Derive Equation 5 and assuming probe diameter to be 0.032 inches, use this equation and Table 1 to calculate the heat transfer coefficients for the thermocouples and compare your results with the expected value.
Assuming that the thermocouple measurement junction can be modeled by a sphere:
τ = (ρdc) / (6h)
Derive Equation 5 and assuming probe diameter to be 0.032 inches, use this equation and Table 1 to calculate the heat transfer coefficients for the thermocouples and compare your results with the expected value.
Table 1: Selected Properties of Thermocouple Metals
Material
Density Kg/m^2 8,600 8,920
Specific Heat J/kg-K 526 395
Alumel Constantan Chromel Copper Iron Platinum
8,730 8,930 7,870 21,450
450 385 447 134
