What is Pipe: Definition and 1000 Discussions

A tobacco pipe, often called simply a pipe, is a device specifically made to smoke tobacco. It comprises a chamber (the bowl) for the tobacco from which a thin hollow stem (shank) emerges, ending in a mouthpiece. Pipes can range from very simple machine-made briar models to highly prized hand-made artisanal implements made by renowned pipemakers, which are often very expensive collector's items. Pipe smoking is the oldest known traditional form of tobacco smoking.

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  1. N

    An ideal fluid flows through a pipe with radius R with flow speed v

    An ideal fluid flows through a pipe with radius R with flow speed v. If the pipe splits up into three separate paths, each with radius (R/2), what is the flow speed through each of the paths? Would we just use the flow rate equation giving a flow speed of 4v in each of the paths? Does the...
  2. K

    350 Hz sound travels through air and metal pipe at different speeds.

    I stumbled on this question while studying sound waves today, and it has got me stumped. I've been thinking this through for hours, to no avail. It goes: A park has a circular fence with a metal pipe as the top rail. If the fence is hit with a hammer it produces a sound of 350 Hz. At a point...
  3. B

    Transient inviscid incompressible pipe flow

    Hello I am trying to better understand transient fluid dynamics in pipes. First, I am attempting what I believe should be relatively simple problem. I have a constant area horizontal pipe partially filled with a stationary incompressible inviscid fluid. The part of the pipe that is filled is...
  4. B

    Heat Transfer through a pipe

    I want to calculate the temperature on the outside of a pipe which has a heated fluid flowing through it. If I know the temperature of the fluid and the ambient temperature, as well as all the material properties such as thermal conductivity and convective heat transfer coefficient, is there a...
  5. B

    Choking in a Circular Orifice Plate in a pipe

    The equation I have for velocity through a circular orifice plater is as follows: Ud = \frac{Yi\timesC}{\sqrt{(1-(d/D)^4)}}\sqrt{\frac{(2\times(P_{2}-P_{1})}{\rho}} To my understanding, flow becomes choked when this velocity exceeds a Mach number of 1, and is no longer sub-sonic...
  6. V

    Calculate the torque required to rotate a pipe

    Hi, I am stuck on what should be a fairly simple problem. I need to calculate the torque required to rotate a pipe weighing 30 lbs resting on bearings at constant speed. How should my approach be? Do I need to actually measure the torque required using a sensor? Thanks, Mike
  7. Saladsamurai

    Calculate the Flux through the Pipe Part 2

    Homework Statement Okay, so this was Part 1: ... which I solved as follows: \phi=\int_{Surface} v \cdot da =\int_{Surface} v*da\cos\theta =\int_{Surface} v*da =\int_s\int_l v*(dsdl)=v*s*l Now this is Part 2: Figure 1.29 We slice the end of the pipe off at some angle \theta. This does...
  8. Saladsamurai

    Calculate the Flux through the Pipe

    Homework Statement Water flows with a speed v down a rectangular pipe of dimensions s and l as shown. What is the rate \Phi=volume\, per\, unit\, time at which water accumulates in the bucket? Homework Equations \Phi=\int_S\mathbf{v}\cdot d\mathbf{a} The Attempt at a...
  9. K

    Solving Pipe Line Failure in HP Compressor Setup

    As a part of my Project I'm experiencing a serious problem, "Blow out of Pipes in Compressor". In that we are trying control the blow out. Let me tell you the real scenario. The outlet of the HP Compressor is connected to a pipeline which in turn is connected to the reservoir. HP Outlet -...
  10. J

    An organ pipe is 84 cm long and at a temperature of 20 degrees C.

    Homework Statement An organ pipe is 84 cm long and at a temperature of 20 degrees C. What is the fundamental (in Hertz) if the pipe is closed at one end? Homework Equations To best honest, I'm not really to sure where to start. Can anyone please help? Start me off? Thanks in advance!
  11. H

    Fluid Flow in a Pipe: G-Greater, L-Less, E-Equal

    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 G-Greater than, L-Less than, or E-Equal to). A) P1 is ... P4 B) v1 is ... 2v3 C) P4 is ... P5...
  12. E

    Can Mass Flow Rate Determine Pipe Length?

