Resonant vibration heat transfer coefficient increase of short low-temperature heat pipes

Abstract

The results of heat transfer coefficient studies of the short linear heat pipes (HP's) with a formed by a capillary-porous insert vapour channel in the Laval nozzle-liked form at high heat power loads and external vibrations are presented. At high heat power loads, vaporization process in the capillary-porous evaporator and vapour propagation in the channel acquires a pulsating character with a frequency of 400–500 Hz and amplitude up to 103 Pa. It is shown that under external longitudinal vibration attached to the HP's body with an limited amplitude of 0.15 mm and frequency equal to the frequency of arising internal vapour pulsations, the HP's heat transfer coefficient shows the resonance nature and increases by to 20%. The increase in the heat transfer coefficient is due to the boiling process intensification in the grid HP's capillary-porous evaporator.