Pipe Definition and 1000 Threads

Homework Statement I understand how to find the resonant frequency of a closed pipe but when the thickness of the walls varies, the resonant frequency varies. Is there a formula that i can use to find the resonant frequency of a closed pipe given the length, temperature, speed of sound and...

Homework Statement in the previous therad https://www.physicsforums.com/threads/flow-in-branch-pipe.866194/ (post #14) , i was told that water can flow in one direction only in a netwrok of pipes . However , in the notes uploaded here , the author stated that when P is below surface of B ...

1. The problem statement, all variables and given/known i am having problem of finding the major loss caused by pipe friction in this question. the formula of major loss is given by fL(V^2) / 2gD , how to get the total length of pipe so that i can gt the major head loss? . Relevant equationsThe...

Homework Statement calculate the flow rate at which oil (kinematic viscocity = (10^-6) (m^2) /s ) flow thru a cast iron pipe 100mm diameter and 115 m long under head difference of 5m Homework EquationsThe Attempt at a Solution hf = 32μLV / ρg(D^2) how to get the value of μ( dynamic viscosity)...

Homework Statement which formula is correct ? the formula in the first ? or in the second ? one is using the mean velocity , while the another one is using velocity difference between vena contarcta and velocity at exit ... Homework EquationsThe Attempt at a Solution

Homework Statement what is the meaning of number of diameter N ? why the author make L = ND ? and then divide it by D ? Homework EquationsThe Attempt at a Solution

Homework Statement How can i find the fundamental frequency of a closed piep (measuring cylinder) experimentally/ physicaly. I have done the maths and found the frequency but i want another way to prove this other than simply playing the calculated frequency back at the measuring cylinder. I...

Homework Statement why the shaer stress ( tau) formula is given by μ(dv/ dy ) = μ(-dV / dR) , why there is a negative sign there ? Homework EquationsThe Attempt at a Solution

Homework Statement what is the meaning of n here ? i only know the formula of head loss is f(L/ D ) (V^2) / (2g) Homework EquationsThe Attempt at a Solution

Homework Statement In this notes , i was told that there is an increase in pressure along the inner wall Homework EquationsThe Attempt at a Solution IMO , it should be there is increase in pressure at the outer wall , as we can see , the outer wall is longer , so the water would flow slower...

Homework Statement when we find the diameter of a pipe , we have to found the value of D and f by iteration , how to choose the start value of friction factor when we do the iteration ? Homework EquationsThe Attempt at a Solution

Homework Statement Is there a scientiically approved method for end correction of a closed pipe. Homework EquationsThe Attempt at a Solution The formula used is Delta L = (3d) where d = diameter in cm.

Homework Statement estimate the energy head lost along a short length of pipe suddenly enlarging a diameter of 350mm to 700mm which discharges 0.7(m^-3) of water per second . the solution given is Q1= Q2 = 0.7(m^3)/s 0.7 = pi ((350x10^-3)^2 ) V1 / 4 , V1= 7.28m/s 0.7 = pi ((700x10^-3)^2 ) V2 /...

Homework Statement the author stated that Q1= Q2 + Q3 , that's means the water flowing from reservoir A to B and C ... Homework EquationsThe Attempt at a Solution why can't Q1 + Q2 = Q3 ? which means water flow from reservoir A and B to C ?

Homework Statement in the notes , we can see that the formula of pumping power per unit time is (pressure)(volume rate), so pumping power is directly proportional to volume rate ... but , the author told that the pumping power is proportional to the length of pipe , and inversely proportional...

Homework Statement i was told that the friction loss is significant in short pipe , but not so significant in long pipe . However , the friction formula is given by formula f(L/D)(V^2)/2g , as L is big , friction loss is big . so the friction loss is big , right ? Homework EquationsThe...

