A small device is used to measure the surface temperature of an object. A thermocouple bead of
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A small device is used to measure the surface temperature of an object. A thermocouple bead of diameter D = 120μm is positioned a distance z = 100m from the surface of interest. The two thermocouple wires, each of diameter d = 25 μm and length L = 300 μm, are held by a large manipulator that is at a temperature of Tm = 23C.
If the thermocouple registers a temperature of Ttc = 29C, what is the surface temperature? The thermal conductivities of the chromel and alumel thermocouple wires are kCh =19 W/m · K and kAl = 29 W/m· K, respectively. You may neglect radiation and convection effects.
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Related Book For 
Fundamentals Of Heat And Mass Transfer
ISBN: 9780470501979
7th Edition
Authors: Theodore L. Bergman, Adrienne S. Lavine, Frank P. Incropera, David P. DeWitt
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