New PDF release: Laser Heating Applications

By Bekir Yilbas

ISBN-10: 0124157823

ISBN-13: 9780124157828

Thermal remedy of fabrics occupies an important, expanding share of MSE job and is an quintessential portion of sleek curricula in addition to a hugely monetized component to commercial construction. Laser processing of fabrics bargains merits over traditional tools of processing. a few of these benefits contain speedy processing, precision of operation, cost-efficient and native remedy. Analytical modeling of laser processing supplies perception into the actual and mathematical features of the matter and gives valuable details on method optimization. This paintings from Professor Yilbas, a world-recognized specialist in laser fabrics processing, presents the mandatory intensity and weight of research, collating mathematical and actual modeling and experimentation with the required dialogue of functions. It meets coherence in themes with excessive technical caliber. It encompasses the fundamentals of laser processing and gives an creation to analytical modeling of the method. basics and formula of the heating method are provided for varied heating conditions.

  • Detailed analytical ideas for laser heating difficulties (including thermal rigidity) aids research of linkage among method parameters, reminiscent of laser pulse and laser depth, and fabric reaction, resembling temperature and stress
  • Encompasses sensible options to thermal heating difficulties (unlike the size recommendations of numerical schemes)
  • Extensive fourier and non-fourier remedies and consequent research offers superior realizing of mathematical transformations

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Extra resources for Laser Heating Applications

Example text

5 ms. In this case, DT is considerably small while the surface temperature results in an almost constant trend with the heating time. 16 shows the temporal behavior of the total entropy generation number during the heating and cooling cycles of the pulse. The entropy generation number increases rapidly in the initial part of the heating process and remains almost the same as the heating progresses. The attainment of the low entropy generation number in the pulse beginning may be explained in terms of the energy absorption process.

This is because the last two exponential terms of the solution are of the form exp(Àbx) À exp(gx) where b < g. It can be shown that this function initially rises to a maximum before decaying away toward zero [2]. 17) a k vx a a kd a The condition for a maximum temperature is vT ¼ 0: vx 58 Laser Heating Applications Hence,    ! V Vx I0 Vx I0 Ts exp À þ exp À ¼ expðÀdxÞ kd k a a a or  ! 19) However, V << d a Therefore, the location of the maximum temperature is ! 15), dxmax ! 21) ! 22) In laser drilling, a drilling efficiency h can be defined as the ratio of the power removed by the evaporation material to the incident beam intensity, thus a relationship may be obtained between h and the reduced temperature Tr ðTr ¼ TTsc , Tc being the critical temperature).

The pulse shapes and the temperature distributions used in the present calculations are obtained from a previous study [9]. 4. RESULTS AND DISCUSSION The case studies are introduced in relation to each closed-form solution presented for the heating analysis. 1. 1. 6 shows the temporal variation of dimensionless surface temperature at different locations inside the substrate material. The temperature increases steadily with increasing heating time, which is more pronounced at the surface. This is associated with the laser-pulse intensity, which is significantly higher at the surface as compared to some depths below the surface.

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Laser Heating Applications by Bekir Yilbas

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