Water, at 10°C, flows from a large reservoir at the rate of 1.5*10^−2 m^3/s through the system shown in Fig. 11.11. Use PIPE-FLO® to calculate the pressure in the tube at point B.

Question

Water, at 10°C, flows from a large reservoir at the rate of [latex] 1.5 imes 10^{−2} m^3/s[/latex] through the system shown in Fig. 11.11. Use PIPE-FLO® to calculate the pressure in the tube at point B.

Accepted Answer

Begin by using the “system” menu in PIPE-FLO® to establish units and fluid zones as defined by the problem.
For the pipe specification, choose the “Copper Tube H23” drop down menu (SYSTEM/SPECIFICATIONS/NEW). Double click and select “K” for type K copper tubing similar to the way that “Schedule 40” was selected for steel pipe. After choosing Type K, verify the roughness value that appears on the right side of the pipe properties box, understanding that these values are good checkpoints, and also that they can be manually adjusted.
Next place a tank on the FLO-Sheet® and set up its variables in the properties grid. Also, draw the pipe in the relative shape as shown in Fig. 11.11. Be sure to include the three elbows and the pipe entrance under the “Valves and Fittings” category in the properties grid for the pipe.
Under “basic devices” select “flow demand” and insert it at point B to represent the point at which this section connects to the rest of the system. Specify the flow rate past this point, which is simply the total flow rate given for the problem. Independent analysis of just this section is possible with this approach.
After all components have been entered, choose “CALCULATE” to display all the answers required in the problem statement. Remember, you may have to turn on the values shown for each component as done in previous examples through the “Device View Options” menu on the right.
The results and the overall set-up of the system are given below. The pressure in the pipe at point B is 86.76 kPa gage. It is a positive gage pressure because the pipe is 12 m below the water surface in the open tank. However, the energy losses as the water flows out of the tank and through
Solution the piping and fittings causes the pressure to be somewhat lower. Note that the pressure drop through the pipe is 72.05 kPa.
it is recommended that you also work this problem by hand and verify your answers with the PIPE-FLO® results shown here. (Note: This is the same problem as Practice Problem 11.1 at the end of the chapter.)

Question 11.7: Water, at 10°C, flows from a large reservoir at the rate of ...

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