Pipe Definition and 1000 Threads

Homework Statement A speaker is placed near the open end of a 0.5m pipe (closed on the other end). what is the speed of sound if the pipe resonances at 600Hz for n=2? Homework Equations fn=(2n+1)*V/4L Or? fn=(2n-1)*V/4L The Attempt at a Solution I saw both versions of the...

Dear All, I did post this issues in the physics forum, however there is somebody ask me to post it in the engineering forum. With this I re-post it here. Does anyone here familiar with a theory called Principal Virtual Work (Equilibrium theory) ? I read somewhere that with this theory, i...

Dear All, Does anyone here familiar with a theory called Principal Virtual Work (Equilibrium theory) ? I read somewhere that with this theory, i could relate(for pipeline application - collapse & buckling) the components for ovalisation, external pressure and hoop strain. Appreciate if...

Can someone please help me. I have a pipe 200mmOD x 160mmID welded to a Steel structure The pipe is 100mm long with a 12mm plate x 250Dia welded at the end of the pipe. The steel structure weighs 7500Kg I have to lift the structure with a crane. The crane has a cable with a loop which can...

a newbie here so not sure if this is in the right place! i'm in the middle of a paper that I'm doing for college, investigating the effects of roughness on air flow. i set up 2 pipes, 1 rough and 1 smooth (800mm long, 36mm diameter), in a wind tunnel, measured the velocity of the air entering...

My ultimate goal is to spec a motor for a shop tool. It is a stand to rotate a glorified pipe. The pipes are quite large (up to 19,000lbs). The pipe will sit on four wheels. Two of the wheels are motorized. I have a good idea of the torque/hp needed to accelerate to the desired angular velocity...

Hi all, Need help determining what size diameter for some pipe. I just want someone to check my calculations, hopefully they're okay. I attached a quick sketch of the set up. Here are the knowns: Qmin = 4000gpm ΔP = 32psi L = 65ft e(roughness of commercial steel pipe) = 0.00015ft...

Through a spiral pipe is circulating a fluid with high speed, this will lead to many effects and forces like inertia and gyroscopic effect. http://www.2live.ro/demo/Serpentina.bmp I do not know how to approach the problem in order to find the distribution of forces...

What should I consider if I have three centrifugal pumps then the water of these three pumps flow into one pipe? How to calculate the pressure in the intersection of the three pipes?Thank You.

1. Homework Statement A 1.2m diamater steel pipe carries oil of relative density 0.822 under a head of 70m of oil. What minimum thickness of 120MPa (yield stress) steel would be required for a safety factor of 1.5? 2. Homework Equations Head = pressure/rho.g thickness = (safety...

In the diagram attached I have a pipe (standard concrete) that is going from point A (Entrance) to point B (Exit). Standard water is the fluid within the pipe. Point A (entrance) has a constant uninterrupted supply of water at a velocity of 0.7m/s, how do I find the correct velocity at point B...

Homework Statement (a) Water flows through a pipe of radius 4 cm at a rate of 3.5 m/s. Suppose each water molecule is singly ionized (highly unrealistic). What is the electric current density associated with the flow of these ions? b) What is the electric current in the pipe? Homework...

I don't understand the ideas behind the continuity equation when applied to a vertical pipe. In all the questions I see regarding a vertical pipe of constant diameter, I see that the fluid's velocity will remain constant while traveling through the pipe. Common sense will tell you this isn't...

Homework Statement This is in the pipe flow section and the solution treats this question like a pipe. Here is the solution: As you can see I circled the pipe flow equations in red. If this is the case shouldn't there be frictional head loss, hf, caused by the walls of the tank? I...

Homework Statement here the situation, i have a straight pipe with a spheroid-like shape placed in the middle which is supported by two supports. I would like to calculate the csa of the spheroid section using 50 iterations but i am finding it difficult to calculate. link...

Homework Statement An engineer is designing a system that requires transporting .01 m^3/s of helium at 15°C and 120 kPa. The velocity of the pipe is limited to 40 m/s. What size (diameter) of pipe is needed? My question is what equation do i need to solve this problem? Homework...

