Pipe Definition and 1000 Threads

I have a length of pipe where air is being pulled through by a high powered fan at one end. The pipe is stainless steel, outer diameter is 100 inches. the thickness is 0.125 inches. I need to know what is the minimum vacuum pressure inside the pipe can be before the atmospheric pressure will...

I am a little unsure how to get started with a homework question. Essentially, I have to calculate the local heat flux at a distance 1.2m (x) along a pipe. I have the fluid's properties and have calculated the Reynolds number, for which I've determined the flow to be turbulent and therefore do...

I have a pipe holding liquid at 80°C. The outside atmosphere is -2°C. The pipe gets a temperature gradient over the wall thickness. The outside fibers will thus restrain the inner fibers from expanding. I would like to know the increase in the inner dia of the pipe. I have found temperature...

I learned about Tesla's valve and how, without moving parts, it wouldn't be useful enough. But my question is, can I make a pipe with the valve's structure, and only apply heat in order to create flow. I know things follow the path of least resistance, and with a constant addition of heat, I'm...

Hello All, I have a question for heat exchange calculation and hope someone can help. I would like to recover the "cooling energy" from a ice melting pool for air-conditioning for a small office. I plan to install three fan coil units with 800CFM for the office with closed loop water pipe to...

Hi boneh3ad Your discussion on Bernoulli Equation was very impressive and helped me a lot to understand this rather complicated equation. I have a question which puzzles me a lot when I want to solve it using Bernoulli equation. Here is the statement. " If there is some fluid flowing thru a...

Hi. There's this nice water circuit model for electric circuits where pressure corresponds to electric potential and the (mass or volume) flow rate to electric current. In the water model, we can vary the pipe diameter along the circuit. Since water is practically incompressible, the flow rate...

Homework Statement A pipe 30 cm in diameter and 420 m long has a wall thickness of 1 cm. The pipe is commercial steel (ks = 0.045 mm) and carries water from a reservoir to an elevation 100 m below the bottom of the reservoir and discharges into the air. A rotary valve is installed at the...

Suppose I have an air pipe that is used for "grasping" other objects using negative pressure. When an object is grasped, assume it is a perfect seal and that end of the pipe is closed. On the other end of the pipe is the pressure source creating the vacuum. Somewhere in the middle is a short...

Hi everyone, I'm sorry if it sounds dumb but I'm struggling here trying to understand how to increase the pressure in a pipe using an air compressor. I wasn't able to find information for this really basic engineering problem, so hope you guys could help me. Basically, the idea here is to...

Homework Statement (This is more of a discussion question) [/B] My question is, if we have a pipe between two reservoir A and reservoir B (Height of A > height of B) , then if flow in the pipe is to happen from A to B, what sign would the pressure sign be at any point in the pipe? Homework...

Hi everyone. My dad was debating with his friends over something, and he asked me for my opinion too. I've been on these forums before so I thought I'd ask here. So let's say you have two pipes. Both have the same cross-sectional area, same fluid inside, and they both extend to the same height...

I was just wondering is there any way to calculate what the airspeed would be, inside of a pipe with a known diameter and length, that lay with each end exposed to a known, different pressue than the other. Was wondering if such a set up would be feasible for generating clean electricity by...

Hi, I need to figure out how much weight a 5 foot steel pipe will support before becoming unsafe. I am building a series of out door pull up bars for my neighborhood as an eagle project. I need to buy the right pipe/tube that will be sturdy enough but not have too big of a diameter that you...

Hello, I'm a bit rusty with my fluid mechanics and can't seem to find the answer anywhere. Basically I have a pressure wave traveling in a liquid at the speed of sound through a pipe of the shape shown in the attachment (basically a semicircle of constant cross sectional area and then a cone of...

In the gas industry engineers often have to purge gas pipes. For example, if repair work must be done on a gas line the fuel gas in the system must be removed before work can be done safely. The Institute of Gas Engineers and Managers (IGEM) publication IGE/UP/1 stresses the need to achieve a...

why does the pressure drop equation derived for the laminar flow has no parameter to indicate the surface roughness of the material of the pipe,unlike the turbulent flow !

