The Dual Reciprocity Boundary Element Method (DRBEM) is extended to simulatethe thermal wave propagation in biological tissues. The higher the thermal relaxation timeis, the stronger the thermal wave effect will be. U...The Dual Reciprocity Boundary Element Method (DRBEM) is extended to simulatethe thermal wave propagation in biological tissues. The higher the thermal relaxation timeis, the stronger the thermal wave effect will be. Under changing heat source, bioheat trans-fer has distinct wave characters. The thermal wave propagation in biological tissues obeysthe superposition and resolution principle of ordinary wave. Reflected by a rigid wall’ (thefirst boundary condition), the thermal wave will show a phase jumping phenomenon. TheDRBEM is an efficiellt pure boundary iotegral method without domain integral for solvingthermal wave problems. Thermal wave and their refiection, phase jumping, superposition,resolution can be correctly located and sharply captured. There are no the oscillatory behav-ior in the wave front and wave peak region, which is presented in reported finite differencesolution with TVD high accuracy scheme.展开更多
In this paper, a new model to analyze laminar forced convective enhanced heat transfer in latent function-ally thermal fluid is developed. The main characteristics of the model are: i) a new formula of the specific he...In this paper, a new model to analyze laminar forced convective enhanced heat transfer in latent function-ally thermal fluid is developed. The main characteristics of the model are: i) a new formula of the specific heat at con-stant pressure is used; ⅱ) a real heat transfer process is considered; that is, heat transfer processes occur not only between working fluid and microcapsules, but also between the mixture and tube wall; ⅲ) the new method, which com-bines the newly developed axisymmetrical dual reciprocity boundary element method (DRBEM) with finite difference method (FDM), is used to solve the control equations of this problem. The new model is validated by experimental data. Some new physical results on the variational characteristics of the specific heat at constant pressure with space and time during phase-change process, the time-marching history of the phase-change interfaces and so on are obtained. Several main physical factors that affect enhanced heat transfer in latent functionally thermal fluid are numerically analyzed. Some new understandings for the mechanism of enhanced heat transfer in the functionally fluid are obtained.展开更多
Through simulating one-and two-dimensional non-Fourier heat conduction problems under different pulsed inlet conditions, this paper numerically predicts some different non-Fourier heat conduction characters arose from...Through simulating one-and two-dimensional non-Fourier heat conduction problems under different pulsed inlet conditions, this paper numerically predicts some different non-Fourier heat conduction characters arose from different pulse types and different pulse frequencies. Meanwhile, the differences among thermal wave, non-Fourier and Fourier heat conduction are also showed.展开更多
文摘The Dual Reciprocity Boundary Element Method (DRBEM) is extended to simulatethe thermal wave propagation in biological tissues. The higher the thermal relaxation timeis, the stronger the thermal wave effect will be. Under changing heat source, bioheat trans-fer has distinct wave characters. The thermal wave propagation in biological tissues obeysthe superposition and resolution principle of ordinary wave. Reflected by a rigid wall’ (thefirst boundary condition), the thermal wave will show a phase jumping phenomenon. TheDRBEM is an efficiellt pure boundary iotegral method without domain integral for solvingthermal wave problems. Thermal wave and their refiection, phase jumping, superposition,resolution can be correctly located and sharply captured. There are no the oscillatory behav-ior in the wave front and wave peak region, which is presented in reported finite differencesolution with TVD high accuracy scheme.
文摘In this paper, a new model to analyze laminar forced convective enhanced heat transfer in latent function-ally thermal fluid is developed. The main characteristics of the model are: i) a new formula of the specific heat at con-stant pressure is used; ⅱ) a real heat transfer process is considered; that is, heat transfer processes occur not only between working fluid and microcapsules, but also between the mixture and tube wall; ⅲ) the new method, which com-bines the newly developed axisymmetrical dual reciprocity boundary element method (DRBEM) with finite difference method (FDM), is used to solve the control equations of this problem. The new model is validated by experimental data. Some new physical results on the variational characteristics of the specific heat at constant pressure with space and time during phase-change process, the time-marching history of the phase-change interfaces and so on are obtained. Several main physical factors that affect enhanced heat transfer in latent functionally thermal fluid are numerically analyzed. Some new understandings for the mechanism of enhanced heat transfer in the functionally fluid are obtained.
文摘Through simulating one-and two-dimensional non-Fourier heat conduction problems under different pulsed inlet conditions, this paper numerically predicts some different non-Fourier heat conduction characters arose from different pulse types and different pulse frequencies. Meanwhile, the differences among thermal wave, non-Fourier and Fourier heat conduction are also showed.