Hello everyone I have a simple question regarding how to calculate the speed of a fluid in a normal pipe with a constant cross-section If we are given the pressure difference at the two ends of the pipe (P1 and P2) is it possible to calculate the speed of the fluid? (I think I can imagine this...

There is an equation which perplexes me and it is about calculation of average velocity in a pipe but over area. In the image, the velocity is already function of diameter, i.e, u=u(r) so how can we think velocity as a function of area? Source: Fluid Mechanics, Fundamentals and...

Homework Statement refer to part 8.2 in this problem , why P1 = P2 ? http://www.efm.leeds.ac.uk/CIVE/CIVE1400/Examples/eg6_ans.htmThe Attempt at a Solution there's some elevation between inlet and outlet , how can P1 = P2 , is the author wrong ? [/B]

Homework Statement the water flow in the pipe in upward direction . the pipe with internal diameter 60mm carries water with velocity = 3m/s under head of 30cm . Determine the resultant force on the bend of 70 degree and its direction. Homework EquationsThe Attempt at a Solution my question is...

Homework Statement We have the original equation P1A1 –P2A2(cos theta) +Fx = ρ Q( V2 –V1) , Why in the solution there , the author ignore P1A1 and P2A2cos(theta) ?Homework EquationsThe Attempt at a Solution is the book wrong ? but the P1 and P2 are not given also...

Homework Statement The formula of the force exerted on the fluid by the pipe is P1A1 –Fx – P2A2 , I don’t understand why the P1A1 is positive ?Homework EquationsThe Attempt at a Solution Assuming to the right is positive , shouldn’t the force acting on the water = -P1A1 ? Because the water...

I have derived a few equations to determine temp distribution through pipe wall in subsea conditions. However I am finding it difficult to determine what the wall temperature will be. I need to know and use this temperature to further my analysis. As of now I know the following parameters...

Hello all, I am a mechanical engineer, graduated just last year. Although I am not working with fluid mechanics right now, I was browsing through my fluids book from school and saw the section on pipe networks. As I was reading, I developed this question which I could not find an answer to in...

Hi all, I am analysing the flow of water in a subsea pipe, and have been getting stuck in trying to solve the energy equation to plot a temperature distribution across the pipe diameter I have derived the equation as such seen in my attachement. But my main question is how should/would I...

Homework Statement i know that the formula of head loss is (V^2) / 2g , where v =velocity , but , why did the author want to change it to k[(Q)^1/n ] ? Homework EquationsThe Attempt at a Solution

Homework Statement why the force at outlet A shouldn't be 0.0707(12 cos120 - 12) Homework EquationsThe Attempt at a Solution as we can see from the figure , outlet A make an angle 120 with the horizontal line

Homework Statement why the author gave the change in velocity as (25- 25cos115) , shouldn't it be final - initial velocity , which is (25cos115 -25) ? Homework EquationsThe Attempt at a Solution

Homework Statement for part c , why when the vane is moving , the flow rate doesn't change ? ? Homework EquationsThe Attempt at a Solution The flow rate is given by the formula Q=Av , where A = area , v = velocity . IMO , when the velocity of vane change , the flow rate is no longer 0.687kg/s...

I am a structural engineer and have a situation where we have a corrugated plastic pipe formed inside of a square concrete column (pipe is 4" in diameter and column is 16x16). The top of the corrugated pipe is flush with the top of the concrete and open to the atmosphere. The bottom of the...

Homework Statement Homework Equations The Attempt at a Solution Im confused by this question, just looking at the diagram without any maths you can see what would happen. C and D would want to reach equilibrium and be at the same level so the pressure down on D would be the difference in...

Homework Statement what does the author mean by if P is below the surface of B then h2 and Q2 are both 0 ? Homework EquationsThe Attempt at a Solution at the last second line from the bottom , the author gave if P is below the surface of B then water must be out of B and Q1 +Q2 = Q3 ? both...

