Pipe Definition and 1000 Threads

Here's something simple but also a bit puzzling, let me know if you have any ideas... For clarity, I'll describe three cases before asking the final question (skip ahead if you like). 1. Mounted on a disk are two curved fences, just a few centimetres apart from each other. Between the fences...

Hi guys, Right, here is the situation. Consider a long coil of pipe containing water with a thermostatic valve at the outlet and a valve (this is the valve in question) at the inlet. The inlet is gravity fed by a large reservoir of water and the question is this: as the water leaves the...

To keep it simple: I have a vertical 60 foot drop. I want to create the maximum P.S.I. at the bottom of the pipe possible to run a water wheel or a turbine. If the bottom hole (say 2") and the vertical drop of two pipes is the same will there be a difference in a 4" or a 2" pipe? Note: there...

What I'm trying to do is compare pipe to channel as far as lateral strength. I have just received a patent, 7,707,794. It's for a building system of walls, fences, and buildings using steel channels and pipe posts. The current way to build a high security fence using expanded metal panels...

I want to build a small geothermal cooling unit to cool one small room in my house. If i lay 0.5" pex pipe which is 0.475" ID. The big question is how long does the water flowing in the pex tubing have to stay under ground. Constant ground temperature is about 55 degrees F around my house. I...

Homework Statement I am having trouble with calculating the required pump pressure in a horizontal water pipe, 3Km long. i know that the flowrate is 600Kg/s, average velocity 5.6m/s, cross-sectional area of pipe is 0.107143m^2 and losses due to friction average 0.002 per meter Homework...

Hi, This is my first thread related to an idea I have been working on and I would really appreciate some help. My education goes no further than high school, so I am doing my best. I apologize if I am doing this completely incorrectly. I am truly trying to do my best. To understand...

Hello. May I ask if we have the technology to run a thread-making machine on the end of that 20" pipe in the Gulf leaking oil and then screw a 20" cap on it? Is there even a commercially-available 20" threader? Largest I've seen is 6". Granted the oil pressure would initially prevent...

hi We all know when velocity of fluid increases then cross section decreases for same mass flow rate and this can be well seen at water flowing from a height as in waterfalls. But why this doesn't happen when water flows down through a vertical held pipe of constant cross section. Well you may...

I was wondering if anyone could provide me with some info on a problem I am facing. I have a pipe of 10m and 16" diameter. It has steam flowing through it, and due to inaccurate desuperheating we have a difference of temperatures at the bottom at top of the pipe. Assuming we have a...

Homework Statement Water (η = 1.00E-3 Pa*s) is flowing through a horizontal pipe with a volume flow rate of 0.0121 m3/s. As the figure below shows, there are two vertical tubes that project from the pipe. Assume that H = 0.0424 m and L = 0.679 m. Homework Equations No idea how to...

Hi, literally trying on the off chance that someone could help me. basically doing an individual project in my third year at nottingham uni. Over the last 6 months I've built a pipe rig to measure the pressure drop over a test section. Now my tutor is a bit of an idiot, and said the way i...

Hello, I'm looking to experiment with an Electrothermal-Chemical (ETC) system of accelerating a projectile. Basically, it will involve using energetic materials and large amounts of electrical power to create very high pressures inside of a tube in a very short amount of time, behind the...

If we have an open pipe system that will deliver in total 200 gpm divided in 2 pipes the first pipe is 50 gpm and the second is 150 gpm , the 2 pipes have the same length , if we want to size the pipes where both pipes will have the same diameter , if we do that through william hazen equation...

Hello All, I've frequented this forum for various purposes and this is the first time I've decided to post! Hopefully I can find the help or conformation I'm looking for. I may not have all the necessary info, but I feel this is basic enough that I should be able to come up with an...

I have to draw frequency on an open and closed pipe. The top horizontal row is open organ pipe and the second horizontal row is a closed pipe. I have draw the frequency of sound on these but the open entrance of the sound is what is confusing me. Are these correct?

