Influence of the flow structure formation on heat transfer processes in tubes with spiral corrugated inserts

Authors

DOI:

https://doi.org/10.15587/1729-4061.2019.165852

Keywords:

partial corrugation, spiral corrugation, heat transfer in a tube, heat transfer enhancement, friction loss.

Abstract

In order to enhance heat transfer processes in elements of power equipment with minimal energy consumption, the concept of partial structure formation of the heat transfer surface was developed. To determine the energy efficiency of partial structure formation of the heat transfer surface with transitional Reynolds numbers, the surface in the form of spiral corrugation is considered. Partial spiral corrugation due to a change in the flow structure makes it possible to increase the convective component of heat transfer with a moderate increase in friction loss in a transient flow regime. Based on direct numerical simulation of the three-dimensional non-stationary flow structure in the initial section of the tube with a spiral corrugated insert with the shock inlet and transition Reynolds number, the relationship between the structure of the disturbed non-isothermal flow and heat transfer rate on the tube surface is shown. The influence of temperature head on the growth rate of perturbations of the boundary layer in the tube, in the boundaries of which low-frequency oscillatory flow processes are formed, leading to an increase in convective heat transfer rate, is shown. The flow nature and changes in hydrodynamic and thermal parameters in the corrugated insert are investigated. The degree of influence of the spiral corrugated insert, not blocking the flow area of the tube, on the development of natural oscillations in the tube is determined. The influence of the pitch of spiral corrugation to the tube axis on the thermal and hydrodynamic processes in it is investigated. The resulting heat transfer enhancement (up to 20 %) with a simultaneous increase in friction loss (up to 7.5 %) correlates with the experimental results of other authors with similar corrugations in the given range of Reynolds numbers.

Author Biographies

Oleksandra Baskova, Institute of Hydromechanics National Academy of Sciences of Ukraine Zhelyabova str., 8/4, Kyiv, Ukraine, 03680

Engineer of 1 category

Department of Hydrobionics and Boundary Layer Control

Gennadii Voropaiev, Institute of Hydromechanics National Academy of Sciences of Ukraine Zhelyabova str., 8/4, Kyiv, Ukraine, 03680

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

Department of Hydrobionics and Boundary Layer Control

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Published

2019-05-02

How to Cite

Baskova, O., & Voropaiev, G. (2019). Influence of the flow structure formation on heat transfer processes in tubes with spiral corrugated inserts. Eastern-European Journal of Enterprise Technologies, 3(8 (99), 29–35. https://doi.org/10.15587/1729-4061.2019.165852

Issue

Vol. 3 No. 8 (99) (2019): Energy-saving technologies and equipment

Section

Energy-saving technologies and equipment

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Copyright (c) 2019 Oleksandra Baskova, Gennadii Voropaiev

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