Homework Statement An engineer is planning for a network of pipes to a residential tower containing 360 apartments each one of them consumes 0.05 liters/s of water what is the least possible pipe discharge for the main pipe in the network if the fastest speed of discharge in the pipe is 4m/s...

Homework Statement http://imgur.com/DSBFIeO I want to find the flowrate through this pipe based on the pipe's diameter, height of the pipe and the pressure difference. I tried to use Bernoulli, but since the diameter on either end is the same, the terms cancel out. I guess Bernoulli's equation...

Homework Statement Homework Equations Is my part a correct and am I on the right track for part b? If not please give me some suggestions to get me closer to the right track. Also, how would I even begin c.? We have literally done no examples like this in class. The Attempt at a Solution...

which has different radiuses at both end. Its actually two pipes merging after the entrance going straight and somewhere close to middle of the pipe it's bent 90°. So for simple pipes it's =4*Q π*r^3 But what for the pipe I...

Hi, I've been always using eq. I=Pi*(D^4-d^4)/64 to find moment of inertia of a pipe. Recently I've seen that moment can be in different directions, and then it is expressed differently. So what is the difference between Ixy and Iz?

Look at my picture. I understand venturi pipe when water is flowing...What if we close both entrance and exit of venturi pipe . Will all 3 pressures be equal.

Homework Statement Hello everyone, I hope that you guys could lend me a hand. I need to calculate the heat loss at any point over a long pipe while considering lambda of the pipe. I am trying to use octave to find a reasonable flow-rate to keep the temperature loss to a minimum at a reasonable...

Dear all, I would like to have your help for a problem that i face. I know that it is a little bit ridiculous, but my brain is stacked right now! I have a helium compressor that i want to fill it with helium at room temperature 293K @ 1.013bar. This compressor will be connected with a pipe. As...

This is not homework, but something work-related. However, I will post it here since it's homework-relatable. 1. Homework Statement Known variables: Qin , A (and obviously the diameter D of the pipe as well as g = 9.81 m/s2). The pipe outlet and the top of the tank is at atmospheric...

"Consider a fully developed laminar flow in a circular pipe, perform force analysis on an element of the real fluid." I've just started this type of question, and I'm a bit confused about where to go from here: I've managed to do a force balance horizontally to show that the partial derivative...

Blocking the intake of an air flow station I built results in the FPM shooting up along with the vacuum. ie: wide open both ends 4" pipe with inline fan reads . 5" wc / -190 pa / 3700 fpm on instruments monitoring intake pipe. Blocking the intake increases both the vacuum to -470 pa and...

I'm not really sure where to post this. I saw that this Homework section exists even for technically non-homework (I'm designing a machine at work, but the problem is homework-esque and my fluid dynamics knowledge is rusty at best). I'm not sure if this introductory or advanced, and the template...

Hi, I would like some guidance about a piping problem I have. I would like to know how to solve this shear stress equation for a narrowing pipe. This equation gives the shear stress on the edges of a cylindrical piece of fluid having radius r and length L within the pipe. I would like to know...

How loud would a 105 db speaker be in a 3 inch metal pipe?

Hi, To help me understand two phase cooling etc. I have some simplified heat pipe questions: If a sealed, vertical pipe, half filled with water has heat applied to its bottom half and the top half is held at 120C, is it safe to say that the inner surface of the bottom half of the pipe will also...

Check out the following video of a magnet falling through a copper pipe. http://www.sciencealert.com/watch-what-happens-when-a-magnet-is-dropped-through-a-copper-pipe

Hi all, Is there a correlation between an Air Dryer capacity and the exhaust pipe diameter? How would a small exhaust pipe diameter (not able to exhaust air enough) affects the capacity of an air dryer? If it does, could you expand on this? Thank you

Homework Statement We have a pipe open at both ends and having the length of 1 meter. After putting it into a tub of Mercury and thus filling it to the half, we close the upper end of it, and then remove it from the tub. What is the height of the residual column of the Mercury in the pipe...