I am trying to predict the temperature of water coming out of a pipe. I know the temperature of the water going into the pipe. I know the material and characterisitics of the pipe. I know the ambient air temperature. I have explored Fourier's Heat Conduction \mbox {\Huge Q= $\frac {2...

Homework Statement Water with pressure of 120 kPa is flowing through a rectangular pipe with velocity 1.9 m/s. At one point, the pipe narrows to one half of its original diameter. What is the velocity of the water at this narrower point? What is the pressure? Homework Equations v1A1 =...

Homework Statement The book I am reading just randomly states that the axial velocity for a fully developed laminar flow in a pipe is vx=2*u*(1-r^2/ro^2). i am not sure where this comes from. does come from the navier stokes equations? also, is there a book that lists other types of axial...

Hi, I'm trying to calculate the max (von Mises) stress in a 90o pipe bend. Now I know (I think) how to do it for a straight pipe, but can anyone point me in the right direction as to where I can find this analysis for a pipe bend? Thanks in advance.

Hello, Am the owner of a 90 acre man made lake and am trying to calculate the flow out of 12 inch pipe at the bottom of the lake. The lake is approximately 10 feet deep. Can someone point me in the right direction on how to solve this question?

Homework Statement Part 1: A liquid of density 1392 kg/m3 flows with speed 1.94m/s into a pipe of diameter 0.28m. The diameter of the pipe decreases to 0.05m at its exit end. The exit end of the pipe is 4.2 m lower than the entrance of the pipe, and the pressure at the exit of the pipe is 1.4...

So confused about standing waves in a closed pipe, which is open at one end and closed at the other. The closed end has a node while the open end has an antinode. To figure the wavelength, i use the formula: Lambda = 4L/n where n is the number of harmonic and can only be odd integers...

Homework Statement Use the picture as a guide. P is the pressure in the pipe, and vi is the speed of a non-viscous incompressible fluid at locations i = 1,2,3,4,5.(For each statement select correctly)...

Consider a pipe closed at one end and open at the other.a simple model tells that resonance will occurs when the sound wavelength of the resonator is 1/4,3/4,5/4.. of pipe length,by assumption that antinode occurs at the open end.But it comes out that the air at open end isn't completely...

Homework Statement Hot CO₂ gas enters a pipe at pressure P₁ and exits at atmospheric pressure (P₂ = 1 bar) and T₂ = 0°C. The pipe has a constant diameter D = 1 cm. The input temperature is T₁ = 100°C and the mass flow rate ṁ = 0.5 g/min. There is a significant change in mechanical energy due...

what suitable electric motor for create bending pipe machine?. could you give me the idea how to create the machine and easier for the user to use for bending pipe line?

This may be an elementary question, but I am still in the elementary stages of physics. My question is this: if you have a 4" fan at the end of a 4" pipe which is sucking air through the pipe, and the pipe narrows to 3" about 24" from the fan, does the 24" section of 4" pipe experience a vacuum...

In my fluid mechanics class, we did an experiment where we were asked to measure some values and then, using a Moody Diagram, estimate the roughness of the pipe. Briefly, each trial consisted of allowing water to flow down a thin tube (diameter D=9.5mm) and into a discharge cylinder. A manometer...

Need urgent help: Flow through a pipe hi guys. i have a long question. first read the attachment to understand part A. part A To simplify the flow, we need to use POLAR COORDINATES CYLINDRICAL navier stokes equation and continuity equation. the energy equation can be ignored. first we...

This isn't actually a homework/coursework question, but rather a need to clarify a discepancy between my lecturer's notes and a textbook. My lecturer's notes state that for an "organ" pipe, closed at one end, the 1st harmonic frequency will be 4L. For the 2nd harmonic the frequency will be...

Hi people. Please explain me, why in a horisontal pipe (closed) a bubble go to middle, and not stay in any other position? Also what is the difference of forces when this bubble moves from right/left to middle and when it rise from bottom to top. I know bubble rise due to buoyancy...

Hi all, can someone please tell me what are the advantages of using a trunnion pipe support? I guess that since it is welded on the pipe, it will prevent pipe movements in any directions, but then why would you use a trunnion instead of an anchor? Thank you!

