진동형 히트파이프의 작동특성에 대한 실험적 연구

The oscillating characteristics of slug vapor or plug liquid flow in a capillary tube called as oscillating heat pipe(OHP) is presented. The oscillation phenomena in a capillary tube including effects of capillary force, dimensions, gravitational force, and initial pressure distribution etc. of the working fluid were observed and this working conditions were considered to find the optimum design condition. While it demonstrates that the capillary tube diameter, heating-cooling length, slug bubble size, and unit cell numbers affect the heat transfer and oscillation performance, Also these various working parameters of the OHP significantly affect the frequency and amplitude of oscillating motion in the capillary tube. An experimental study of a closed loop oscillating heat pipe was conducted. The oscillating heat pipes charged with distilled water was tested. In a vertically oriented top heating mode, the oscillating phenomena of the slug flow in the oscillating heat pipe was observed. This paper attempts to investigate the thermal operation behavior of OHP in terms of oscillating behavior. In the present study, the working condition of OHP with the non-conventional heating/cooling mode was verified experimentally. Meanwhile, some promising and innovatory applications of the OHP are also proposed for future electric vehicles. This paper is expected which can provide the basic operation principle of OHP with uneven working condition.