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san4es73 [151]
3 years ago
13

(20pts) A thermocouple junction, which may be approximated as sphere, is to be used for temperature measurement in a gas stream.

The convection coefficient between the junction surface and the gas is h = 400 W/m2·K and the junction thermophysical properties are k = 20 W/m·K, c = 400 J/kg·K and rho = 8500 kg/m3. Determine the junction diameter needed for the thermocouple to have a time constant of 2 s. If the junction is at 25 °C and is placed in a gas stream that is at 200 °C, estimate the temperature of the junction after 10 minutes.

Engineering
1 answer:
Vladimir79 [104]3 years ago
7 0

Answer:

The solution is given in the attachments.

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A cylindrical specimen of some metal alloy having an elastic modulus of 106 GPa and an original cross-sectional diameter of 3.9
kiruha [24]

Answer:

L= 312.75 mm

Explanation:

given data

elastic modulus E = 106 GPa

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solution

we will apply here allowable elongation equation that is express as

ΔL =     \dfrac{FL}{AE}     ....................1

put here value and we get L

L   =    \dfrac{0.41\times 10^{-3}\times \dfrac{\pi}{4}\times (3.9\times 10^{-3})^2\times 106\times 10^9}{1660}

solve it we get

L = 0.312752 m

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Read 2 more answers
Precast double-tee units are generally used as structural floors when:________.
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Answer:

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<em></em>

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