Loading...

Investigation of Non-fourier Heat Transfer Model During Laser Irradiation in Teeth

Zera'at Pisheh, Milad | 2018

658 Viewed
  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 50886 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Nuri Boroujerdi, Ali; Arjmand, Navid
  7. Abstract:
  8. In the present study, the thermal behavior of human teeth during laser radiation has been discussed. The high laser power, as well as its low emission, can allow deviations from the Fourier heat transfer model. To overcome this problem, the non- Fourier heat transfer method, dual phase lagged (DPL), has been used. Wisdom considered in this study to evaluate the thermal behavior of tooth. Using the finite volume method, the DPL equations are solved and the thermal response of the teeth is obtained during laser irradiation. The effect of delay times, which are the parameters of the DPL model and depart from the Fourier model, is fully demonstrated on the temperature behavior of the tooth, and it is shown that the non-Fourier heat transfer model can provide a completely different temperature distribution than the Fourier heat transfer model, which is the amount of this deviation is determined according to the two delay times of the DPL model. In order to determine the optimum latency, inverse heat transfer methods have been used. Optimum delay times have been obtained using the Levenberg-Marquardt method and experimental data from previous studies, and it has been determined that the non-Fourier model is better than the Fourier model during laser irradiation in the teeth. For example, by assuming a radius of 2800 J/m2 of laser (for a period of 5 seconds), the Fourier equation for the tooth surface shows a maximum temperature difference of about 40 degrees Celsius, while the experimental results report this difference at about 22 degrees Celsius. If the teeth are considered as a non-Fourier material with coefficients τ_q= 3 & τ_T = 3, the maximum temperature difference is about 25 ° C, which is much closer to the experimental results
  9. Keywords:
  10. Finite Volume Method ; Laser Radiation ; Non-Fourier Heat Conduction ; Teeth ; Human Teeth

 Digital Object List

 Bookmark

No TOC