ch67 - Allows calculations of capacity of an oil pipe line,...

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Unformatted text preview: Allows calculations of capacity of an oil pipe line, what diameter water main to install or pressure drop in an air duct, V 1avg 2 / (2g) + p 1 /( g) + z 1 = V 2avg 2 / (2g) + p 2 /( g) + z 2 + h lT Bernoullis Equation one of the most important and useful equations in fluid mechanics Fox et al. h lT has units of enery per unit weight which equals length + V 1avg 2 / (2g) + p 1 /( g) + z 1 = V 2avg 2 / (2g) + p 2 /( g) + z 2 + h lT V = Q/Area Does not include losses due to entrance, pipe fittings, expansion, exit, V 1avg 2 /2 + p 1 / + gz 1- V 2avg 2 /2 - p 2 / - gz 2 = f [L/D][V 2 /2] + f [L e /D][V 2 /2] + K[V 2 /2] p 1 /( g) - p 2 /( g) = f [L/D][V avg 2 /(2 g)] + h lm pipe minor losses: entrance, exit, valves, Only losses in fully developed laminar and turbulent pipe flow ; does not include entrance, exit, expansions, contraction, elbow, bends, valves, other pipe fittings . Pipe Flow Examples ~ Solving for pressure drop in horizontal pipe Air flows through 4.0 mm diameter drawn tubing ( = 0.0015 mm) at V = 50 m/s. Calculate p per 0.1 m if flow is laminar ? Assume fully developed and can use Moody Diagram: Re = VD/ = 13,700 - normally turbulent (> 2300) However, if good entrance, no dust, no vibrations, could be laminar Laminar: f = p (D/L) / [...
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This note was uploaded on 04/26/2010 for the course MAE 101B 101B taught by Professor Rohr during the Summer '09 term at UCSD.

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ch67 - Allows calculations of capacity of an oil pipe line,...

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