    I have a mass flow rate, an area for the pipe and thus the diameter. I need to know the length of the pipe, but I end up with one equation and 2 unknowns. Is it possible to use the mass flow rate to somehow find the volume, which, in turn I can use to calculate the length? Or, any other...
  13. J

    How long to freeze standing water in steel pipe

    I posted this in another section and haven't receive any feedback so I thought I might have it in the wrong section. Thanks in advance for any help. I'm at little rusty on my heat transfer and could use some help. I'm trying to calculate the approximate time to freeze standing water in a...
  14. J

    Time to Freeze Standing Water in Steel Pipe

    I'm at little rusty on my heat transfer and could use some help. I'm trying to calculate the approximate time to freeze standing water in a 18inch steel pipe. I have some parameters and made some assumptions and they are: The pipe is 18inch carbon steel The standing water is initially...
  15. A

    Flow rates in a pipe system using the hazen williams formula

    I'm doing a project on flow rates in a pipe system using the hazen williams formula, does anyone know of a spread sheet or computer software that does this. I have been told that it is possible doing it in Microsoft Excel, does any know?
  16. D

    Can any man break off steel pipe by kicking?

    I've heard a saying that some fighters in blackmarket boxing could do this incredible thing. Is that true? Do you have any detailed proof of that? Aren't their legs made from protein?
  17. N

    Flow in a semi circular pipe

    Hi All: I am trying to calculate volumetris flow rate in a semi circular pipe with a fixed pressure but seem to have problems. I have calculated in a circular pipe as Q= (Pi (P1-P2) R^4)/8uL Can anyone comment on how to calculate for semi circular pipes? Regards
  18. D

    Calculate water pressure coming out of a pipe

    Hi there I have a 19mm pipe. I will measure the flowrate of the water by filling a known volume container and timing it. Is it possible from this information to work out the pressure of the water coming out in psi or something similar? Help appreciated. Thanks
  19. B

    Rotational Motion (thin hollow pipe)

    Homework Statement thin, hollow 60.0 g section of pipe of radius 14.0 cm starts rolling (from rest) down a 17.5° incline 5.60 m long. (a) If the pipe rolls without slipping, what will be its speed at the base of the incline? (b) What will be its total kinetic energy at the base of the...
  20. P

    Perforated Pipe Flow with a closed end

    1. A hydroponic garden uses the 10 m long perforated pipe system to deliver water at 20ºC. The pipe is 5cm in diameter and contains a circular hole every 20 cm. A pump delivers water at 75 kPa (gage) at the entrance, while the other end of the pipe is closed. pressure near the closed end of the...
  21. B

    Fluid with laminar flow going through a constriction in a pipe has low

    Hi What is the fundamental reason why a fluid with laminar flow going through a constriction in a pipe has lower pressure? Pressure is defined as force per unit area so the fluid particles must be hitting the pipe wall in the constriction with less force. Beetroot
  22. O

    How Does Pipe Expansion Affect Water Pressure?

    Homework Statement Water flows at 6.1 m/s in a horizontal pipe with a pressure of 3 ´ 104 N/m2. If the pipe widens to twice its original radius, what is the pressure in the wider section? Give answer in Pascals. Homework Equations volume = length x area rate = volume / time rate =...
  23. E

    Why does sound pitch change when flowing water temp does in pipe?

    I have always wondered why there is a noticeable change in the sound of water flowing from a pipe when the water temperature changes. When I first turn on the hot water faucet after a long period of being off, there is a steady pitch of sound I hear. I am referring not to the sound of the water...
  24. K

    How Does Helium Affect the Fundamental Frequency of an Organ Pipe?

    Homework Statement A certain organ pipe, open at both ends, produces a fundamental frequency of 291 Hz in air. If the pipe is filled with helium at the same temperature, what fundamental frequency fHe will it produce? Take the molar mass of air to be 28.8 g/mol and the molar mass of helium...
  25. O

    What Are Some Optimal Pipe Diameter Solutions for a Dual-Valve Fluid System?

