to the studies of convective heat transfer for practically unstudied cylinders of a figurine drop-shaped form. The experiments have been carried out in a straight-through wind tunnel of a rectangular cross-section in the variation range of the Reynolds numbers from 4000 to 25000. The method of an electric heating of the surface under investigation has been used wherein the conditions of a constant heat flow density have been enabled over the pipe inner wall. During the experiments, the average convective heat transfer coefficients have been determined. The heat transfer level of the "straight"-form drop-shaped pipe is (20-30) % higher than of the "reverse" form. The obtained data have shown that the drop-shaped pipes have a lower heat transfer intensity compared to the pipes of a circular cross-section. The given results can serve as a basis for further studies related to the optimization of geometric dimensions of the pipes for various heat exchange equipment, possessing a high heat and aerodynamic efficiency.


Keywords


cylinder; profile; drop-shaped; plane-oval; oval; circular; flow; heat transfer; intensity; comparison

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Copyright (c) 2014 Олександр Михайлович Терех, Олександр Володимирович Семеняко, Олександр Ігоревич Руденко, Вадим Анатолійович Кондратюк

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