Flow Definition and 1000 Threads

  1. F

    Flow in Branch Pipe: Understanding Reservoir Flow Dynamics

    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
  2. Carter Green

    I What Forces Affect Liquid Flow in a Circular Pipe?

    Hi I am trying to understand what forces are at work to slow a liquid flowing in a circular pipe As an example the above torus pipe fully filled with an incompressible low viscosity liquid. This is rotated until the fluid achieves solid body rotation and then the pipe is suddenly stopped...
  3. Ecthe

    I Calculating gas flow trough a pipe and a nozzle

    Hello there. I am struggling with some gas flow calculations that, I think, should be quite basic. However, I think that I miss the knowledge background for it. I have a setup that I am showing in the attached file but here are more details: -I have a vacuum chamber pumped with a turbo pump to...
  4. F

    Can Water Flow in Multiple Directions in a Network of Pipes?

    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 ...
  5. SmritiB

    Detecting Current Flow in a Circuit with LEDs

    I am desgning a circuit(network), where i need to show the path traversed by the greater part of the current at each node, consecutively. using an ammeter (or voltmeter) in every branch (around 20) makes it too tedious. Will LEDs do the required work? But they would light up at all locations...
  6. F

    Calculating Oil Flow Rate in Cast Iron Pipe

    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)...
  7. S

    Volume flow rate variation of a free air jet

    Hi, I recently did an experiment whereby we investigated the velocity distribution of air expelled from a round nozzle whose diameter, D, was 30mm. We have been asked to calculate the volume flow rate at distances of 2D, 6D and 10D along the centreline. We found the flow rates to INCREASE...
  8. M

    Finding centerline speed of a flow through a nozzle

    Homework Statement Homework Equations u=a+ b(x-c)^2 We have two boundary conditions at x=0, u=u(entrance) and x=L, u=u(exit) Source: Fluid Mechanics by Çengel/Cimbala The Attempt at a Solution I cannot understand the parabolic equation in the x-direction.
  9. Basimalasi

    I Energy needed for achieving this mass flow rate for a rocket

    Hey, Suppose you have an enclosed vessel that is full of water. You heat it up then you open a valve, and that will create enough thrust for it to act as a rocket. How much energy is needed for a steam rocket to get heated enough to achieve a mass flow rate of 2430 Kg/s. Mass of water= 256...
  10. F

    Solving Pipe Flow: Understanding Why $\tau =\mu(-dV/dR)$

    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
  11. F

    Circuit Problem -- With only a battery in the circuit, will current flow?

    Homework Statement Will current flow in an ideal circuit given that there is only an ideal battery in the circuit? Homework Equations V=IR The Attempt at a Solution Since there is no resistance through out the circuit no potential is dropped so no current flows
  12. F

    Does a Drop in Energy Level Indicate Water Flow Direction?

    Homework Statement the energy level drop from point 1 to 2 , does it mean that the water flow from point 1 to 2 ? Homework EquationsThe Attempt at a Solution
  13. C

    Neutral Wire Current Direction and Magnitude in AC Power Distribution

    What determines the direction of current flow through the neutral wire? What determines the value of the current through the neutral wire?
  14. B

    Gas and liquid flow rates in Gas-liquid flow loop

    Homework Statement I'm working on my research project at uni, running a gas-liquid flow loop for horizontal stratified flow exhibiting wave propagation. The equipment I have however is setup to investigate vertical flow primarily and the flow meters are located on the vertical sections. I need...
  15. F

    What is the Correct Equation for Flow Rate?

