Evaluating the efficiency of closed two-phase thermosyphons based on experimental determination of temperatures in the characteristic cross sections of the working area

About the authors:

Vyacheslav I. Maksimov, Сand. Sci. (Tech.), Associate Professor, Butakov Research Center, Tomsk Polytechnic University; elf@tpu.ru

Atlant E. Nurpeiis, Сand. Sci. (Tech.), Assistant, Butakov Research Center, Tomsk Polytechnic University; nurpeiis_atlant@mail.ru

Abstract:

This article presents the results of the experimental determination of temperatures in the working channel of a closed two-phase thermosyphon. The authors have conducted experimental research using a copper thermosyphon with a height of 161 mm, sidewall thickness of 1.5 mm, and a bottom cover of 2 mm. The internal diameter of the evaporation part and the vapor channel was 39 mm.

According to the results, the temperature in characteristic sections of the working area (with distilled water and low-boiling liquid n-pentane as the main coolants) was determined as a function of the heat flux (from 0.3 to 9.5 kW/m² for distilled water and from 0.3 to 0.5 kW/m² for n-pentane) and the filling ratio (ε = 8%). The time taken to reach the stationary mode of characteristic temperatures was found to be rather long in the whole range of the heat fluxes. The obtained dependencies of the temperature differences along the thermosyphon height showed that under the maximum thermal loads for the conditions under consideration, the temperature differences in the vapor channel of the thermosyphon do not exceed 5 K for distilled water and 1.1 K for n-pentane.

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