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Unformatted text preview: (a) Total Power Paddle velocity for Inner board = x 2 x 4 x 1/60 = 0.419 m/s Paddle velocity for outer board = x 3 x 4 x 1/60 = 0.628 m/s Power for each paddle Paddle tip speed (V p ) = 0.75 x paddle velocity Coefficient of drag (Cd) = 1.8 for flat blade Density of water ( ) = 998.2 kg/m 3 Viscosity, = 1.002 x103 N.s/m 2 P = (C d A p V p 3 )/2 Power, P1 for inner board = [1.8 x (0.1 x3 x 4) x 998.2 x (0.75 x 0.419) 3 ]/2 = 33.46 watt Power, P2 for inner board = [1.8 x (0.1 x3 x 4) x 998.2 x (0.75 x 0.628) 3 ]/2 = 112.64 watt Total power P = P1 + P2 = 33.46 + 112.64 = 146.1 watt (b) Gt Retention Time, t = V/Q = 4x4x4/5000 = 0.0128 days = 1106 sec G = [P/(Vx )] 1/2 = [146.1/(4x4x4x1.002x103 )] 1/2 = 47.75 s1 Therefore, Gt = 1106 x 47.75 = 52811.5...
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This note was uploaded on 09/13/2011 for the course CIVL 242 taught by Professor Gh during the Fall '09 term at HKUST.
 Fall '09
 GH

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