Calculating Volume of Water Flow in a 14mm Diameter Pipe at 2m/s

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  • Thread starter mathdad
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In summary: Thank you for the help.In summary, Water in a 14mm diameter pipe flows at 2m/s. How many liters flow along the pipe in 1 minute?
  • #1
mathdad
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1

Water in a 14mm diameter pipe flows at 2m/s. How many liters flow along the pipe in 1 minute?
 
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  • #2
Hi RTCNTC. Any thoughts on how to begin?
 
  • #3
greg1313 said:
Hi RTCNTC. Any thoughts on how to begin?

How to begin?

How about using conversion factors?

We must convert units to mm, right?
 
  • #4
RTCNTC said:
How to begin?

How about using conversion factors?

We must convert units to mm, right?

Yes, converting all measures of length to the same units would be a good start. I think I would convert everything to cm since 1 liter is 1000 cm³. I would also convert all measures of time to minutes.

Now we must determine the volume of water that flows along the pipe in one minute...what shape can we use? What are its dimensions?
 
  • #5
14 mm is 1.4 cm so the cross-section area of the pipe is \(\displaystyle \pi (1.4)^2= 1.96\pi\) square cm. Since the water flows through the pipe at 2 m/s, in one second, the water that flows through the pipe can be thought of as a cylinder with that area and length 2 meters. What is that volume? So how much flows through the pipe in 1 min= 60 seconds?
 
  • #6
MarkFL said:
Yes, converting all measures of length to the same units would be a good start. I think I would convert everything to cm since 1 liter is 1000 cm³. I would also convert all measures of time to minutes.

Now we must determine the volume of water that flows along the pipe in one minute...what shape can we use? What are its dimensions?

My Work:

d: Pipe Inner Diameter (m)
Qw : Water Flow Rate (m^3/h)
v: Water Velocity (m/s)

v = Qw / (3600 * π * (d / 2)^2 )

2 = Qw / (3600 * π * (0.014 / 2)^2 )
2 = Qw / (3600 * π * (0.014 / 2)^2 )
2 = Qw / 0.55417
Q = 1.10835 m^3/h

1 dm^3 = 1 liter
1.10835 * 1000 = 1108.35 liters/hour
1108.35 / 60 = 18.4725 liters(minute)

Is this right?
 
  • #7
The volume $V$ of a cylinder in terms of its diameter $D$ and height $h$ is:

\(\displaystyle V=\frac{\pi}{4}D^2h\)

We are given the diameter, and to determine the height of the cylindrical volume of water, we may use the kinematic relationship between distance $d$, average speed $v$ and time $t$ to get its height:

\(\displaystyle d=vt\)

And so, we have:

\(\displaystyle V=\frac{\pi}{4}D^2vt\)

Putting in the given values, and converting units, we obtain:

\(\displaystyle V=\frac{\pi}{4}\left(14\text{ mm}\frac{1\text{ cm}}{10\text{ mm}}\right)^2\left(2\,\frac{\text{m}}{\text{s}}\cdot\frac{100\text{ cm}}{1\text{ m}}\cdot\frac{60\text{ s}}{1\text{ min}}\right)\left(1\text{ min}\right)\cdot\frac{1\text{ L}}{1000\text{ cm}^3}=\frac{147}{25}\pi\text{ L}\approx18.47\text{ L}\quad\checkmark\)
 
  • #8
MarkFL said:
The volume $V$ of a cylinder in terms of its diameter $D$ and height $h$ is:

\(\displaystyle V=\frac{\pi}{4}D^2h\)

We are given the diameter, and to determine the height of the cylindrical volume of water, we may use the kinematic relationship between distance $d$, average speed $v$ and time $t$ to get its height:

\(\displaystyle d=vt\)

And so, we have:

\(\displaystyle V=\frac{\pi}{4}D^2vt\)

Putting in the given values, and converting units, we obtain:

\(\displaystyle V=\frac{\pi}{4}\left(14\text{ mm}\frac{1\text{ cm}}{10\text{ mm}}\right)^2\left(2\,\frac{\text{m}}{\text{s}}\cdot\frac{100\text{ cm}}{1\text{ m}}\cdot\frac{60\text{ s}}{1\text{ min}}\right)\left(1\text{ min}\right)\cdot\frac{1\text{ L}}{1000\text{ cm}^3}=\frac{147}{25}\pi\text{ L}\approx18.47\text{ L}\quad\checkmark\)

Ok. I was right.
 

FAQ: Calculating Volume of Water Flow in a 14mm Diameter Pipe at 2m/s

1. What is the definition of "Number of Liters"?

The "Number of Liters" is a unit of measurement used to quantify the volume of a substance. It is a metric unit and is equivalent to 1 cubic decimeter (dm3).

2. How is the "Number of Liters" different from "Number of Gallons"?

The main difference between the "Number of Liters" and "Number of Gallons" is their unit of measurement. Liters are part of the metric system, while gallons are part of the imperial system. Additionally, one gallon is equivalent to approximately 3.785 liters.

3. How do you convert "Number of Liters" to other units of volume?

To convert "Number of Liters" to other units of volume, you can use conversion factors. For example, to convert liters to milliliters, you would multiply the number of liters by 1000. To convert liters to cubic meters, you would divide the number of liters by 1000.

4. Can "Number of Liters" be used to measure any type of substance?

Yes, the "Number of Liters" can be used to measure the volume of any type of substance, including liquids, gases, and solids. It is a universal unit of measurement for volume.

5. How is the "Number of Liters" measured in a laboratory setting?

In a laboratory setting, the "Number of Liters" can be measured using various equipment such as beakers, graduated cylinders, and volumetric flasks. These tools are marked with volume measurements in liters, allowing scientists to accurately measure the volume of a substance.

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