    Homework Statement the equation of flow aret given is [(pi)((r_o)^4 ) / 8μ ] [-d/ds (ρ +yz ) ] , but the ans that i got is - [(pi)((r_o)^4 ) / 8μ ] [-d/ds (ρ +yz ) ] , what's wrong with my working ? Homework EquationsThe Attempt at a Solution
  16. F

    Resultant force at elbow from water flow

    Homework Statement water flows in an elbow was aligned horizontally , of angle 135 degree . If the water volume is section 1 and 2 is 0.2m^3 , the elbow is 12kg , flow rate is 0.4(m^3)/s , find the resultant force Homework EquationsThe Attempt at a Solution i found x and y component of the...
  17. F

    Understanding Flow in Branch Pipes: Exploring Q1=Q2+Q3 Concept

    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 ?
  18. M

    Velocity as a function of area in pipe flow

    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...
  19. F

    Explaining Water Flow: Inlet vs Outlet Pressure

    Homework Statement this is a pipe where the water flow from low to high. assuming no friction loss (volume rate are constant at both inlet and outlet) , is the pressure at inlet = pressure at outlet ? p/s : inlet and inlet diameter are same Homework EquationsThe Attempt at a Solution my...
  20. J

    The Pressure Distribution in a Narrowing Tube with Increasing Fluid Velocity

    Homework Statement Question: For a fluid flowing within a horizontal tube, if the diameter of the tube narrows, will the fluid's flow rate increase, resulting in increased pressure in the narrowing and explain your reasoning. Homework Equations Volume flow rate = volume/time Volume = Area x...
  21. N

    A Ricci Flow and Weyl Transformations

    I am trying to my head around these two things in the context of string theory. The Polyakov action becomes simpler to solve in the conformal gauge which, as I understand it, makes the manifold locally Ricci flat in 2D. In Professor Susskind's lectures on String Theory he introduces the concept...
  22. Max KL

    What is the needed flow rate of the impeller with this info?

    Hi everyone! As an experiment I am trying to calculate building my own PWC similar to a jetski assuming it is for sea level use. I really appreciate all detailed answers as I want to understand. The impeller will be installed under rear of craft, engine is mounted on top. Given Information...
  23. S

    Bernoulli's equation to find the flow rate

    Homework Statement " A horizontal water pipe has a radius of 10 cm and a pressure of 8*10^4 Pa at one end. At the other end the radius is 5 cm and the pressure is 6*10^4 Pa. What is the water flow rate through this pipe? Homework Equations P1 + 0.5 * ρ * v1^2 + h1ρg = P2 + 0.5 * ρ * v2^2 +...
  24. Israel Eydelson

    How do we simulate time flow in video games? EE/PHYS

    Hi Everyone, I am very ignorant and uneducated but I have a few questions about a difficult thought experiment. 'How does time flow in a video game/simulation or even in our imagination in relativistic terms?' Let's say a processor operating at 4.2 Ghz, 42 billion instructions per second at...
  25. K

    1 pipe branching into 3 pipes, pressure of each branch?

    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...
  26. S

    Plotting pressure distribution of fluid flow in a pipe

    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...
  27. G

    Max Flow / Min Cut (undirected graph)

    Homework Statement Here is an exercise I came across while studying MaxFlow / MinCut and I'm rather stumped: Designate G = (V, E) as an undirected graph that has at least two vertices. Every edge e on this graph has capacity ce. Pick two arbitrary vertices from G and label them s and t...
  28. D

    What is the relationship between viscosity and irrotationality in fluid flows?

    Hi, I am trying to clear the mess of the terms used in fluid mechanics and get a clearer relationship between them. So I have summarized in the table below the relationship between viscosity and irrotationality of fluid flows. Can somebody tell me if I got this right? Thanks.
  29. F

    Is Flow Rate in Open Channels Affected by Backpressure?

    Homework Statement I was told that the flow rate in open system at 2 points in the pipe system are not the same, is it true?? Homework EquationsThe Attempt at a Solution
  30. A

    How would the electrons flow in this case?

