Transient Response of an Oscillating Heat Pipe by a Pulsed Heating in a High Magnetic Field Environment

2015 ◽  
Vol 137 (3) ◽  
Author(s):  
C. D. Smoot ◽  
A. A. Hathaway ◽  
H. B. Ma ◽  
M. T. Crawford ◽  
B. M. Huhman ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Heat Pipe ◽  
High Magnetic Field ◽  
Pure Copper ◽  
Electric Discharges ◽  
Transient Heating ◽  
Oscillating Heat Pipe ◽  
Pulsed Heating ◽  
Field Environment ◽  
Heating Event

An experimental investigation of a compact, triple-layer oscillating heat pipe (OHP) has been conducted to determine the fast-transient heating effect on the heat transport capability of an OHP in a high magnetic field environment. The OHP has dimensions of 1.3 cm thick, 22.9 cm long, and 7.6 cm wide embedded with two-independent closed-loops forming three layers of channels. The OHP was directly clamped to a railgun system in a medium caliber launcher (MCL) and subjected to high current electric discharges occurring over several microseconds. The experimental results show that the OHP is capable of significantly reducing peak temperatures during a pulsed heating event over pure copper, even in the presence of relatively high magnetic fields.

Validation of a novel fiber optic strain gauge in a cryogenic and high magnetic field environment

Cryogenics ◽  
2010 ◽  
Vol 50 (10) ◽  
pp. 700-707 ◽  
Author(s):  
Scott Baxter ◽  
M’hamed Lakrimi ◽  
Adrian M. Thomas ◽  
Yunxin Gao ◽  
Hugh Blakes ◽  
...  
Keyword(s):  
Magnetic Field ◽  
High Magnetic Field ◽  
Strain Gauge ◽  
Fiber Optic ◽  
Field Environment

Heat Pipes in the Magnetic-Field Environment of a Fusion Reactor

1972 ◽  
Vol 94 (3) ◽  
pp. 282-288 ◽  
Author(s):  
G. A. Carlson ◽  
M. A. Hoffman
Keyword(s):  
Magnetic Field ◽  
Heat Pipe ◽  
Heat Pipes ◽  
Vapor Flow ◽  
Maximum Heat ◽  
Flow Passage ◽  
Field Environment ◽  
Fluid Properties ◽  
Pipe Geometry ◽  
The Magnetic Field

Heat pipes have been proposed for use in environments where there are strong magnetic fields such as in controlled fusion reactors. The presence of a magnetic field can influence the performance of a heat pipe significantly, depending on the heat-pipe geometry, its orientation in the magnetic field, the heat-pipe materials and fluid properties, as well as the magnetic-field strength. A liquid-metal heat pipe, specifically designed to operate in a magnetic field, will employ a compound wick structure with the optimum liquid-flow passage size larger and the vapor flow passage proportionately smaller than for the no-magnetic-field design. The basic conclusion is that the presence of a magnetic field always results in a lower maximum heat-flux capability, but the detrimental effects of the magnetic field can be greatly reduced by using a heat-pipe geometry optimized for operation in the specific magnetic-field environment.

Effects of high magnetic field annealing on the initial recrystallized texture in pure copper

2015 ◽  
Vol 29 (10n11) ◽  
pp. 1540020 ◽  
Author(s):  
Tong He ◽  
Yan Wang ◽  
Wei Sun ◽  
Xiang Zhao
Keyword(s):  
Magnetic Field ◽  
Grain Boundaries ◽  
High Magnetic Field ◽  
Pure Copper ◽  
Cube Texture ◽  
Magnetic Annealing ◽  
Final Annealing ◽  
Field Annealing ◽  
Cold Rolled ◽  
The Magnetic Field

The cold-rolled pure copper sheets were annealed with and without a high magnetic field of 12 T. The results showed that the magnetic annealing could promote the formation of the initial recrystallized cube texture. The magnetic annealing did not dramatically change the final annealing textures, but the intensity of the recrystallized cube texture is obviously different. The differences of the recrystallized cube orientation intensity between the specimens with and without the field annealing may be attributed to the effects of the magnetic field on the mobility of grain boundaries.

Experimental Investigation of Magnetic Field Effect on the Magnetic Nanofluid Oscillating Heat Pipe

2013 ◽  
Vol 5 (1) ◽  
Author(s):  
Nannan Zhao ◽  
Dianli Zhao ◽  
Hongbin Ma
Keyword(s):  
Magnetic Field ◽  
Heat Transfer ◽  
Heat Pipe ◽  
Field Effect ◽  
Heat Transfer Performance ◽  
Magnetic Field Effect ◽  
Magnetic Nanofluid ◽  
Oscillating Heat Pipe ◽  
Oscillating Motion ◽  
The Magnetic Field

The magnetic field effect on oscillating motion and heat transfer in an oscillating heat pipe (OHP) containing magnetic nanofluid was investigated experimentally. The nanofluid consisted of distilled water and dysprosium (III) oxide nanoparticles with an average size of 98 nm. A magnetic field was applied to the evaporating section of the OHP by using a permanent magnet. The heat pipes charged with magnetic nanofluids at mass ratios of 0.1%, 0.05%, and 0.01% were tested. In addition, the effects of orientation and input power ranging from 50 W to 250 W on the heat transport capability of the heat pipe were investigated. The experimental results demonstrate that the magnetic field can affect the oscillating motions and enhance the heat transfer performance of the magnetic nanofluid OHP. The magnetic nanoparticles in a magnetic field can reduce the startup power of oscillating motion and enhance the heat transfer performance.

Experimental Investigation of Magnetic Field Effect on the Magnetic Nanofluid Oscillating Heat Pipe

2012 ◽  
Author(s):  
Nannan Zhao ◽  
Dianli Zhao ◽  
Hongbin Ma
Keyword(s):  
Magnetic Field ◽  
Heat Transfer ◽  
Heat Pipe ◽  
Heat Transfer Performance ◽  
Magnetic Field Effect ◽  
Input Power ◽  
Magnetic Nanofluid ◽  
Oscillating Heat Pipe ◽  
Oscillating Motion ◽  
The Magnetic Field

The magnetic field effect on the oscillating motion and heat transfer in an oscillating heat pipe (OHP) containing magnetic nanofluid was investigated experimentally. The nanofluid consists of distilled water and Dysprosium (III) oxide nanoparticles with sizes less than 100 nm. A magnetic field was applied to the evaporating section of the OHP by using the permanent magnet. The heat pipes charged with magnetic nanofluids at mass ratios of 0.1%, 0.05%, and 0.01%, respectively, were tested. In addition, the effects of orientation and input power ranging from 50 W to 250 W on the heat transport capability of the heat pipe were investigated. The experimental results demonstrate that the magnetic field can affect the oscillating motions and enhance the heat transfer performance of the magnetic nanofluid OHP. The magnetic nanoparticles in a magnetic field can reduce the startup power of oscillating motion and enhance the heat transfer performance in a low input power.

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