Heat transfer intensity in the evaporation zone of two-phase thermosyphons

Authors

  • Володимир Юрійович Кравець National Technical University “Kyiv Politechnic Institute” Peremogy av. 37, Kyiv, Ukraine, 03056, Ukraine https://orcid.org/0000-0002-8891-0812
  • Валерий Иванович Коньшин National Technical University “Kyiv Politechnic Institute” Peremogy av. 37, Kyiv, Ukraine, 03056, Ukraine
  • Наталья Сергеевна Ванеева National Technical University “Kyiv Politechnic Institute” Peremogy av. 37, Kyiv, Ukraine, 03056, Ukraine

DOI:

https://doi.org/10.15587/1729-4061.2014.9717

Keywords:

thermosyphone, evaporation zone, condensation zone, heat flow, heat-transfer agent, heat-transfer coefficient, inclination angle, filling degree

Abstract

Decrease in the weight and size of electronic equipment with an increase in the functional capabilities leads to the growth of specific heat loads and their temperature modes that can cause failure of the entire device. Therefore, searching for effective systems of ensuring the set temperature modes of electronic device elements is a topical issue. Currently, passive evaporationcondensation devices in the form of closed two-phase thermosyphons have found wide use. Despite the considerable amount of studies on heat transfer characteristics of thermosyphons, there are difficulties in calculating the intensity of processes in them at the change in geometric parameters. One of the important parameters that affect the amount of transmitted heat energy of thermosyphons is their inner diameter.

The study of the influence of the internal diameter (5mm and 9mm) of two-phase700 mmlong thermosyphons on the heat transfer intensity in the heating zone for two heat-transfer agents (water and ethanol) is given in the paper. It is shown that, at the inner diameter decrease, the heat transfer intensity in the heating zone reduces. The thermosyphon inclination angle does not practically affect heat transfer coefficients in the heating zone.

The dependence, allowing to calculate the heat transfer intensity during ethanol boiling in the heating zone of the thermosyphon with the inner diameter9 mmand length700 mmis obtained.

Experimental data, obtained during the study are important for designing thermosyphons with optimal heat transfer parameters, as well as for efficient cooling systems.

Author Biographies

Володимир Юрійович Кравець, National Technical University “Kyiv Politechnic Institute” Peremogy av. 37, Kyiv, Ukraine, 03056

Ph.D., Associate Professor.

Department of nuclear power plants and engineering thermophysics

Валерий Иванович Коньшин, National Technical University “Kyiv Politechnic Institute” Peremogy av. 37, Kyiv, Ukraine, 03056

Ph.D., Associate Professor.

Department of nuclear power plants and engineering thermophysics

Наталья Сергеевна Ванеева, National Technical University “Kyiv Politechnic Institute” Peremogy av. 37, Kyiv, Ukraine, 03056

Undergraduate

Department of nuclear power plants and engineering thermophysics

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Published

2014-04-15

How to Cite

Кравець, В. Ю., Коньшин, В. И., & Ванеева, Н. С. (2014). Heat transfer intensity in the evaporation zone of two-phase thermosyphons. Eastern-European Journal of Enterprise Technologies, 2(5(68), 45–50. https://doi.org/10.15587/1729-4061.2014.9717

Issue

Vol. 2 No. 5(68) (2014): Applied physics

Section

Applied physics

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Copyright (c) 2014 Володимир Юрійович Кравець, Валерий Иванович Коньшин, Наталья Сергеевна Ванеева

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