Chapter 4 Transient Heat Conduction4-14 The temperature of a gas stream is to be measured by a thermocouple. The time it takes to register 99 percent of the initial ΔTis to be determined. Assumptions1The junction is spherical in shape with a diameter of D= 0.0012 m. 2 The thermal properties of the junction are constant.3The heat transfer coefficient is constant and uniform over the entire surface. 4 Radiation effects are negligible. 5 The Biot number is Bi < 0.1 so that the lumped system analysis is applicable (this assumption will be verified). PropertiesThe properties of the junction are given to be k=°35 W / m.C, , and . ρ=8500 kg / m3Cp=°320 J / kg. CAnalysisThe characteristic length of the junction and the Biot number are
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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.