Investigation of flow structure and heat exchange formation in corrugated pipes at transient reynolds numbers

Authors

DOI:

https://doi.org/10.15587/1729-4061.2017.103880

Keywords:

corrugated pipe, inlet pipe section, heat transfer intensification, hydraulic resistance, vortex structure

Abstract

The problem of convective heat transfer in the initial section of a pipe with a corrugated section was considered at transient Reynolds numbers. Influence on the intensity of heat exchange and the magnitude of hydraulic resistance of geometric parameters (wavelength and amplitude) of the corrugated insert, variability of the thermophysical properties of the heat carrier and the direction of the heat flow was estimated. Threshold value of the corrugation wavelength (L/R0>0.6) was determined for the Reynolds number range under consideration for which there was a significant growth of heat exchange. Influence of the gradient of the dynamic viscosity coefficient on flow stability and intensification of heat exchange in internal flows was demonstrated. Influence of Reynolds and Prandtl numbers on local heat transfer, hydraulic resistance and flow structure was determined. It was established that the use of corrugated surfaces is ineffective at Reynolds numbers less than 2000. It was shown that heat exchange in a pipe can be raised to 30 % with an increase in hydraulic resistance of 1.05 times in the range of Reynolds numbers 2·103...1.4·104 with the use of a nonencumbering corrugation.

Author Biographies

Oleksandra Bascova, National Technical University of Ukraine "Igor Sikorsky Kyiv Polytechnic Institute" Peremohy ave., 37, Kyiv, Ukraine, 03056

Postgraduate student

Department of Nuclear Power Plants and Engineering Thermophysics

Gennadii Voropaiev, Institute of Hydromechanics National Academy of Sciences of Ukraine Zhelyabova str., 8/4, Kyiv, Ukraine, 03057

Doctor of Physical and Mathematical Sciences, Professor, Head of Department

Department of Hydrobionics and Boundary Layer Control

References

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Published

2017-06-30

How to Cite

Bascova, O., & Voropaiev, G. (2017). Investigation of flow structure and heat exchange formation in corrugated pipes at transient reynolds numbers. Eastern-European Journal of Enterprise Technologies, 3(8 (87), 40–45. https://doi.org/10.15587/1729-4061.2017.103880

Issue

Vol. 3 No. 8 (87) (2017): Energy-saving technologies and equipment

Section

Energy-saving technologies and equipment

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Copyright (c) 2017 Oleksandra Bascova, Gennadii Voropaiev

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