scholarly journals Effect of Localized Heating on Three-Dimensional Flat-Plate Oscillating Heat Pipe

2010 ◽  
Vol 2 ◽  
pp. 465153 ◽  
Author(s):  
S. M. Thompson ◽  
H. B. Ma
Keyword(s):  
Flat Plate ◽  
Heat Pipe ◽  
Three Dimensional ◽  
Oscillating Heat Pipe ◽  
Localized Heating

An Experimental Investigation of Three-Dimensional Flat-Plate Oscillating Heat Pipe

2009 ◽  
Author(s):  
Scott M. Thompson ◽  
Hongbin Ma ◽  
Robert A. Winholtz ◽  
Corey Wilson
Keyword(s):  
Experimental Investigation ◽  
Flat Plate ◽  
Heat Pipe ◽  
Three Dimensional ◽  
Neutron Imaging ◽  
Heat Fluxes ◽  
Working Fluid ◽  
Oscillating Heat Pipe ◽  
Oscillatory Pattern ◽  
Thermal Oscillations

An experimental investigation on the effects of condenser temperatures, heating modes and heat inputs on a miniature, three dimensional flat-plate oscillating heat pipe (3D FP-OHP) was conducted visually and thermally. The 3D FP-OHP was charged with acetone at a filling ratio of 0.80, had dimensions of 101.60 × 63.50 × 2.54 mm3, possessed 30 total turns, and had square channels on both sides of the device with a hydraulic diameter of 0.762 mm. Unlike traditional flat-plate designs, this new three-dimensional, compact design allows for multiple heating arrangements and higher heat fluxes. Transient and steady-state temperature measurements were collected at various heat inputs and the activation/start-up was clearly observed for both bottom and side heating modes during reception of its excitation power for this miniature 3D FP-OHP. The neutron imaging technology was simultaneously employed to observe the internal working fluid flow for all tests directly through the heat pipe’s copper wall. The activation was accompanied with a pronounced temperature field relaxation and the onset of chaotic thermal oscillations — all occurring with the same general oscillatory pattern at locations all around the 3D FP-OHP. Qualitative and quantitative analysis of these thermal oscillations, along with the presentation of the average temperature difference and thermal resistance, for all experimental conditions are provided. The novelty of the three-dimensional OHP design is its ability to still produce the oscillating motions of liquid plugs and vapor bubbles and, more importantly, its ability to remove higher heat fluxes.

Experimental Investigation of Miniature Three-Dimensional Flat-Plate Oscillating Heat Pipe

2009 ◽  
Vol 131 (4) ◽  
Author(s):  
S. M. Thompson ◽  
H. B. Ma ◽  
R. A. Winholtz ◽  
C. Wilson
Keyword(s):  
Experimental Investigation ◽  
Flat Plate ◽  
Heat Pipe ◽  
Three Dimensional ◽  
Neutron Imaging ◽  
Heat Fluxes ◽  
Working Fluid ◽  
Oscillating Heat Pipe ◽  
Oscillatory Pattern ◽  
Thermal Oscillations

An experimental investigation on the effects of condenser temperatures, heating modes, and heat inputs on a miniature three-dimensional (3D) flat-plate oscillating heat pipe (FP-OHP) was conducted visually and thermally. The 3D FP-OHP was charged with acetone at a filling ratio of 0.80, had dimensions of 101.60×63.50×2.54 mm3, possessed 30 total turns, and had square channels on both sides of the device with a hydraulic diameter of 0.762 mm. Unlike traditional flat-plate designs, this new three-dimensional compact design allows for multiple heating arrangements and higher heat fluxes. Transient and steady-state temperature measurements were collected at various heat inputs, and the activation/start-up of the OHP was clearly observed for both bottom and side heating modes during reception of its excitation power for this miniature 3D FP-OHP. The neutron imaging technology was simultaneously employed to observe the internal working fluid flow for all tests directly through the copper wall. The activation was accompanied with a pronounced temperature field relaxation and the onset of chaotic thermal oscillations occurring with the same general oscillatory pattern at locations all around the 3D FP-OHP. Qualitative and quantitative analysis of these thermal oscillations, along with the presentation of the average temperature difference and thermal resistance, for all experimental conditions are provided. The novelty of the three-dimensional OHP design is its ability to still produce the oscillating motions of liquid plugs and vapor bubbles and, more importantly, its ability to remove higher heat fluxes.

Experimental Investigation of a Flat-Plate Oscillating Heat Pipe During High-Gravity Loading

2011 ◽  
Author(s):  
Hongbin Ma ◽  
Scott M. Thompson ◽  
Aaron A. Hathaway ◽  
Chris D. Smoot ◽  
Corey A. Wilson ◽  
...  
Keyword(s):  
Flat Plate ◽  
Heat Pipe ◽  
Heat Transfer Performance ◽  
Unique Feature ◽  
Three Dimensional ◽  
High Gravity ◽  
Transfer Performance ◽  
Oscillating Heat Pipe ◽  
Novel Design ◽  
Independent Heat

The thermal performance of a miniature, three-dimensional flat-plate oscillating heat pipe (3D FP-OHP) was experimentally investigated during high gravity loading with non-favorable evaporator positioning. The heat pipe had dimensions of 3.0 × 3.0 × 0.254 cm3 and utilized a novel design concept incorporating a two-layer channel arrangement. The device was charged with acetone and tested at a heat input of 95 W within a spin-table centrifuge. It was found that the heat pipe operated and performed near-independent of the investigated hyper-gravity loading up to 10g. Results show that at ten times the acceleration due to gravity (10g) the effective thermal conductivity was almost constant and even slightly increased which is very different from a conventional heat pipe. The gravity-independent heat transfer performance provides a unique feature of OHPs.

Robust Thermal Performance of a Flat-Plate Oscillating Heat Pipe During High-Gravity Loading

2011 ◽  
Vol 133 (10) ◽  
Author(s):  
S. M. Thompson ◽  
A. A. Hathaway ◽  
C. D. Smoot ◽  
C. A. Wilson ◽  
H. B. Ma ◽  
...  
Keyword(s):  
Flat Plate ◽  
Heat Pipe ◽  
Thermal Performance ◽  
Heat Transfer Performance ◽  
Unique Feature ◽  
Three Dimensional ◽  
High Gravity ◽  
Oscillating Heat Pipe ◽  
Novel Design ◽  
Independent Heat

The thermal performance of a miniature, three-dimensional flat-plate oscillating heat pipe (3D FP-OHP) was experimentally investigated during high-gravity loading with nonfavorable evaporator positioning. The heat pipe had dimensions of 3.0 × 3.0 × 0.254 cm3 and utilized a novel design concept incorporating a two-layer channel arrangement. The device was charged with acetone and tested at a heat input of 95 W within a spin-table centrifuge. It was found that the heat pipe operated and performed near-independent of the investigated hypergravity loading up to 10 g. Results show that at ten times the acceleration due to gravity (10 g), the effective thermal conductivity was almost constant and even slightly increased which is very different from a conventional heat pipe. The gravity-independent heat transfer performance provides a unique feature of OHPs.

Structure optimization of a three-dimensional coil oscillating heat pipe

2021 ◽  
pp. 122229
Author(s):  
Lilin Chu ◽  
Yulong Ji ◽  
Zhang Liu ◽  
Chunrong Yu ◽  
Zhenting Wu ◽  
...  
Keyword(s):  
Heat Pipe ◽  
Three Dimensional ◽  
Structure Optimization ◽  
Oscillating Heat Pipe
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