Investigation on the Effects of Body Force Environment on Flat Heat Pipes

摘要: This paper reports on the effects of body forces environment: gravitation, vibration, and acceleration using constant heat load thermal performance a flat copper/water pipe. The effect gravitation is studied by testing pipe in different positions: horizontal, vertical with source upwards (antigravity position), downward (thermosyphon position). Transient accelerations vibrations are generated centrifuge shaking tables, respectively, order to simulate vibration corresponding aircraft maneuvering frequency, amplitude, duration, direction. experimental results orientation show that hardly affected exhibits nearly same whatever tilt angle for input powers lower than 20 W. For higher W, there slight dependency gravitation. tests mounted tri-axis table it subjected sinusoidal excitation. heat-pipe mounting direction table. An investigation into transient loads has been conducted. Pooling excess working fluid plays significant role transport potential accelerations. There decrease increasing as result partial dryout evaporator pooling condenser section. Dryout, which demonstrated increased acceleration, depends power type. However, under certain successfully reprimed suppression acceleration. In all cases increase resistance does not exceed 70%. maximum obtained 10-g level remains an acceptable value electronic package safety.