Chapter 4 Transient Heat Conduction4-78A rectangular ice block is placed on a table. The time the ice block starts melting is to be determined. Assumptions1Heat conduction in the ice block is two-dimensional, and thus the temperature varies in both x- and y- directions. 2The thermal properties of the ice block are constant. 3The heat transfer coefficient is constant and uniform over the entire surface. 4 The Fourier number is τ> 0.2 so that the one-term approximate solutions (or the transient temperature charts) are applicable (this assumption will be verified). PropertiesThe thermal properties of the ice are given to be k = 2.22 W/m.°C and α= 0.124×10-7m2/s. Analysis This rectangular ice block can be treated as a short rectangular block that can physically be formed by the intersection of two infinite plane wall of thickness 2L= 4 cm and an infinite plane wall of thickness 2L= 10 cm. We measure xfrom the bottom surface of the block since this surface represents the adiabatic center surface
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This note was uploaded on 01/19/2012 for the course PHY 4803 taught by Professor Dr.danielarenas during the Fall '10 term at UNF.