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Lecture 5

# Lecture 5 - Lecture 5 Dr Srinath V Ekkad Two-Dimensional...

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Lecture 5 Dr. Srinath V. Ekkad

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Two-Dimensional Steady-State Conduction One coordinate direction conduction is grossly oversimplified and most times, it is very important to consider multi-dimensional effects. Heat flow lines Isotherms Hot surface Cold surface Cold surface Cold surface

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Shape Factors Q = S k T Where T = T1 – T2 = Temperature difference & S = Shape factor Conduction shape factors for selected two-dimensional systems SYSTEM SCHEMATIC RESTRICTION S SHAPE FACTOR Isothermal sphere burried in a semiinfinite medium z T 2 T 1 D z > D/2 2 1 4 π D D z - / Horizontal isothermal cylinder of length L buried in a semiinfinite medium L D T 2 T 1 z L » D L » D z > 3D/2 ( 29 ( 29 2 2 2 1 4 1 π
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