I have to estimate the Reynolds number of the fluid flowing around a blade but I only have one detail: the length of the blade is 0.66m.
I have no idea how to do it and I gotta submit the assignment in a week, I am desperate for help here.
My first post here!
I have calculated everything i need, except the thickness of the second layer dZ*, therefore i can't solve V3/V2=(R2ˇ2)/(R3ˇ2)
Trying for days now, i would appriciate any help.
I assume the water to start flowing from rest at position 1, hence ##v_1 = 0##. Applying the continuity equation, ##A_1 v_1 = A_2 v_2##, we find the (wrong) result that the velocity at position 2 is ##v_2 = 0## also! (We assume that ##A_2## is small but finite)
Hence, to answer the question...
Homework Statement
Fire hose has diameter of 4.0 cm and flow rate of 10 L/s. There is pressure of 2.2 bar inside the hose. How high the water can go at best? Water density is 1.00E3 kg/m^3 and air pressure outside the hose is 1.0 bar.
Homework Equations
Flow rate
$$ Q = Av $$
Newtons...
1)In a flowing fluid in laminar fashion we know that it flows in planes which slides over each other, Lets take a fluid element (cylindrical) in a pipe(Radius=R) the resistive force is (stress)(cross section area of cylinder with radius 'r') acting in backward direction, now if I take Flow...
Imagine you have a vertical pressure head 2m tall with water flowing down to height 0m and emptying. Through this length we have 3 identical tubes of resistance R and length L. Assuming I know the volumetric flow rate(Q) as a function of height, how can I calculate the resistance of each tube...
Hello!
1. Homework Statement
Symbols and variables:
##\dot{V}## : flow rate
##H## : Hydraulic head
##g = 9.81 \frac{N}{kg}##
##P_{atmosphere} = 101325Pa##
##\rho = 1000\frac{kg}{m^3}##
I am given a piping system, with serie and parallel pipes, they start from one point and go back in to one...
Suppose you have a spherical cavity, with a flow of a fluid ( in particular water), entering it from one side. What will happen to this flow? Will it create turbulences? Will speed increase? Will eventual waves entering the cavity be reflected, so creating waves with bigger amplitude?
Suppose...
In lower-division physics classes, air resistance is usually ignored to make the mathematics of projectile motion easier to understand.
When air resistance is included, it's often stated that at lower velocities, air resistance is proportional to the velocity of the object,
Fair ∝ kv
At...
Hi there.
Everyone knows about Torricelli's theorem that says about , in a too big container (opened) the speed of the liquid is given by:
v=√(2gh)
This result is just for containers that have a hole in the side and the fluid goes out perpendicular to the gravity. And also this result is just...
Homework Statement
Can anyone please give me hard and interesting problems regarding fluid mechanics problems such as hydrostatic and air prssure bouyance force and Bernoullis equation(Bernoullis equation problems only for liquids)? I tried looking for them but the ones I found were quite...
Homework Statement
Consider a spherical particle immersed in water. It will experience random collisions with the surrounding water molecules. Suppose there are such water molecules around the particle. Half (n/2) of the water molecules will push the particle to the right and the other half to...
Homework Statement
In my book , i was told that when the drainage of surface is high then the surface runoff will be low . However , i dont think it's correct .
Homework Equations
The Attempt at a Solution
Definiton : Runoff can be described as the part of the water cycle that flows over...
Hello, PF!
I’m trying to model a real piping system, which has multiple inlets and one outlet, so I can’t use Bernoulli’s equation. Instead, I’m planning to use the generalized macroscopic energy balances as shown in BSL, which allow for any number of inlets and outlets. However, first I want...
Hi I'm trying to understand a paper that approximates the solution to Burger's equation (1D Navier Stokes) by a doing a one-dimensional cellular automaton simulation. I'm having a hard time understanding how all these topics connect. I have seen and walked through various demonstrations that...
So I was playing around with Fluid Pressure and Flow over on PHET animations and noticed something odd. When a fluid with high flow rate is going from a large pipe to a small pipe a lower density increases the pressure. And a higher density lowers the pressure in the narrow part of the pipe. My...
