Fluid Dynamics: Using Bernoulli's equation and Volume Flow Rate

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SUMMARY

The discussion focuses on applying Bernoulli's equation and the continuity equation to determine the height at which water narrows from a 15.0 mm diameter faucet to a 10 mm diameter stream. The initial velocity of the fluid is calculated as approximately 1.70 m/s, while the final velocity is found to be around 3.82 m/s. Using these velocities, the height is determined to be 0.597 meters. The calculations are confirmed to be correct based on the principles of fluid dynamics.

PREREQUISITES
  • Understanding of Bernoulli's equation
  • Familiarity with the continuity equation in fluid dynamics
  • Knowledge of volume flow rate calculations
  • Basic proficiency in algebra and unit conversions
NEXT STEPS
  • Study the derivation and applications of Bernoulli's equation in various fluid scenarios
  • Explore the implications of the continuity equation in different cross-sectional areas
  • Learn about the effects of viscosity on fluid flow and how it alters Bernoulli's principles
  • Investigate real-world applications of fluid dynamics in engineering and environmental science
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Students in physics or engineering courses, educators teaching fluid dynamics, and professionals in fields requiring fluid flow analysis will benefit from this discussion.

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Homework Statement


Water flowing out of a 15.0mm -diameter faucet fills a 1.50 L bottle in 5.00s. At what distance below the faucet has the water stream narrowed to 10 mm in diameter?


Homework Equations


Bernoulli's equation: P_1+pgh+1/2pv^2=constant
Q(volume flow rate)=vA
Continuity Equation: A_1(V_1)=A_2(V_2)

The Attempt at a Solution



Finding the intial velocity of the fluid:
A_1=pi(0.0075m^2)= 1.77*10^-4 m^2
Q=1.5L/5.00s=0.3L/s --->Q=vA (Rearrange the equation)--> v_1=Q/A_1= 0.0003m^3/s / 1.77*10^-4m^2 = 1.69765..m/s

Finding the final velocity of the fluid:
A_2=pi(0.005m^2)=7.85*10^-5 m^2
v_2=Q/A_2= 0.0003/7.85*10^-5 m^2 =3.81971...

Finding the height:
1/2pv_1^2=pgh+1/2pv_2^2
h=(1/2*p*v_1^2)-(1/2*p*v_2^2)/pg---> (p cancels out)
=(1/2*v_1^2)-(1/2*v_2^2)/g=0.597m

But, I feel that I must have done something wrong in my calculations. I don't know if my answer makes sense.
 
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Looks correct to me.
 
Okay,thanks!
 

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