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Pulsating heat pipes (PHP) have attracted industry attention as a promising heat transfer device for automobiles and aeronautics. In these applications, PHP might be exposed to a vibration environment. However, only a few studies have investigated the impact of vibration. The present study reports vibration test results by changing the PHP orientations and vibration directions, aiming to provide a complete view of the vibration impact on PHP performance under low to high frequencies (5-2000 Hz) typically applied for aeronautical applications. Moreover, a random vibration test was also performed to see the influence of actual vibration. The PHP was designed for electronics mounted on aeronautical vehicles. Although the number of turns was limited to six due to the envelope constraints, thanks to three different cross-sectional geometries, the PHP operated in a horizontal orientation as well as in bottom-heated mode. The results of the sine-sweep and sine-dwell tests showed PHP performance was affected by the vibration from 20 to 70 Hz that gave the maximum acceleration of 7g: in most cases, the performance degraded except for a couple of cases in which the vibration direction was perpendicular to the fluid oscillation. The random vibration generally had less impact than the other tests.
Naoko Iwata, Vincent Dupont and Antoine de Ryckel
Joint 22nd IHPC and 16th IHPS
Joint 22nd IHPC and 16th IHPS