Homework Statement
Homework Equations
0=viscous+gravitational+pressure
I saw in the solutions that pressure=0 in this case, but why?
I also knew that : accumulation= flow in - flow out+generation, why not use this one?
The Attempt at a Solution
(their solution)
We are interested in...
Consider a small rigid spherical particle of radius a, fully immersed in a viscous incompressible Newtonian fluid of shear viscosity η above a hard-wall with stick (no-slip) boundary conditions, located at the plane z = 0. A constant positive (external) torque Tx is applied on the particle.
My...
I am trying to model fluid flow and losses through a component (e.g., pipe) using REAL GAS properties since 1) I have access to RefProp from NIST, and 2) I am dealing with refrigerants, which are far from ideal.
I have seen nowhere an analysis of fluid flow losses (e.g., drag, friction...
Homework Statement
Problem in attached image
Homework Equations
$$P_1+\frac{\rho v_1^2}{2}=P_2+\frac{\rho v_2^2}{2}$$
The Attempt at a Solution
I understand everything in the solution except why $$P_A-P_B=h(\rho_{Hg}-\rho)g$$ Why do we have to subtract the density of water from that of...
Hey so I am learning physics on Khan academy and they had a video on Pitot tubes:
https://www.khanacademy.org/science/physics/fluids/fluid-dynamics/v/venturi-effect-and-pitot-tubes
I had a question. I understand that the lower part of the pitot tube in the video is measuring the pressure...
This is probably a simple question but I am really struggling as to where to start.
We have a tank of compressed air,
Volume of tank (V1) = 0.2litres
Pressure of tank (P1) = 206.8 bar
Regulator Pressure (P2) = 58.6 bar
I would like to find the volume of air that can pass through the regulator...
When compared to laminar flows, the fluid "sticks" with the solid surface longer in case of turbulent flows. For example, the angle of separation for flow over a circular cylinder is 80 degrees for laminar flows, and 140 degrees for turbulent flows. What is the reason?
Homework Statement
I would really appreciate it if you could give me a hand with this exercise, not sure on what I've done.
Data:
Moody:
L=55*10-3m
D=10-1m
k=0.0002m
Homework Equations
##Re=\frac{D*u*ρ} {μ}##
##Re=\frac{4*m} {pi*D*μ}##
Relative roughness ##ξ=\frac k D## where k=rougness...
Homework Statement
I have a confusion regarding areas.
Usually in fluid flow I am using the A=(pi*D^2)/4
However in heat transfer we usually use A=pi*D*L
Could you please explain this?I mean in first case(fluid flow) it is cross sectional area and in the 2nd case(heat transfer) is like the...
Homework Statement
I would really appreciate if you could give me some hints regarding what exactly to iii)
Homework Equations
we know they are in parallel
so Q=Q1+Q2+.....+Qn
delta hloss=delta hloss1+deltahloss2+......
delta P=delta P1=delta P2=......
The Attempt at a Solution
We know flow...
Hey everyone, I'm new to physics forums and I would really like some help with my physics report. For my high school physics topic I have chosen an experiment where holes with differing diameters are drilled into the centre of the bottom of PVC pipe caps and the time taken for the each cap to...
Homework Statement
Hello,Could you please lend me a hand with this problem?I would really appreciate it.
Question:[/B]
Their Answer:
KL=2*0.75(2 elbows) D=5*10^-2 m ;f=0.001(fanning friction factor)
Assumptions I made:
Point 1 which is at the top of the liquid in the tank:
h1=23 m...
Homework Statement
Hello, I am struggling with this heat transfer and fluid flow problem.I would really appreciate if someone could have a look over what I have done on it.
I am not sure if what I have done is correct ,I would really appreciate if you could tell me if it is correct or wrong.And...
Homework Statement
I would really appreciate if someone could help me out with this exercise in fluid flow/heat transfer ,because I really struggling with it.Below I am attaching photo of problem+table with values. Thank you in advance !
Homework Equations
Question link:[/B]...