INFLUENCE OF GEOMETRY OF CORRUGATED SURFACE ON THE STRUCTURE OF CURRENT AND INTENSITY OF HEAT TRANSFER IN A PIPE

Authors

DOI:

https://doi.org/10.20535/1813-5420.2.2018.147362

Keywords:

flow in the pipe, intensification of heat transfer, hydraulic resistance, flow structure, flow change, non-protective corrugation

Abstract

Numerical modeling of thermal and hydraulic processes in pipes with a different geometry parameters corrugated inserts was carried out. It was shown that in the range of Reynolds numbers 1,6·103...5,4·103 insertion of nonencumbering corrugated inserts allows to intensify heat exchange to 1,6 times. On the base of two dimensionless parameters: wavelength k1=l/R and amplitude of corrugated surface k3=2a/R the analysis of flow`s vortex structure in pipe and heat transfer mechanisms was carried out. Interrelation between those parameters and Reynolds number Red and length of initial section of the pipe was shown. Comparative analysis of shortwave and long-wave corrugation was carried out. Required number of waves depending on their length for the self-similar flow regime establishing was obtained. Recommendations on modeling of thermal and hydraulic processes depending on structured surface`s geometry were made. Value of the parameters k1, k3 was determined for the Reynolds Red for which value of hydraulic resistance in corrugated pipe was a minimal growth and heat transfer rate was a maximal in compared to smooth tube. The obtained values of hydraulic resistance in pipes with corrugated inserts do not exceed value of hydraulic resistance in smooth pipe more than 4%, which allows determine energy efficiency of pipes witn nonencumbering corrugated inserts only by Nusselt number.

Author Biographies

Oleksandra Oleksandrivna Baskova, National Technical University of Ukraine “Igor Sikorsky Kyiv Polytechnic Institute”

PhD

Hennadii Oleksandrovych Voropaiev, National Technical University of Ukraine “Igor Sikorsky Kyiv Polytechnic Institute”

Prof.

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Published

2018-10-01

Issue

Section

TECHNOLOGIES AND EQUIPMENT IN ENERGY