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Conservation laws and associated Lie point symmetries admitted by the transient heat conduction problem for heat transfer in straight fins

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Ndlovu P. , Moitsheki R.

Open Physics

2013

tom 11

nr 8

984-994

Some new conservation laws for the transient heat conduction problem for heat transfer in a straight fin are constructed. The thermal conductivity is given by a power law in one case and by a linear function of temperature in the other. Conservation laws are derived using the direct method when thermal conductivity is given by the power law and the multiplier method when thermal conductivity is given as a linear function of temperature. The heat transfer coefficient is assumed to be given by the power law function of temperature. Furthermore, we determine the Lie point symmetries associated with the conserved vectors for the model with power law thermal conductivity.