    Hey guys, I am studying in heriot watt university Dubai. I would like to be a Fluids expert. I have been doing well in my course-works and my professor usually helps me around to get a few extra info. However recently due to a tight schedule he is unable to help me out. I have managed to...
  26. P

    Resonance ans normal modes in an open pipe

    Hello, I have a question about standing sound waves in an open pipe caused by a speaker, I know that normal mode frequencies are given by f_n = n\frac{v}{4L}, \quad n=1,2,3,... if we put a microphone into the pipe, and if the frequency of the speaker is a normal mode frequency, we see...
  27. E

    Calculating Acceleration Rate in a Decreasing Pipe

    Homework Statement A pipe is designed to have its cross sectional area decreasing linearly from 12-inch diameter to 6-inch diameter. What is the acceleration rate at a section 10 inches from the ending section of 12-inch pipe at time = 3 sec? The volume flow rate Q=2t cfs (note: t is in sec)...
  28. K

    How to calculate cfm through pipe

    I work at a cement distribution terminal. We load bulk powdered cement pneumatically into ships. Part of this operation is to remove the excess air from the ship by use of dust collectors. I need to know if my dust collectors are pulling enough cfm to keep up with the total cfm going into the...
  29. W

    Storage reservoir is continuously filled through a pipe

    Homework Statement A storage reservoir is continuously filled through a pipe delivering 2.2cfs. The reservoir is circular in shape with a diameter of 20 ft. The height of the tank is 12ft. A pump operates for the last 5 minutes of successive 20 minute intervals, draining out 350 cubic feet of...
  30. S

    How to calculate header pipe length

    Hey guys n gals, Looking for a little help here. I am looking to build an equal length header for my truck and was wondering how to calculate the losses through the amount of 45, 60, 90 and 180deg bends for 1.5 sch.40 pipe. Now, for clarity, I do NOT mean equal centerline length, that's easy...
  31. C

    Organ Pipe Research: Is 16ft Open-Top Flue Open at Bottom?

    Hi can anyone help me? I am researching into organ pipes, and dealing with a flue organ pipe that is 16ft long and open at the top, my conundrum is: is the organ pipe open at the bottom where the air flow enters? i can find no definitive answers, can anyone help/send me a link? thanks
  32. 5

    Fluid Mechanics - Split Pipe Flow Question (momentum and Bernoulli eqns)

    Hi, I am stuck on this question as I haven't encountered anything similar to it. Normally I have only dealt with pipe with one inlet/outlet. Homework Statement I am given a diagram of the pipe shown on the attachment (Sorry for the crude diagram). Hosted it while the attachment is "reviewed"...
  33. W

    Calculating the hydrodynamic entry length of a cicular pipe.

    Does anyone know how to calculate the entry region length of laminar incompressible flow in a pipe? There are several formulae available which give a ratio of the (entry length)/(pipe diameter)/(Reynolds number) = 0.02-0.06. I'm not looking for the final solution, but rather the approach...
  34. Topher925

    The chevy volt, pipe dream or a viable solution?

    The new chevy volt design was unveiled today: http://news.yahoo.com/s/ap/20080916/ap_on_bi_ge/gm_centennial;_ylt=AuVoT6aLIov8pyZGWNXsNjxsaMYA" There's a lot of controversy over this car in the engineering world. Since its being developed right in my neighborhood I hear a lot about its...
  35. E

    Fluid Drag on a wire inside of a pipe

    Hi Folks, How would one go about calculating the drag force that would be applied to a wire (or in our case a small (0.130") fiber optic cable, that is inside of a small diameter pipe (.56")? I've tried several methods, but none seem to match what we actually measure when experimenting. We...
  36. T

    Nominal Pipe Size and Diametre Nominal

    I'm wondering about the the term 'Diametre Nominal', or 'NPS' as it's called in the US. I've realized that pipes that are identified by "nominal" names are only loosely related to the actual dimensions. For instance, a 2-inch galvanized steel pipe has an inside diameter of about 2 1/8 inches and...
  37. T

    What is the maximum CFM through a pipe in the rock drilling industry?

