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传热学

DOI: 10.1615/HeatTransRes.v28.i4-6.270
pages 398-401

New Heat-Transfer Surfaces Made of Tubes with Rolled Petal Finning

E. N. Pis'mennyi
"Kiev Polytechnic Institute" National Technical University of Ukraine, Kiev
A. M. Terekh
National Technical University of Ukraine "Igor Sikorsky Kyiv Polytechnic Institute," 37 Peremogi Ave., Kyiv, 03056, Ukraine
V. A. Rogachov
National Technical University of Ukraine "Igor Sikorsky Kyiv Polytechnic Institute," 37 Peremogi Ave., Kyiv, 03056, Ukraine

ABSTRACT

Thermodynamic and aerodynamic characteristics of newly developed highly efficient heat-transfer surfaces are studied. The surfaces consist of bundles of aluminum tubes with transverse petal finning manufactured by a waste-free technology. It is shown that, for the flows with Reynolds numbers Red = 6·103 −6·104, the rate of convective heat transfer is 45% higher in the bundles of tubes with rolled petal finning as compared to tubes with the conventional nut-type or screw-type finnings. Such replacement of the conventional transversely finned tubes by tubes with petal finning (with all other factors being the same) is expected to allow an approximately 20% weight reduction of the corresponding heat-transfer units.


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