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snow_tiger [21]
3 years ago
10

Plane wall of material A with internal heat generation is insulated on one side and bounded by a second wall of material B, whic

h is without heat generation and is subjected to convection cooling. Find the inner (To) and outer surface (T1 and T2) temperatures of the composite.
Engineering
1 answer:
viktelen [127]3 years ago
8 0

Sorry❤

Have a nice day ✨

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Water at atmospheric pressure boils on the surface of a large horizontal copper tube. The heat flux is 90% of the critical value
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Answer:

The tube surface temperature immediately after installation is 120.4°C and after prolonged service is 110.8°C

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q=0.149h_{fg} \rho _{v} (\frac{\sigma (\rho _{L}-\rho _{v})}{\rho _{v}^{2} }  )^{1/4} =0.149*2257*0.596*(\frac{58.9x10^{-3}*(957.9-0.596) }{0.596^{2} } )^{1/4} =18703.42W/m^{2}

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Cfg = 0.0128

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qn = 0.9 * 18703.42 = 16833.078 W/m²

q_{n} =uK(\frac{g(\rho_{L}-\rho _{v})     }{\sigma })^{1/2} (\frac{c_{pL}*deltaT }{c_{fg}h_{fg}Pr  } \\16833.078=279x10^{-6} *2257x10^{3} (\frac{9.8*(957.9-0.596)}{0.596} )^{1/2} *(\frac{4.127x10^{3}*delta-T }{0.0128*2257x10^{3}*1.76 } )^{3} \\delta-T=20.4

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Tinst = 100 + 20.4 = 120.4°C

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ΔT = 10.8°C

The tube surface temperature after prolonged service is:

Tprolo = 100 + 10.8 = 110.8°C

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