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# Georgia Tech - CHE 3200 - Class Notes - Week 9

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Georgia Tech - CHE 3200 - Class Notes - Week 9

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Unformatted text preview: Tues Oct 16 Turbulentus. Lamitar Flow Laminar : Friction Facito (f ) depends on Re suly! F ree Fully Turbulent: Friction Factor () depends on roughness only! Turbulent. f depends on both Red roughness see Moody Plots 40. (2.29 -4.169.14.67 heil 1* plot (Re%) find els through setend plet water e DF fos tirough 6" cash-irom pipe Vove: 4 f?s L:12L ft what is h? fidelp = 0.0019 calculate Re >> VAD Y 14000 (twibrules !) & fine fp => plot: 0.006 Ex2 commercial steel pipe Water @ 4.4 C flows through 305 Desired flow roke : Q:946XICAS ( 15e gelmia Available nood of water: Cin (puary of grovity) what site should the pipe ke? look up: Potin 1,55X10 Pais 4.bxem velocity velocity vs vs . 0.0120M mys DE - dimem Siesales's roughness : : 4. lexikon s head iussite: 2 seg 12-01204 anys) 5 = 6.1 mm DS-1,474 * *m forProblem: both and ff unknown! .buess value for D velocity #ins (reasonable creer of magnitude) R: 2.01 temas Ollo Re: le 7.1210", 0.00042 Moodly Plat :ff: 0,0653 Substitute ff 0.0053 in haequation D: 0.6949 ) V=1,334 mis Re: \$.2*10* 0.00045 Substitute f o.10525 in hiem > Mondy Plet: 10.06-525 => 2:0,0947 very clese (within 1%) 0:0.0943m-9,5cm Faction friction comes from more than just pipes! exponical contraction ??, headloss due to fitings: hak. of he: 2free , where Lede is the equivalent pipe length withe same friction less k. Ley listed is toble 14.1 in 2 tebe 2.10. in handout IntitetEhe Contraction / opws Valves wi :0.55(1-3ye Mes ene= (1-7) always based on the higher velocity * . Special cases: A, -Ag - Kcenk o 4,7A (tarkide) => cod 0.55 ; 4.>>A (pipe lank) kemp !For non circular conduits sill-defined but... ... We can define the equivalent diameter Du Hat allows us to use our equations for Re, het Den 4. eross-sectional area of flow wetted perimeter Examples: Retangular pipe Zana parce and to Rectangular channel filed up to level H aZH Lencentrie pipes to (10) D.D. :D... Circular pipe ID Dee - 4 - Ov Why is head loss useful? in terms of poescure drop (or it describes viscous loss of energy rather the equivalent tuss et poiestiel energy ghi - Macroscopic energy bulcince: secara se te stel 192-4-ai dhe i fus e(t +9zru]av Beribert, Pet no accumulation steadly stabel Zout, Aart Min, via, Pin 1:0 (frictional loss in ut Zn An L = e inen Stange of p[4.97*k . ] 18.-1)dA - -Hinwindink en gooi ouim "Parthen there in the gemeente Mass balance. Pro Vin Aim - Poud Vort Aout sa > Men Shoes in fuae in s glad-zin) offerte Pac) + (Heve - Hin] - We can incorperate viscous tosses in the energy balance by using the comcept of head loss ! Pout

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