By Glenn R. Fulford, Philip Broadbridge

The point of interest during this textual content is on mathematical modelling influenced through modern commercial difficulties related to warmth conduction and mass diffusion. those contain non-stop steel casting, laser drilling, spontaneous combustion of commercial waste, water filtration and crop irrigation. the economic difficulties end up to be a very good environment for the advent and reinforcement of modelling talents, equation fixing strategies, qualitative realizing of partial differential equations and their dynamical homes. Mathematical subject matters comprise establishing partial differential equations and boundary stipulations, dimensional research, scaling, perturbation expansions, boundary valuer difficulties, Fourier sequence, symmetry mark downs, Stefan difficulties and bifurcations.

**Read Online or Download Industrial Mathematics: Case Studies in the Diffusion of Heat and Matter (Australian Mathematical Society Lecture Series) PDF**

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**Additional info for Industrial Mathematics: Case Studies in the Diffusion of Heat and Matter (Australian Mathematical Society Lecture Series)**

**Sample text**

If a material were non-isotropic then (9) would need to be generalised to a linear combination of the partial derivatives of the temperature. By assuming conservation of heat energy for an arbitrary region, and using the divergence theorem, it is possible to derive the 3-D heat equation (details are left to the exercises, see Question 8 for the mass diffusion case) ∂u + ∇ · J = 0. (10) ρc ∂t Substituting Fourier’s law (9) into the transport equation (10) we obtain ρc ∂u = k∇2 u ∂t where ∇2 = ∂2 ∂2 ∂2 + 2 + 2.

B) Suppose that V is a function of time t. What should the transformation be in this case in order to get the same equation? 19. The equations describing a convection-diffusion problem in heat transport are ∂u ∂u ∂2u +v = α 2, ∂t ∂x ∂x u(0, t) = u0 , u(x, 0) = 0, u( , t) = u1 , where u(x, t) is the temperature, v is the (constant) velocity and α is the thermal diffusivity. Consider the following scaling, X= x , T = αt 2 , U= u , u1 V = v . α Show that the above equations may be expressed in the dimensionless form ∂U + ∂T 1 ∂U ∂2U , = ∂X ∂X 2 U (0, T ) = 2 U (X, 0) = 0, giving formulae for the dimensionless constants 1 and 2.

Number of boundary and initial conditions The classical heat-diffusion equation for heat flow in a rod is ∂2u ∂u (1) =α 2 ∂t ∂x which is a second-order partial differential equation in space and a firstorder partial differential equation in time. g. an initial distribution of temperature) and two boundary conditions — one at each end of the rod. For the three-dimensional heat equation ∂u = α∇2 u ∂t 22 Preliminaries we require an initial condition plus data specified on the boundary of the domain of the problem.