Abstract
The oscillating heat pipe (OHP) is a novel heat-transfer technique used in thermal engineering. Although the OHP offers many technical advantages, it has not yet been actually used in the sky. Motivated by the need to develop a cooling system for use in the balloon-borne General Anti-Particle Spectrometer (GAPS) project, we are developing OHP technologies. To demonstrate the thermal performances of an OHP in real balloon flight conditions, a scaled-down OHP model was launched by a stratospheric balloon in Japan. In this study, we report the results of the flight demonstration.
Highlights
The development of the oscillating heat pipe (OHP), or pulsating heat pipe, as a cooling system has grown from the General Anti-Particle Spectrometer (GAPS) project
GAPS will conduct this cosmic-ray observation from longduration balloon (LDB) °ights over Antarctica
The OHP has many advantages over a conventional heat pipe, including simple fabrication as the capillary tube needs no internal wick, less sensitivity to orientation or gravitational pull, the capacity for large-scale heat transfer, and the ability to adapt to a low heat °ux
Summary
The development of the oscillating heat pipe (OHP), or pulsating heat pipe, as a cooling system has grown from the General Anti-Particle Spectrometer (GAPS) project. The GAPS project requires heat energy of approximately 100 W to be transferred across a distance of more than 2 m This is to be achieved using an OHP with 36 turns. Before moving to full-scale deployment (Okazaki et al, 2014), a °ight This is an Open Access article published by World Scientic Publishing Company. Demonstration has been conducted by mounting a scaled-down OHP as a part of the payload of an engineering balloon experiment called \pGAPS" (prototype-GAPS) (Fuke et al, 2014; Mognet et al, 2014). Initial reports of this OHP °ight demonstration were presented by Fuke et al (2012) and Okazaki et al (2012). We present details of the balloon-°ight demonstration of the \pGAPS OHP" that have not been reported previously
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