Heat trasfer of flat oval cylinders in cross flow
DOI:
https://doi.org/10.15587/1729-4061.2013.14832Keywords:
Нeat transfer, flow, cross, cylinder, tube, flat ovalAbstract
The article presents the results of the experimental study of convective heat transfer of single tubes of circular and flat oval profile in the range of variation of the relative elongation of the profile of the tubes from 1 (round tube) to 2.625. The experiments were conducted in an open-type wind tunnel of rectangular cross section in the range of Reynolds number from 3000 to 25000. The degree of turbulence Tu of the incoming flow was (3.5-4)%, relative length of the cylinders . The method of electric heating of the studied surface was used at which the inner wall of the tube was provided with constant heat flow, and the regular method of the cooling of bodies of simple geometric shape of the I-st kind (for round tube d = 16 mm) was applied, at which the conditions were provided.
The analysis of the data indicates that the heat exchange intensity of tubes of circular profile is higher than that of flat oval tubes at (16-35)% depending on the elongation of the profile. Its increase provides the reduction of heat transfer intensity. A generalized dependence was proposed to determine convective heat transfer coefficients of single flat oval tubes, which takes into account the effect on the heat transfer intensity of the relative elongation of the profileReferences
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Copyright (c) 2014 Олександр Михайлович Терех, Олександр Володимирович Семеняко, Валерій Омелянович Туз, Олександр Ігоревич Руденко, Вадим Анатолійович Кондратюк
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