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The non-steady-state temperature distribution in a thin metal bar is described by the following partial differential equation:

ρ Cp ∂T/∂T =K ∂2T/∂X2

where ρ is the material density, Cp its heat capacity, and k its thermal conductivity.

A 6 cm long aluminum bar initiatly has a temperature distribution as follows:

T(x,0)=O°C for O cm ≤x ≤ 6cm

The sides of the bar are insulated and the two ends are subject to the following boundary conditions:

T(x,t)=20°C           at x = 0 cm for t> 0

qx= 540 kW m-2      at x = 6cmfor t>0

Use a numerical technique to estimate the temperature distribution in the bar at the following times: 0.5 sec, 1 sec, and 1.5 sec. You must use a simple explicit technique with a spatial discretization Δx = 1 cm and a time increment Δt = 0.25 sec. Check that the method will be convergent and stable for these spatial and temporal increments.

Using a sketch indicate how you think the temperature distribution will change with time. What is the final steady state temperature distribution in the aluminium bar?

For aluminium: k = 0.27 kW m-1 K-l

ρ= 3000 kg m-3

Cp = 0.9 kJ kg-1k-1

Chemical Engineering, Engineering

  • Category:- Chemical Engineering
  • Reference No.:- M91892

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