Transient gas density measurement using neutron radiography

Area of Science:

• Nuclear physics and engineering
• Fluid dynamics
• Materials science

Background:

• Optical and X-ray imaging are limited for opaque, complex geometries.
• Neutron attenuation's sensitivity to nuclear structure enables imaging of diverse materials.
• Internal flow visualization in inaccessible systems is a significant challenge.

Purpose of the Study:

• To demonstrate neutron radiography as a viable gasdynamic diagnostic technique.
• To apply neutron radiography for time-resolved interface tracking in a gas transfer system.
• To showcase the capability of neutron radiography for opaque, complex flow systems.

Main Methods:

• Utilized neutron radiography as a line-of-sight diagnostic.
• Focused on time-resolved imaging of gas-gas interfaces.
• Employed a gas transfer system with three pressure vessels and opaque tubing.

Main Results:

• Successfully determined the time-resolved gas-gas interface location.
• Demonstrated the effectiveness of neutron radiography in opaque, complex geometries.
• Confirmed neutron radiography's utility where optical methods fail.

Conclusions:

• Neutron radiography is a powerful tool for internal flow diagnostics in inaccessible systems.
• The technique offers unique advantages for imaging material combinations difficult for other methods.
• This study validates neutron radiography for real-time interface tracking in gasdynamic applications.