Good day to all, was wondering how a pressure regulator doownstream will affect the flow rate of compressed air through a pipe. Anyone has any insights on this? the pressure regulator is to reduce the downstream pressure but I'm really confused how the flow will be affected. For instance, will...

1. Water at T1=240 C and P1=16 MPa is at 2 km depth. A drilling hole with diameter 0.2 m has the water flowing up with mass flow rate at 2 kg/s. The hole is considered adiabatic(no heat transfer). I need to find the following values at the top of the hole: Enthalpy(h), temperature(T2)...

Homework Statement The Attempt at a Solution I am interested in why my method is flawed: Alright I know how to do this problem. Essentially you solve mass flow rate = rho * double integral of u dA. HOWEVER, I decided to do this differently. I know that I can solve for the average u from...

Hi Everyone, I'm working on some inductance calculations and was wondering if anyone knows of any formulas (or methods) to determine the inductance of a straight piece of copper pipe, if the ID, wall thickness, and length are known? The closest thing I have found so far was the inductance of...

If I have a series of pipes and containers (containing liquid) soldered together to create a circular path, and then heated at a particular point or multiple points, is it possible to somehow have the gas move in a particular direction without the gas every leaving the system? I'd prefer not to...

Hello All, Problem Statement : This is for design of a 24" sparge pipe for transporting hot water (85 deg C) for over 60 ft. Asked to calculate the Back pressure Data : Liquid in the pipe: water Flow rate : 3010 m^3/hr = 0.83611 m^3/sec Pipe Dia : 24" = 2.032 mts No elbows...

It has been several years since I have dealt with fluid mechanics. I have a 4hp pump that circulates the water in a 4ft swimming pool. A 2in pipe is connected to the outlet which runs up about 1ft. It passes through a shutoff valve and is then split into two streams, both 2in pipe, by a...

Homework Statement The Attempt at a Solution So first I found the density of the air coming in and going out. Next I used conservation of momentum with two forces caused by the pressures at the entrance and the exit of the nozzle. I end up getting 1004 which is not the same as...

I am calculating various pressure drops in a pipe and am and am having trouble calculating the pressure at a certain point, for a set case. This is the pipe... http://i50.tinypic.com/141mikg.jpg A and B are vents, through which air passes and travels on up the pipe, where is it discharged to...

Please see attached for question and attempted solution, Im pretty sure this is correct, can anybody confirm? Regards, A

Okay I'm currently doing a thrust block design for a water supply system. The new line is a 250mm line. The water is fed from water towers where council has said the operating head is about 30m. I've set up my thrust block program in excel and it is all working fine. The only trouble is I'm...

This is a real world project. I'm building a giant roll-up window shade to be used for a special effects green screen. The first real model attempt (without math) failed. See the two pictures of the tube structure being held up by chairs. The only axle was about 3ft of 1.5" pipe at each...

Hi there, Had a physics project in university that looked at the heat transfer of a pipe in a cement block for snow melting. When I modeled it using computational fluid dynamics, I just did a 2D model and simplified it by saying that the fluid would be moving fast enough through the pipe that...

Let's say a receiving device that requires compressed air is 1.5 miles away from the source and demands 600 cubic feet per minute. Let's say the pipes have a diameter of four inches and already contain air at 90psi. If friction in the pipes would be ignored, it would require the same amount...

Hi, I'm looking at the solution to a question on fluid flow through a rigid pipe. Original equation: \mu u = 0.25r^{2} dp/dx + Aln(r) + B After applying boundary conditions: \mu u = 0.25dp/dx (r^{2} - a^{2}) I don't understand how the constants have been solved for. Below is as far as I get...

I have a pipe that needs to be 5 degrees below the external temperature outside(eg- 45 degrees outside means 40 degrees within). I cannot remove the pipe or anything, all I can change is the what the pipe passes through, for example if it passes a block of ice then technically the pipe would...

I am trying to ascertain if a 150NB Stainless Steel pipe lagged with 50mm thick insulation would also require to be trace heated. The insulation used is rockwool. The parameters are that the pipe must not freeze solid given 5 straight days of -15 C with static flow. Wind chill is negligible. The...

Hello everyone! I'm in high school and attempting to build a ruben's tube. I am on a very strict budget and came across free brass tubing, but the diameter is 1 inch. All the tutorials I've seen use a diameter of at least 2inches if not more. Will a pipe with a one inch diameter work...