I have a shaft within a pipe, all horizontal. Shaft diameter is 2.875" and pipe inner diameter is 5". Shaft and pipe length is 650 ft. Shaft weight is 2500 lb. I need to determine the torque needed to begin rotating the shaft. The coefficient of static friction between the shaft and the pipe is...

Homework Statement Problem data:[/B] http://imgur.com/a/hEz16 Homework Equations Rconduction=ln(rout/rin)/2*pi*Length*thermal conduct Rconvection=1/2*pi*Length*routside*convective heat transfer outside =>Qconduct=2*pi*Length*thermal conduct*(Tin-Tout)/ln(rout/rin)...

In tube end forming practices, is it possible to first reduce the diameter of the pipe (tube 0.9mm thick) and then expand it, at the same end, by about 1mm in total, with a transistion radius of 8mm ? Please see attached image. Though it might be exaggerated, but the image should suffice. I want...

Homework Statement An organ pipe is 2.5 m long and has a cross-sectional area of 30 cm^2. The pipe is open at one end and closed at the other. The equation of the displacement s of an air molecule from its equilibrium position is s=(0.5 cm) sin (pi x) cos (900pi t) where x is the distance from...

Hi guys, I need help with heat transfer calculations The scenario is : Installing a coil around a hot pipe and extract the heat from the hot pipe to heat the fluid flowing through the coil. The whole assembly is insulated. I need methods/formulas to calculate the amount of heat transferred so...

Guys...need a little help Given Internal fluid Pressure P (Not Pressure Drop) flow rate Q Length Assume all the required parameters like viscosity, fluid density, temperature of the fluid, surface roughness and all losses (both major and minor) etc... I need to find the internal diameter of...

Hello! Please help me understand whether I'm going to the right direction with the solution or partially wrong or completely wrong. I have a basic Fluid Mechanics course at the uni, the following problem is from a past exam my teacher gave us to practice before the exam, so there're no answers...

Homework Statement .The pipe bender consists of two grooved pulleys mounted and free to turn on a fixed frame. The pipe is bent into the shape shown by a force P=300N.Calculate the forces supported by the bearings of the pulleys.[/B] Homework Equations The force equilibrium equations in two...

Homework Statement Homework Equations https://wikimedia.org/api/rest_v1/media/math/render/svg/1a061d2667e5d9f69dc385e359e7260a3eb1deff https://wikimedia.org/api/rest_v1/media/math/render/svg/ba88069934aa8abb2a2466f84121f385e6e8971f The Attempt at a Solution I have solved equation for r(t) and...

I would like to ask you that why pressure drop is constant through pipe? How can we know that dP/dx=constant? Thank you.

Homework Statement A 500N force is applied to the handle at point F. The geometry & measurements are as given in the illustration. Find Cx, Cy, Ax and Ay[/B]Homework Equations Well, the 500N force produces a 200Nm torque at point D, since DF is 400mm. [/B]The Attempt at a Solution So the...

Homework Statement How far will water shoot from a hole in a pipe knowing the pipe pressure, hole size, and exit liquid velocity and flow rate. It is assumed that the hole is located such that the water is sprayed at a 45 deg angle from the horizontal. Homework Equations Basic projectile...

Homework Statement [/B] in this question , the Pressure at entrance is not given , how to do this? Homework EquationsThe Attempt at a Solution does the author mean the pressure at entrance = pressure at exit

Homework Statement A pipe diameter changes from 0.5m to 1m in a length of 1m in a pipe diffuser . If a discharge Q flows from 0.5m diameter towards 1m diamater , obtain the general expression for velocity at the pipe cross section . Homework EquationsThe Attempt at a Solution since we know...

Homework Statement Homework Equations N/A The Attempt at a Solution Usually we are given a table, but how do we calculate the loss coefficient between 2 different pipes with different diameters? In this case, between the 5 and the 3 cm^2 pipes?

Homework Statement The following image shows the parts A and B of a pipe where the middle part goes under a hill the length of both parts A and B is 30m and the diameter of them each is 2cm where as the middle part has a length of 110m to determine the middle part's diameter one engineer...

please i need to know how to calculate power needed to bend 16" pipe with wall thickness 8mm long 6m by roll bending

Homework Statement in the solution , the author gave that volume flow rate = delta P - (rho)(g)(L sin theta) , IMO , it's wrong ... Homework EquationsThe Attempt at a Solution it should be P1 - (rho)(g)(L sin theta) , where (rho)(g)(L) = P2 , correct me if i am wrong . i think so because i...

