Chapter 10 Flow in Conduits

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2 Equations for the Velocity Distribution the turbulent boundary-layer equations Equations for the Friction Factor, f the resistance coefficient for turbulent flow in tubes that have smooth walls Moody Diagram

3 To provide a more convenient solution to some types of problems, the top of the Moody diagram presents a scale based on the parameter Re f1/2. This parameter is useful when hf and ks/d are known but the velocity V is not. In the Moody diagram, Fig., the variable ks denotes the equivalent sand roughness. That is, a pipe that has the same resistance characteristics at high Re values as a sand-roughened pipe is said to have a roughness equivalent to that of the sand-roughened pipe. Table 10.4 gives the equivalent sand roughness for various kinds of pipes. This table can be used to calculate the relative roughness for a given pipe diameter, which, in turn, is used in Fig. Moody chart to find the friction factor Using the Darcy-Weisbach equation and the definition of Reynolds number In the Moody diagram, curves of constant from the left to right. are plotted using heavy black lines that slant When using computers to carry out pipe-flow calculations, it is much more convenient to have an equation for the friction factor as a function of Reynolds number and relative roughness

4 It is reported that this equation predicts friction factors that differ by less than 3% from those on the Moody diagram for < Re < 10 8 and 10-5 < ks/d < Combined Head Loss The Minor Loss Coefficient, K When fluid flows through a component such as a partially open value or a bend in a pipe, viscous effects cause the flowing fluid to lose mechanical energy. drop in piezometric head that is caused by a component. drop in pressure that is caused by a component Mean velocity

5 Combined Head Loss Equation Total head loss = {Pipe head loss} + {Component head loss} 10.9 Non-round Conduits For rectangular cross section:, area =, perimeter = 2L+2w=2(L+w)

6 The head loss per kilometer of 20 cm asphalted cast-iron pipe is 12.2 m. What is the flow rate of water through the pipe? Q A heat exchanger consists of a closed system with a series of parallel tubes connected by 180 elbows as shown in the figure. There are a total of 14 return elbows. The pipe diameter is 2 cm, and the total pipe length is 10 m. The head loss coefficient for each return elbow is 2.2. The tube is copper. Water with an average temperature of 40 C flows through the system with a mean velocity of 10 m/s. Find the power required to operate the pump if the pump is 80% efficient.

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