Question: A very long, rectangular cross-section block is made from metal with the following properties: thermal 8719K W g conductivity = 139 K, density =

A very long, rectangular cross-section block is made from metal with the

A very long, rectangular cross-section block is made from metal with the following properties: thermal 8719K W g conductivity = 139 K, density = 2907k3, and specific heat capacity = 871 gk. Initially sides of m m the cross section are maintained at 373K. Then the temperature of one side is suddenly increased to 473K. The temperature profile in the block will be investigated using an explicit finite di model. If the time step is fixed at 5.9 seconds, what is the limit for node spacing that should be used to ensure stability of the solution? Give your numerical answer in mm to 1 decimal place.

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