    I am in he rock drilling industry and I am looking for a formula to be able to calculate what the maximum CFM is through a pipe. For example I have a 0.5” dia. pipe, 600CFM @ 150psi compressor. What is going to be the actual CFM that I will get at the end of a pipe? Any help will be greatly...
  38. C

    Estimate the velocity and angular velocity of an empty pipe

    Hi, I need to resit some exams and I'v been having difficulty trying to solve this problem. Estimate the velocity and angular velocity of an empty pipe of mass (m)=1000kg, Diameter (d)=10mm, shell thickness (h)=1mm at the bottom of a slope of angle \theta=45^{}o and path length L=5000mm on...
  39. Y

    Organ Pipe and Fundamental Frequency

    Homework Statement The organ pipe is 2.0 m long, was open at both ends, and was originally tuned to a fundamental frequency of 128 Hz (C below middle C). a) what is the wavelength of the fundamental? b)if the note you now hear is closer to 262 Hz (middle C), where is the blockage with...
  40. S

    Open and Closed Pipe Length for Harmonics

    Homework Statement a pipe in air at 20 degrees celsius ia to be designed to produce two succesive harmonics at 240Hz & 280Hz. how long must the pipe be, and is it open or closed? Homework Equations v=\lambdaf The Attempt at a Solution sorry, i could not do it. i totally can't...
  41. B

    Shear Strength of an Erected Pipe

    Does anyone know how to determine what size/type of pipe/tubing would be necessary to withstand given wind speeds? Specifically, I'm wanting to build a "megatree", an outdoor Christmas tree made simply by stringing lights from the top to the bottom in a conical shape. I'd like a 20' + tree...
  42. T

    Diameter diff between flow pipe and component connector

    So many places I've seen components (fancoils and such) with inlets that are let's say 1", but where the pipe leading up it is maybe 1 1/2". Does that make any sense at all? Can pressure drop have something to do with it?
  43. G

    Optimizing Water Flow in a Vertical Pipe: Calculating Pressure and Speed

    Through a pipe 15.0cm in diameter, water is pumped from the Colorado River up to Grand Canyon Village, located on the rim of the canyon. The river is at an elevation of 564m, and the village is at an elevation of 2096m (a) What is the minimum pressure at which the water must be pumped if it is...
  44. D

    Thermodynamics Change in Gas Temperature along pipe

    Homework Statement Nitrogen beginning at 50oC is pumped along a 30m length of Stainless Steel pipe at a flow rate of 1.5 litres per minute. The Pipeline is at ambient temperature 20oC. Find the temperature of the Nitrogen upon it leaving the end of the pipeline. Pipe OD - 0.00635m Pipe...
  45. D

    Temperature of Nitrogen in a Pipe

    Hi, i am on work experience and they have given me a short task which is sort of the next step up from work i have done previously. Can anyone help me with the following:- Vessel containing nitrogen at 50 oC Nitrogen is pumped along a 30m length of pipe at a flow rate of 1.5 litres per...
  46. R

    Pressure vessel and resulting flow through a pipe

    Hi everybody, I've been going around in circles with this problem and not sure if I'm approaching it correctly. I have a vessel filled with a fluid and connected to a pipe (circular cross section) with a tap on the end. The pressure on the vessel is not atmospheric, it is about 1 bar...
  47. D

    3D Points on Surface of a Pipe (Disk)

    Hello to all...first post here! I need to compute 3D (x,y,z) points around the surface of a pipe. By pipe I mean something like an underground pipeline. Let's say I'm given the bottom point of the pipe in x,y,z coordinates, the diameter of the pipe (say 12 feet), and the inclination or...
  48. E

    Formula to Calculate drop Pressure in Liquid Pipe

    I am looking formula to calculate pressure drop in a liquid pipe and to determine a suitable diameter of pipe to use for the application.
  49. L

    Calculate Pressure in Fluid Motion Pipe with Bernoulli's Principle

    hi, I am just assumin this is the right place for bernoulli stuff pressure 1 and 2 are both static pressures, and the arrow shows fluid motion is it possible to calculate them directly from an equation? or is it simply P1 and P2? and also, since the diameter decreases for P2, the...
  50. S

    Forcing water from a pipe underwater

    Hi I have a problem beyond my scope. I am not a lerned physics chap so please, any answers would be great if kept simple :) I have a pipe containing 300 litres of water. The pipe is 346mm diameter and 1 meter long. The top edge of the pipe is 1200mm under the sea. The pipe lies...
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