E10 Group Assignment3

# E10 Group Assignment3 - spaceship Thus we use the earth...

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# 3 Assume the water in the pipe is at 20 C, as it usually is in the pipes on the Earth. ̊ At this temperature, the density is = . . ρ 998 2kgm3 The dynamic viscosity is = . × - . μ 1 003 10 3Nsm2 In order to find the friction factor from the Moody diagram, we first calculate the Reynolds number. = = . × . × . × - . × - Re ρvDμ 998 2kgm3 0 550ms 2 54 10 2m1 003 10 = . × . 3Nsm2 1 39 104 For the concrete pipe, the equivalent roughness is = . ϵ 0 3 = × - . = × - . × - = . . mm 3 10 4m ϵD 3 10 4m 2 54 10 2m 0 012 According to the Moody diagram, the friction factor is = . . f 0 045 For the convenience and safety of the people, we create earth gravity in our
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Unformatted text preview: spaceship. Thus we use the earth gravity in calculations. Therefore, the head loss is = = . × × . × . × . ×-= . ∆h fLv22gD 0 045 100m 0 550ms22 9 8m2s 2 54 10 2m 2 73 . meters of water The pumping head is also 2.73 meters of water. = = . × . / × . = . × . ∆p ρg∆h 998 2kgm3 9 8 m2 s 2 73m 2 68 104Pa Therefore the power of the pumping head is =( × )/( %)= P Q ∆p 75 9.93W. This much power is similar to the power of a household lamp, which usually varies from 5W to 40W....
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