Neutron Imaging of Oscillating Heat Pipes

The dynamics of oscillating heat pipes were studied with neutron radiographic imaging at the Neutron Imaging Facility at the NIST Center for Neutron Research. Neutrons are more heavily attenuated by hydrogen than the typical metals in engineering devices. Thus, fluids like water and acetone can be visualized in neutron radiographs while contained within metallic structures. The facility is capable of producing 30 images a second enabling real-time video to be produced and the dynamics of the fluid motions within the heat pipes to studied.


Test 7-15

10 Turn Oscillating Heat Pipe – Closed Loop
Working Fluid = Water
Heat Input = 201 W
Condenser Temperature = 60 °C
Orientation = 0°
Steady State Conditions
Fill Ratio approximately 0.45

Neutron Video

Test 2-22

6 Turn Oscillating Heat Pipe – Open Loop
Working Fluid = Aceton
Heat Input = 102 W
Condenser Temperature = xx °C
Orientation = 90°
Steady State Conditions
Fill Ratio = 0.45

Test 5-24

6 Turn Oscillating Heat Pipe – Closed Loop
Working Fluid = Acetone
Heat Input = 98 W
Condenser Temperature = 60 °C
Orientation = 90°
Steady State Conditions
Fill Ratio = 0.48

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