جستجوی مقالات مرتبط با کلیدواژه « مدل تاخیر فاز دوگانه » در نشریات گروه « مکانیک »

The temperature distribution in the laser-irradiated biological tissue is investigated considering heat convection. The first- and the second-degree burn times are predicted using estimation of thermal damage. A non-Fourier equation of bio-heat transfer based on dual phase lag model is employed. The transport behavior of laser light in the tissue is regarded as highly absorbed and effects of the phase lag times on thermal response and thermal damage are explored considering different heat convection coefficients. The Laplace transform with discretization technique and also using boundary conditions, a set of algebraic equations in Laplace domain is generated which are solved by numerical Laplace inverse transform. The results show that the highly absorbed laser light in the tissue plays an important role in the burned skin time. Also, convective heat transfer boundary condition on the surface provides different results, even by considering the natural convection on the surface, and the first- and the second-degree burns are postponed at least 0.02 second.

In recent years, various studies about non-Fourier heat transfer in various media including porous media have been performed that have provided ýcontradictory results. In this article, the non-Fourier heat transfer in the porous media, especially the sand has been examined. In this regard, the ýnumerical solution of a non-Fourier thermal conductivity with a pulsed heat flow boundary condition has been studied and this condition for the non-ýFourier models has been discretized and applied in the non-Fourier manner. In this way, first, the governing equation for the DPL model has been ýsolved with an explicit finite difference numerical method and its results have been studied and compared with the experimental data [1]. However, in ýthe process of numerical solution of the DPL model, the grid study has been performed before anything. Also, the Single-Phased Lagging (SPL) ýmodel has been solved with an explicit numerical method and its results have been compared with the results of the DPL model and the experimental ýdata. In this article, like the reference [1], it has been shown that the DPL model can model the non-Fourier heat transfer so much better that the ýCattaneo’s model. ý