1 / 12

Stephen Wolf

Chemically driven carbon- nanotube guided thermopower waves. Stephen Wolf. Basic Idea. External chemical combustion around a MWNT Anistropic thermal conductivity causes an acceleration of the reaction wave

kendis
Download Presentation

Stephen Wolf

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Chemically driven carbon-nanotubeguided thermopower waves Stephen Wolf

  2. Basic Idea • External chemical combustion around a MWNT • Anistropic thermal conductivity causes an acceleration of the reaction wave • Various effects upon associated effects, such as enhanced thermopower generation and propulsion.

  3. Synthesis • MWNT with a 7nm thick cyclotrimethylenetrinitramine (TNA, combustible element) coating • MWNT created with CVD • Wet impregnation of TNA

  4. Ignition and Reaction • TNA ignited with a laser or electrical discharge • Sustained reaction rates at 4-10 times bulk TNA reaction • Alignment critical to the process, no effect displayed at all with random alignments confirms the MWNT is the amplifier

  5. Graphs of reaction velocities (measured a,b) and theoretical(c)

  6. Thermopower Wave • This reaction wave and thermal gradient creates power by the Seebeck effect.

  7. Different compared to normal effect, or seebeck effect with slower waves Higher mass and center ignition Accelerated Waves

  8. Very high specific power • Specific power (energy per mass unit) was very high, comparable or greater than Li-ion depending on sample • Increasing specific power with smaller mass

  9. Smaller losses with smaller mass • A larger array allows for more orthogonal heat propagation • The orthogonal propagation is not as fast as the axial, more losses occur

  10. Pressure Waves • This reaction also creates very high pressure waves and can be used to create a microthruster with much higher figures of merit than others currently available

  11. Conclusion • High anistropic thermal conductivity in the CNT allows for guided, accelerated thermal reaction waves • These reaction waves lead to correspondingly unique pressure and thermopower waves • Applications for single use power supplies and microthrusters

  12. Questions?

More Related