How could I determine the length of a pipe by playing a certain frequency into it, then measuring how long the echo is audible?

I am working on a problem involving heat transfer from a horizontal pipe in air. I am having trouble with it and not getting the solution I expect, and I think it is because of the convection component of the heat transfer. The general formula I am following for convection from a horizontal pipe...

Hi all - I would like to add a periodic inlet flow rate (Q(t) over an entire period T) as a BC in COMSOL. Does anyone know how to do this in 2D axisymmetric Transient Navier Stokes through COMSOL? I'm aware of the periodic boundary condition option available, but really just don't know how to...

the bemoulli equation states that the energy per unit weight for a frictionless slow is constant. water at: 30degree c = 0.801kgm-1s-1 80degree c = 0.357kgm-1s-1 Radiator 15kw delta T= 5degree c cp = 4.2kj/kgk pipe diameter 40mm is the flow in the pipe laminar or turbulent at 30...

Hello guys, I need to model a pipe in modelica. Now modelica has its own fluid library where i can find a model of a pipe. But i need to model a pipe which has unequal inlet and outlet area. The outlet of the pipe is smaller than the inlet. Since mass going in the pipe=mass going out, hence...

1. Water is flowing in a pipe from a tank to a nozzle. At some point (A) the pipe tapers from 160 mm diameter to 80 mm at point B over a certain length. Point A is 3 m above point B. The pressure at A is 100kPa and at B is 20kPa, both measured above the atmospheric pressure. The flow rate is...

Hi, I want to know how high the flow rate trough a pipe is (outlet), but I only now the pressure difference (0.7MPa or 7 bar), and the diameter of the pipe. At what speed (or for that matter volume) does air leave a pipe when the pressure difference is 7 bar, and the diameter is 25.4mm...

Dear all, I want to make a vertical line in table.. I use this following latex codes \begin{table}[h] \caption{Some caption.}\label{namelab} \vspace{2mm} \centering \begin{tabular}[width=1\textwidth]{ll|cccc} \hline\hline \multicolumn{2}{c}{2~col} & par~1 & par~2 & par~3 & par~4\\...

Fluid problems - " pipe " like questions Homework Statement A fireman climbs a 8 m high ladder carrying a 5 in diameter hose that has a 1.4 in diameter nozzle. The pump has an absolute pressure of 4 atm. What is the water velocity from the nozzle? Assume that water is incompressible, its...

Hi all, if you have very pure oxygen (+99%) in your pipeline. HOW does the velocity of the oxygen causes fire in the pipeline? Thanks!

Homework Statement Two dimensional, incompressible flow with constant properties in entry region of a horizontal pipe. Assume no swirl, neglect heat transfer. Determine governing equations. Question is: what are the properties of the entrance region of a pipe as far as flow is concerned...

Homework Statement Water flows at 7 m/s in a pipe of radius 5 cm. A plate having an area equal to the cross-sectional area of the pipe is suddenly inserted to stop the flow. Find the force exerted on the plate. Take the speed of sound in water to be 1.4 km/s. (Hint: When the plate is...

I’m an entrepreneur in South Africa with the rights to a type of insulating coating. It’s new on the market here and no real research and development has been done on the coating to determine how much energy it can save. I’m a marketer and I don’t have the educational background to answer this...

Homework Statement The 810 mile long alaskan pipeline has a capacity of 2.48e5 m^3/day of oil per day. Along most the pipeline the radius is 60cm. Find the pressure at a point where the pipe has a 30cm radius. Take the pressure in the section with radius 60cm to be 190kPa and the density of...

Hi all, I am currently working on a water pipeline project and am investigating a pipe burst scenario at a pump station with the aim of producing a flow rate entering the pump room in the event of a burst. For simplification and what has been used previously on similar jobs is to model...

Hi, Which equation should i be using to find the pressure drop across a channel. I know the length of the channel, the hydraulic diameter and the reynolds' number. Thank you

What is the equation to estimate the turbulence kinetic energy per unit volume in pipe flow? Any information is appreciated. Thanks.