I need to figure out the best way to improve drainage of spring water flowing through my property. The water from my neighbour’s spring flows 10m through a pipe into a manhole on my side. The water level in this manhole is always 10-20 cm higher than the in and out pipes. The water then flows...

Hi all, I have a practical problem at work that I need some help with please! In the ground, there is a gas pipe that runs alongside a burst water pipe. There is a hole in the gas pipe of approx 40mm in diameter, and the water is blasting the hole with constant water pressure of 4000...

Homework Statement a pipeline which connects two reservoirs which has a water level difference of 5m. the total length of the pipe is 700m and the length of section AB is 300m. Point B is at a level of 3m above the free surface of the water in reservoir A. If the diameter of the pipe is 1m and...

I am a little confused about the pressure and hose diameter relationship. Let's say I have a pump pumping at a given pressure; I connect a hose of a certain diameter and attach a pressure gauge to the other end of the hose and get a pressure reading. Now let's say if i conduct the same...

Homework Statement "A 10m long, sloping pipe has an entrance of 100mm diameter water velocity at the pipe entrance is 4m/s and a gauge pressure is 35,000n/m^2. the pipe abruptly expands to 200mm diameter halfway along its length and the exit point is 0.5 below the entrance. The head loss due...

Homework Statement A string 40.0cm long of mass 8.50g is fixed at both ends and is under a tension of 425N. When the string is vibrating in its third overtone, you observe that it causes a nearby pipe, open at both ends, to resonate in its third harmonic. The speed of sound is 344m/s. a) How...

Homework Statement An observer listens to a vibrating string using a cardboard tube of length 1.4m placed close to his ear (one end closed). The string is excited so as to vibrate at its fundamental frequency, and the tension is increased slowly. The intensity of the sound heard by the...

Could someone please help me with this?? I am working on a problem with 2 pipes, one 100mm and one 150mm in diameter. The shape of the pipeline is a square. half is 100mm pipe and the other half is 150mm pipe. 1.If entire pipeline is filled with water, no leak and no supply, is pressure...

Lets say I have a superconducting pipe that is infinitely long. Now I place a magnet in the pipe, will the magnet stay placed in the pipe due to the meisner effect? And the magnet is in a Constant gravitational field. And the pipe is vertical in the G field.

Homework Statement I performed an experiment using a double pipe heat exchanger. Readings were taken at steady state. Cold water entered the inner tube at 9°C, and its exit temp was 81°C. (flow rate was measured). The outer tube contained steam at 133°C and this temperature remained...

Homework Statement Water flows in a pipe with speed 1.5 m/s at point 1. The diameter of the pipe at point 1 is 4cm and the diameter at point 2 is 3cm. density of water: 998.2071 kg/m^3 What's the speed of the water at point 2? Homework Equations I think you need to use this. I just have no...

Homework Statement see attachment Homework Equations not sure if these are applicable because i don't think its steady state anymore mass flow in=mass flow out sum of forces in x direction= rate of momentum in-rate of momentum out bernoulli's p+0.5ρ(v^2)= constant The Attempt at a...

Hi I cannot find an equation for a boundary layer in a pipe flow (laminar). I am looking for an equivalent of the equation δ(x)=4.91x/(√Re) that works for a flow between plates (x is the distance downstream). The thing is- I am looking for BL thickness for still undeveloped flow. I would be...

hi to everyone, i have the following question, see attached image. a vertical pipe containing water is exactly 28ft tall. at the top (A) the pipe is tight shut. at the bottom (B)the pipe is open and ends in a bowl of water. since no air can enter the pipe, the water remains within the pipe...

Homework Statement The speed of water flowing through the "influent" 4-inch diameter section of the piping system below is 3.0 ft/s. What is the volume flow rate of water in the piping system? Express the volume flow rate in ft^3/s Homework Equations The Attempt at a Solution I...

Homework Statement Water flows from a pipe at 650 L/min. a) What is the diameter of the pipe (in cm) of that pipe, if the water flows at 1.5 m/s? Homework Equations Q = V*A Now the equation for the area of a pipe is A = ∏r^2 The Attempt at a Solution Q = 650 L/min V =...