1 / 16

Thermophones by Quantum Mechanics

Thermophones by Quantum Mechanics. Thomas Prevenslik QED Radiations Discovery Bay, Hong Kong. 1. Introduction. Over a century ago, Stokes communicated to the Royal Society in 1880 the finding by Preece that electrical wires produced sound.

padillar
Télécharger la présentation

Thermophones by Quantum Mechanics

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. Thermophones by Quantum Mechanics Thomas Prevenslik QED Radiations Discovery Bay, Hong Kong 1 12th Intersociety Conf. Thermal Phenomenon in Electronic Systems ; June 2-5, 2010, Las Vegas

  2. Introduction Over a century ago, Stokes communicated to the Royal Society in 1880 the finding by Preece that electrical wires produced sound. In 1914, Rayleigh reported de Lange’s thermophone invention to the Royal Society 2 12th Intersociety Conf. Thermal Phenomenon in Electronic Systems ; June 2-5, 2010, Las Vegas

  3. Theory First presented by Arnold & Crandall in 1917. Classical heat transfer was used to determine the temperatures that cause the film vibrations that produce sound from air pressure changes 3 12th Intersociety Conf. Thermal Phenomenon in Electronic Systems ; June 2-5, 2010, Las Vegas

  4. Modified Theory In 2008, Xiao et al. showed sound was produced in thin films of CNTs. But the data could not be fit to the Arnold & Crandall theory. Modification allowed additional heat loss Qo to the air. 4 12th Intersociety Conf. Thermal Phenomenon in Electronic Systems ; June 2-5, 2010, Las Vegas

  5. Shimoda et al.* previously questionedwhetherthe filmcan even respond at ultrasonic frequencies. * “Thermally induced ultrasonic emission from porous silicon,” Letters to Nature, Vol. 400, 26 August 1999. Problems with Theory Ultrasonic vibration of the film to produce pressure changes was not found. Film temperature responds fast to cause pressure changes of colliding air molecules? “One might think the ultrasound generation by heat exchange is not possible, as the thermal conduction is too slow. But we report here … an efficient ultrasound emitter” 5 12th Intersociety Conf. Thermal Phenomenon in Electronic Systems ; June 2-5, 2010, Las Vegas

  6. Hypothesis Thermophones by QM produce sound without vibration by emitting EM radiation that is absorbed in the air surroundings QM = Quantum Mechanics EM = Electromagnetic 6 12th Intersociety Conf. Thermal Phenomenon in Electronic Systems ; June 2-5, 2010, Las Vegas

  7. Heat Capacity – Classical v. QM Classical kT 0.0258 eV QM Nanoscale 7 12th Intersociety Conf. Thermal Phenomenon in Electronic Systems ; June 2-5, 2010, Las Vegas

  8. Conservation of EM Energy Recall from QM, QED photons of wavelength  are created by supplying EM energy to a box having sides separated by  / 2. For thin film, l = 2 d nr Conservation proceeds by creating QED photons inside the nanostructure - by frequency up - conversion of absorbed EM energy to the fundamental resonance of the nanostructure. QED = Quantum ElectroDynamics 8 12th Intersociety Conf. Thermal Phenomenon in Electronic Systems ; June 2-5, 2010, Las Vegas

  9. QED Induced Heat Transfer Non Thermal Emission E= Photon Planck Energy dN/dt = Photon Rate T = 0 9 12th Intersociety Conf. Thermal Phenomenon in Electronic Systems ; June 2-5, 2010, Las Vegas

  10. Thermophones as Thin Films* * See T. Prevenslik, “Heat Transfer in Thin Films,” Third Int. Conf. on Quantum, Nano and Micro Technologies, ICQNM 2009, February 1-6, Cancun, 2009: and proceedings of MNHMT09 Micro/Nanoscale Heat and Mass Transfer International Conference, December 18-21, 2009, Shanghai. Classical heat transfer can not explain the reduced conductivity found in thin film experiments. Explanations based on revisions to Fourier theory by phonons as quanta in the BTE are difficult to understand and usually concluded by hand-waving 10 12th Intersociety Conf. Thermal Phenomenon in Electronic Systems ; June 2-5, 2010, Las Vegas

  11. QQED QED Heat TransferQCond = QJoule - QQED ~ 0 KeffT = (QJoule- QQED) (df + dS ) / A T small, Keff ~ Bulk Thin Film – Reduced Conductivity QJoule Effective Conductivity Keff = [Kf / df + KS / dS ] / (df + dS ) Substrate T Current ApproachQCond = QJoule KeffT= Qcond (df + dS )/A T large, Keff small KS Film Kf dS QCond df 11 12th Intersociety Conf. Thermal Phenomenon in Electronic Systems ; June 2-5, 2010, Las Vegas

  12. Thin Film - QED Estimate 12 12th Intersociety Conf. Thermal Phenomenon in Electronic Systems ; June 2-5, 2010, Las Vegas

  13. Thermophones by QM 13 12th Intersociety Conf. Thermal Phenomenon in Electronic Systems ; June 2-5, 2010, Las Vegas

  14. Thermophone – QM Response 14 12th Intersociety Conf. Thermal Phenomenon in Electronic Systems ; June 2-5, 2010, Las Vegas

  15. Thermophone - Conclusions Thermophones produce sound by the absorption of QED emission in the surrounding air. Prompt QED emission allows sound at ultrasonic frequencies to be produced without temperature changes or vibrations. 15 12th Intersociety Conf. Thermal Phenomenon in Electronic Systems ; June 2-5, 2010, Las Vegas

  16. Questions & Papers Email: nanoqed@gmail.com http://www.nanoqed.org 16 12th Intersociety Conf. Thermal Phenomenon in Electronic Systems ; June 2-5, 2010, Las Vegas

More Related