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Unformatted text preview: any triangular passages. Typical is Fig. P6.91, with L 60 cm and an
isoscelestriangle 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  eText Main Menu  P6.92 A large room uses a fan to draw in atmospheric air at 20°C
through a 30cm by 30cm commercialsteel 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 2cmdiameter smooth thin tubes packed tightly
in a hexagonal “bundle” within a single 6cmdiameter
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.
 Spring '08
 Sakar

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