Maťa Drapova GJAR TMF-team 2013
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Transcript of Maťa Drapova GJAR TMF-team 2013
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Maťa Drapova GJAR TMF-team 2013
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Fire hose
Consider a hose with a water jet coming from its nozzle. Release the hose and observe its subsequent motion. Determine the parameters that affect this motion.
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Teoretically Water jet flowing in the hose, what is
happening:1. water fill the hose completely2. the hose is under pressure3. tries to get straight
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Practically Hose type: „B“ „C“
Lenght: 20m 20mWeight: 44kg + 50kg (with water) 54kg + 100kg (H2O)
Diameter: 52 mm 75mmVolume: 200l 400l
What we’ve got:
What we did:
1. we composed the hoose to folds (1-7)2. we made various spirals with differents
diameters or coils (6-22)3. we let the hose behave under differents
pressures
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Then we just left it behave:
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Practically• fluid mechanics theory• red pointers = arrows• force is the reason for the
change of the direction of the move(not change of move)
• equal and opposite forces
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type „C“
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What it looked like: Pressure: Time of filling: Other infos:
0,25 MPa 5,97sLength of fold:
5,30 m Number of folds:
1
0,25 MPa 4,45sLength of fold:
1,9mNumber of folds:
4
0,25 MPa 4,3sLength of fold:
1mNumber of folds:
7
0,25 MPa 2,3sLenght of fold:
0mNumber of folds:
0
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What it looked like: Pressure: Time of filling: Diameter of the spiral: N° of coils:
4:39 – 4:49 0,25 MPa 4,1s 38 cm 22
9:05 – 9:15 0,25 MPa 3,3s 130 cm 6
16:50- 17:02 0,25 MPa 4,4s 85 cm 10
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type „B“
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Other: Pressure: Time of filling:
Number of folds:1
Lenght of fold:5,30m
0,25 MPa 6,8s
Number of folds:4
Lenght of fold:1,90m
0,25 MPa 6,4s
Number of folds:7
Lenght of fold:1m
0,25 MPa 4,7s
Number of folds:0
Lenght of fold:0m
0,25 MPa 3,6s
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Conclusion
- graph of the dependence
of time of filling the hose and number of fold we did
- we see that the increased diameter (and volume) affected the time of filling 0 1 2 3 4 5 6 7 8
0
1
2
3
4
5
6
7
8
CB
Number of folds
Time of filling [s]
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Sources:
• http://www.ehow.com/facts_6940037_fire-recoil-water-turned-on_.html
• http://physedu.science.upjs.sk/kvapaliny/rovkonti.htm
• http://www.off-ladhyx.polytechnique.fr/publications/documents/doare2002rp-2pp.pdf
• http://www.newton.dep.anl.gov/askasci/phy99/phy99x11.htm
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SPECIAL THANKS TO: