Chapt06

For the system of fig p655 let z 80 m and l 185 m of

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Unformatted text preview: any triangular passages. Typical is Fig. P6.91, with L 60 cm and an isosceles-triangle cross section of side length a 2 cm and included angle 80°. If the average velocity is V 2 m/s and the fluid is SAE 10 oil at 20°C, estimate the pressure drop. a β L V P6.91 | v v 412 | e-Text Main Menu | P6.92 A large room uses a fan to draw in atmospheric air at 20°C through a 30-cm by 30-cm commercial-steel duct 12 m long, as in Fig. P6.92. Estimate (a) the air flow rate in m3/h if the room pressure is 10 Pa vacuum and (b) the room pressure if the flow rate is 1200 m3/h. Neglect minor losses. 30 cm by 30 cm Fan Room patm 12 m P6.92 P6.93 Modify Prob. 6.91 so that the angle is unknown. For SAE 10 oil at 20°C, if the pressure drop is 120 kPa and the flow rate is 4 m3/h, what is the proper value of the angle , in degrees? P6.94 As shown in Fig. P6.94, a multiduct cross section consists of seven 2-cm-diameter smooth thin tubes packed tightly in a hexagonal “bundle” within a single 6-cm-diameter tube. Air, at about 20°C and 1 atm, flows through this...
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This note was uploaded on 10/27/2009 for the course MAE 101a taught by Professor Sakar during the Spring '08 term at UCSD.

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