Homework Statement why the author use major loss due to fluid friction is fL(Q^2) / 3(d^5) ? according to darcy weisbech , the major loss due to friction has the formula of fL(v^2) / 2gD why the author wrote it as fL(Q^2) / 3(d^5) ? I don't understand Homework EquationsThe Attempt at a...

Homework Statement the major loss in the fluid due to pipe friction is f(L)(v^2) / 2gD , (darcy weisbech equation) why the author use 4fL(V^2) / 2gD ? in the equation ? is it wrong ? Homework EquationsThe Attempt at a Solution

Homework Statement A large tube filled with an ideal gas at pressure p1 and temperature T1 has a small break in it towards an envirronement at p2, with p1 much larger than p2. What is the flow rate through the hole to the outside of the tube. Homework Equations pv=rT Δh+Δc2/2=δq-δl h1 + c12 =...

If I a pump with a main suction header and 4 smaller branch connections of difference sizes. Let's say for this example we have (2) 3", (1) 1", and (1) 2". Also let's say our pump is requiring 20 gal/min. The flow rate of each branch would be proportional to the area of the pipe correct? flow =...

Hi. I am stuck on a project on calculation of heat convection transfer coefficient for a annular finned pipe. All parameters [Diameter of pipe, diameter of fins for each case, the distance between fins, fin thickness, pipe length and fin number] are determined. And I have two book Fundamentals...

Hey guys, I am doing an internship and I have had some thoughts about fluid flow that have come up and I am having trouble fully grasping some concepts due to no one being able to thoroughly explain any answer that they might come up with. So I have a crude understanding of some fluid dynamics...

Homework Statement I know that when the fluid flow from pipe to reservoir, the coefficient of discahrge is 1, where head loss =k(v^2)/2g... How about the fluid is discharged from pipe to atmosphere?? Homework EquationsThe Attempt at a Solution

Homework Statement water flows from flow tank at A through cat iron pipeline to free surface at B . Given friction factor , f = 0.023, kinematic viscosity = 1.02 x10^-6 (m^2 0 /s , coefficient of losses for entrance , bend , valve = 0.5 , 0.9 and 10 . [/B] in this question , i am asked to find...

Good day to you all, some of you may be able to help me with my problem. So I have a flat roof and I have a pipe that goes from the roof to the ground and it drains all the water. I want to extend the pipe to a rain barrel, so I can use it for the garden. The rain barrel has an opening at the...

Hi everyone! I have the following problem. I have a two phase flow in a circular pipe and I want to model it. I need to decide and justify whether the model should be 2D or 3D. For the moment, I can say only one thing: considering z-axis in the length direction (that it is the dominant one) I...

I have a DIY project for a lawn sprinkler system but my flow rate is insufficient : if my setup is to work properly, the sprinkler manufacturer suggests a flow rate of 2880 litres per hour at a pressure no less than 2 psi. I measured the flow rate of my current garden faucet, which is connected...

Homework Statement [/B] A pressurized cylindrical tank, 5m in diameter, contains water which emerges from the pipe at point C with a velocity of 25 m/s. Point A is 10m above point B and point C is 3m above point B. The area of the pipe at point B is 0.07 m2 and the pipe narrows to an area of...

Homework Statement in the notes , the author stated that the water from reservoir 1 could flow to reservoir 2 and 3 ... i don't understand how could the water flow from 1 to 2 through junction D ? how could the water flow from low to high ? Homework EquationsThe Attempt at a Solution

Homework Statement we know that the formula of head loss is k(V^2) /2g , the k = 1 when the water is discharged from pipe to reservoir ...However , how if the water from pipe is released into atmosphere ? is it necessary to include the head loss due to exit ? if so , is the k still =1 ? in the...

Hi, I study linear momentum. But I cannot understand enough that how can forces appear on a pipe when fluid flows in the pipe? Fluid have a momentum as m*v how can forces appear on the pipe. I cannot demonstrate the situation in my mind. How can I find a demonstration or a free body diagram for...