Thermodynamics HW Solutions 425

Thermodynamics HW Solutions 425 - Chapter 5 Numerical...

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Chapter 5 Numerical Methods in Heat Conduction 5-35 One side of a hot vertical plate is to be cooled by attaching aluminum fins of rectangular profile. The finite difference formulation of the problem for all nodes is to be obtained, and the nodal temperatures, the rate of heat transfer from a single fin and from the entire surface of the plate are to be determined. Assumptions 1 Heat transfer along the fin is given to be steady and one-dimensional. 2 The thermal conductivity is constant. 3 Combined convection and radiation heat transfer coefficient is constant and uniform. Properties The thermal conductivity is given to be k = 237 W/m °C. Analysis ( a ) The nodal spacing is given to be Δ x =0.5 cm. Then the number of nodes M becomes 5 1 cm 5 . 0 cm 2 1 = + = + Δ = x L M The base temperature at node 0 is given to be T 0 = 130 ° C. This problem involves 4 unknown nodal temperatures, and thus we need to have 4 equations to determine them uniquely. Nodes 1, 2, and 3 are interior nodes, and thus for them we can use the general finite difference relation expressed as
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This note was uploaded on 01/22/2012 for the course PHY 4803 taught by Professor Dr.danielarenas during the Fall '10 term at UNF.

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