Oscillating Heat Pipes

Miyazaki, Yuji; Polasek, F.; Akachi, H.

doi:10.4271/2000-01-2375

Cited by 29 publications

(17 citation statements)

References 2 publications

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“…The superscript "+" in formula (2) implies that only a positive value of the term in square brackets is to be considered, and the term is to be considered as zero if it has a negative value. Further, the angle of inclination, β, varies between 0°-75°.…”

Section: Convective Heat Transfer Coefficientmentioning

confidence: 99%

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Effect of working-fluid filling ratio and cooling-water flow rate on the performance of solar collector with closed-loop oscillating heat pipe

2012

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This study experimentally investigated the effect of the working-fluid filling ratio (FR) and the cooling-water flow rate (CWFR) on the top heat loss and the performance of a solar collector equipped with a closed-loop oscillating heat pipe (CLOHP). The CLOHP was composed of a heating section, a cooling section, and an adiabatic section; it had a 0.002-m internal diameter and eight turns. The heating section was attached to a copper plate coated with black chrome, which absorbed energy from a solar simulator that had 12 halogen lamps and was controlled by a voltage regulator. The cooling section was inserted into the collector's cooling box, which was made of a transparent acrylic plate. The FR of the working fluid ranged from 30% to 80% with a 10% interval, and the CWFRs were 0.15 l/min, 0.30 l/min, and 0.45 l/min. The experimental results show that the solar collector equipped with the CLOHP has good performance at working-fluid FRs of 60% and 70% with low flow rates of 0.15 l/min and 0.30 l/min.

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Section: Convective Heat Transfer Coefficientmentioning

confidence: 99%

“…It gives high performance because of the high latent heat of vaporization and condensation of the working fluid and also has a simple structure and a fast thermal response. During the past decade, some researchers have studied the thermal transfer characteristics of the oscillating heat pipes (OHPs) [1][2][3][4][5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Effect of working-fluid filling ratio and cooling-water flow rate on the performance of solar collector with closed-loop oscillating heat pipe

2012

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“…Authors of some early research papers [2] studied a horizontal closed-end oscillating heat-pipe (HCEOHP) system and established a correlation that predicted the heat-transfer characteristics of the system. The CLOHP/CVs under normal operating conditions is capable of controlling the flow direction of the working fluid [3]. Previous research [4] established a correlation that predicted the heat-transfer performance of such a system at a bottom mode orientation (when evaporator sections are over the condenser sections).…”

Section: Introductionmentioning

confidence: 99%

Thermal performance of horizontal closed-loop oscillating heat-pipe with check valves

2010

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This research investigated the thermal performance of various horizontal closed-loop oscillating heat-pipe systems with check valves (HCLOHPs/CVs). Numerous test systems were constructed using copper capillary tubes with assorted inner diameters, evaporator lengths, and check valves. The test systems were evaluated under normal operating conditions using ethanol, R123, and distilled water as working fluids. The system's evaporator sections were heated by hot water from a hot bath, and the heat was removed from the condenser sections by cold water from a cool bath. The adiabatic sections were well insulated with foam insulators. The heat-transfer performance of the various systems was evaluated in terms of the rate of heat transferred to the cold water at the condenser. The results showed that the heat-transfer performance of an HCLOHP/CV system could be improved by decreasing the evaporator length. The highest performance of all tested systems was obtained when the maximum number of system check valves was 2. The maximum heat flux occurred with a 2 mm inner diameter tube, and R123 was determined to be the most suitable working fluid.

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“…To overcome the disadvantages of conventional heat pipes, oscillating heat pipes [8] have been proposed and investigated. Oscillating heat pipes uses the phenomenon of self-sustaining oscillatory flow of working fluid.…”

Section: Step Mission Payloads and Features Of The Non-explosive mentioning

confidence: 99%

Structural Design and Analysis of 1U Standardized STEP Cube Lab for On-Orbit Verification of Fundamental Space Technologies

Oh¹,

Jeon²,

Kwon³

2014

IJMMM

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Abstract-The STEP Cube Lab (Cube Laboratory for Space Technology Experimental Projects) is a 1U cube satellite developed by the Space Technology Synthesis Laboratory of Chosun University to be launched in 2015. Its mission objective is twofold: to determine which of the fundamental space technologies researched at domestic universities, will be potential candidates for use in future space missions and to verify the effectiveness of the technologies by investigating mission data obtained from on-orbit operation of the cube satellite. In this paper, a structural design concept based on the 1U standard to achieve the mission objective is introduced. The validity of the design has been demonstrated by quasi-static analysis and modal analysis. In addition, a non-explosive separation device triggered by burn wire heating, which is one of the main mission payloads is introduced.Index Terms-CubeSat, pico-class satellite, structural design, non-explosive separation mechanism.

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Oscillating Heat Pipes

Cited by 29 publications

References 2 publications

Effect of working-fluid filling ratio and cooling-water flow rate on the performance of solar collector with closed-loop oscillating heat pipe

Effect of working-fluid filling ratio and cooling-water flow rate on the performance of solar collector with closed-loop oscillating heat pipe

Thermal performance of horizontal closed-loop oscillating heat-pipe with check valves

Structural Design and Analysis of 1U Standardized STEP Cube Lab for On-Orbit Verification of Fundamental Space Technologies

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