Chapter 1 Basics of Heat Transfer1-69 The thermal conductivity of a material is to be determined by ensuring one-dimensional heat conduction, and by measuring temperatures when steady operating conditions are reached. Assumptions 1Steady operating conditions exist since the temperature readings do not change with time. 2 Heat losses through the lateral surfaces of the apparatus are negligible since those surfaces are well-insulated, and thus the entire heat generated by the heater is conducted through the samples.3 The apparatus possesses thermal symmetry. AnalysisFor each sample we have &/(...QAT===−=°28 2140100182748Wm)(m)mC2ΔThen the thermal conductivity of the material becomes &&(( .)(8)QkATLkQLAT=⎯→⎯==°=°Δ
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This note was uploaded on 01/14/2012 for the course PHY 4803 taught by Professor Dr.danielarenas during the Fall '10 term at UNF.