Applied Fluid Mechanics (7th Edition)
7th Edition
ISBN: 9780132558921
Author: Robert L. Mott, Joseph A. Untener
Publisher: PEARSON
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Chapter 19, Problem 19.24PP
A section of duct system consists of
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An air-conditioning system is designed to have a ductwith a rectangular cross section 1 ft by 2 ft, as shown. Duringconstruction, a truck driver backed into the duct and made it atrapezoidal section, as shown. The contractor, behind schedule,installed it anyway. For the same pressure drop along the pipe,what will be the ratio of the velocity in the trapezoidal duct tothat in the rectangular duct? Assume the Darcy-Weisbach resistance coefficient is the same for both ducts.
The pipe bend of Fig. has D 1 = 27 cm and D 2 =13 cm. When water at 20 ° C fl ows through the pipe at 4000gal/min, p 1 =194 kPa (gage). Compute the torque requiredat point B to hold the bend stationary.
A two branch duct system of circular duct is shown below. The fittings have the following equivalent lengthof straight duct upstream to branch 4m elbow 2m. There is negligible pressure loss in the straight throughsection of the branch. The designer slects 4pa/m as the pressure gradient in all sections. What diameter in ft should be selected in the 5m section?
A. 0.54
B. 0.34
C. 1.12
D. 0.44
Chapter 19 Solutions
Applied Fluid Mechanics (7th Edition)
Ch. 19 - Determine the velocity of flow and the friction...Ch. 19 - Repeat Problem 19.1 O for duct diameters of 16,...Ch. 19 - Prob. 19.3PPCh. 19 - Determine the velocity of flow and the friction...Ch. 19 - Repeat Problem 19.40 for duct diameters of...Ch. 19 - Prob. 19.6PPCh. 19 - Prob. 19.7PPCh. 19 - '19.8 A branch duct for a heating system measures...Ch. 19 - Prob. 19.9PPCh. 19 - Prob. 19.10PP
Ch. 19 - A branch duct for a heating system measures 75250...Ch. 19 - Prob. 19.12PPCh. 19 - Prob. 19.13PPCh. 19 - Prob. 19.14PPCh. 19 - Repeat Problem 19.14, but use a five-piece elbowCh. 19 - Prob. 19.16PPCh. 19 - Prob. 19.17PPCh. 19 - Prob. 19.18PPCh. 19 - Prob. 19.19PPCh. 19 - Prob. 19.20PPCh. 19 - Compute the pressure drop as 0.20m3/s of air flows...Ch. 19 - Prob. 19.22PPCh. 19 - Compute the pressure drop as 0.85m3/s of air flows...Ch. 19 - A section of duct system consists of 42 ft of...Ch. 19 - A section of duct system consists of 38 ft of...Ch. 19 - The intake duct to a fan consists of intake...Ch. 19 - Forthe conditions shown in figs. 19.719- 19.10 0,...Ch. 19 - Forthe conditions shown in figs. 19.719- 19.10 0,...Ch. 19 - Prob. 19.29PPCh. 19 - Forthe conditions shown in figs. 19.719- 19.10 0,...
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- The tank–pipe system of Fig. is to deliver at least11 m3/h of water at 20°C to the reservoir. What is themaximum roughness height ε allowable for the pipe?arrow_forwardAn old commercial pipe, horizontal, 36′′ inside diameter and 8000 ft long, carries 44.2 cfs of heavy fuel oil with a lost head of 73.5 ft. What pressure in psi must be maintained at A upstream to keep the pressure at B at 20 psi? Use e = 0.045 ft. Please show the FREE BODY DIAGRAM of the problem.arrow_forwardConsider a 20°C fl ow at 2 m/s through a smooth 3-mmdiameter microtube which consists of a straight run of10 cm, a long radius bend, and another straight run of10 cm. Compute the total pressure drop if the fl uid is(a) water; and (b) ethylene glycol.arrow_forward
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- A two branch duct system of circular duct is shown below. The fittings have the following equivalent lengthof straight duct upstream to branch 4m elbow 2m. There is negligible pressure loss in the straight throughsection of the branch. The designer slects 4pa/m as the pressure gradient in the 12- and -15m straight sections. What diameter in should be selected in the 15 m branch section? A. 0.35 B. 0.66 C. 0.56 D. 0.46arrow_forwardDetermine the smallest metric hydraulic copper tube size that will carry 4L/min of the following fluids while maintaining laminar flow: (a) water at 40°C, (b) gasoline (SG=0.68) 25°C, (c) ethyl alcohol (SG=0.79) at 0°C, and (d) heavy fuel oil at 25°C.arrow_forwardConvert 50 GPM to ft/s in a 4" Sch 40 pipearrow_forward
- A two branch duct system of circular duct is shown below. The fittings have the following equivalent lengthof straight duct upstream to branch 4m elbow 2m. There is negligible pressure loss in the straight throughsection of the branch. The designer slects 4pa/m as the pressure gradient in all sections. What diameter in m should be selected in the 7-m branch? A. 0.44 B. 0.64 C. 0.34 D. 0.54arrow_forwardThe 28-in-diameter pump in Fig. at 1170 r/min isused to pump water at 20°C through a piping system at14,000 gal/min. (a) Determine the required brake horsepower.The average friction factor is 0.018. (b) If there is65 ft of 12-in-diameter pipe upstream of the pump, how farbelow the surface should the pump inlet be placed to avoidcavitation?arrow_forwardUsing velocity reduction method, design the duct system. Take the velocity of air in main duct as 8m/sec, air density 1.2kg/m. Coranch = 0.4 Coutlet = 1 2. Using equal pressure drop method, design the duct system. Take Ap = 1pa/m, air density 1.2kg \m. Cranch = 0.4 Coutlet = 1arrow_forward
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