Air at 35𝑜𝐶,1𝑎𝑡𝑚35oC,1atm (𝜌=1.145𝑘𝑔/𝑚3,&#120583

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Air
at 35𝑜𝐶,1𝑎𝑡𝑚35oC,1atm (𝜌=1.145𝑘𝑔/𝑚3,𝜇=1.895×10−5𝑘𝑔/𝑚.𝑠)(ρ=1.145kg/m3,μ=1.895×10−5kg/m.s),
enters a 23-m-long section of a rectangular duct of cross section
0.18 𝑚×m× 0.31 𝑚(ℎ×𝑤)m(h×w) made of steel at an
average velocity of 9.5 𝑚/𝑠m/s. Disregards the entrance
effect, determine the pressure loss in this section of the
duct.
Given that the absolute roughness of steel
is 𝜀=ε= 4.2E-5 𝑚m.