    Say you have a strong spherical magnet where the poles are along the Z axis, and this magnet is surrounded by a toroid of metal at the equator, if you spin this toroid very rapidly around the sphere in the θ direction (along the blue arrow, i.e it goes around the Z axis), how would the electrons...
  31. F

    Calculate Pressure Drop of Air Across an Opening

    How do I determine the pressure drop of air across an opening? For example if I have 3,000 L/s (3 m3/s) and an opening of 8.4 m2 I know the velocity is 0.4 m/s. If the free area is 80%, the velocity increases to 0.45 m/s. What I'd like to cal is the pressure drop in each case. Cheers
  32. T

    Flow Rate of a Liquid: Calculating Mass & Pressure

    (a) FIGURE 2 shows two cylindrical tanks interconnected with a pipe which has a valve that creates a constant resistance to flow of Rf when fully open. The height of liquid (of density ρ) in the first tank is hin and the second tank hout. The cross-sectional area of the first tank is Ain m^2 and...
  33. C

    Flow & Viscosity: Estimate Max Temp of Crude Oil for 4Kg/s Flow

    Homework Statement [/B] For many liquids the viscosity is strongly dependent on temperature. Use the table below to estimate the required maximum temperature of crude oil to flow at a rate of 4Kg s-1 through a 0.3 metre diameter pipe whilst maintaining a laminar flow. In the table it has in...
  34. dgd87

    How Much Gas Can Be Injected in a Rotative Gas Lift System?

    Hi Everyone, I work with rotative gas lift systems, sizing the compressors (recip´s), I'm not that familiar with the oil well, though. I have a doubt regarding the gas flow going to the well. There is a new well which currently produces 0.4 MMscfd of gas and the client wants the system to be...
  35. M

    Measuring flow rate (Doppler device)

    Hello, I am new in this field, so maybe my questions will be stupid :) sorry for that :) In the company where I work, they measure flow rates of wastewater using Flow meter (Doppler device). The problem is, that the flow rate is very low, so this device is not submerged completely in the...
  36. F

    Why Doesn't the Flow Rate Change When a Vane is Moving in a Pipe?

    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...
  37. M

    Rate of water flow experiment question

    Hi, I am mike from australia, I am new to the forums and am having trouble answering the question below, I have included some information on the experiment as well. You are given a water bottle with a pin sized hole in the bottom, and a line drawn around the bottle at the level that 50cm3 of...
  38. F

    Why is water unable to flow from A and B to C in a branching pipe system?

    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...
  39. y2j

    Automotive Temperature and mass flow rate of ICE exhaust gas

    Hi everyone I searched about the mass flow rates and temperatures of exhaust gases of light gasoline internal combustion engine at different condition but I don't fond anything yet . Anyone can guide me? .
  40. S

    Fluid Flow Equations With Real Values

    Hi, all I am working on a project that involves analyzing fluid flow behavior in oil & gas pipelines. I am interested in calculating and plotting the velocity profile, and also(pressure distribution, temp distribution) Having studies fluid mechanics last year I am aware of the EOS for fluid...
  41. L

    How does opening multiple valves affect the water flow through pipes?

    Homework Statement I'm going to regulate a tank using a PID-controller. I want to simulate this in MATLAB though and met a problem while calculating the mathematical model. The problem is the following: The three valves are either fully open or fully closed. The diameter in the pipes are all...
  42. F

    Energy Flow from Low to High: Exploring the Water Flow

    Homework Statement As we all know , energy will lose from high to low. in the equation , the energy at A ( Pa +za +](Va)^2 ]/2g ) is higher , while the energy at B is lower. So, why the water flow from B to A ? why not A to B ? 20.39 +10.52-hf = 32.98 Homework EquationsThe Attempt at a Solution
  43. S

    Current flow across inductors in Series

    I can't articulately ask the question so I drew a diagram. In the diagram, both capacitors are equal in capacitance. The bottom inductors are both 10000 nh and the top are 100 nh. A. Will the capacitors charge at the same time? B If we switch the large inductors to the top and the small to the...
  44. C

    Blasius Solution for Boundary Layer

    Is the Blasius solution valid for internal flow in an underdeveloped pipe? Can the function for the boundary layer thickness be used to calculate when the boundary layers will meet in the center of the pipe? I don't see how it could be valid since the assumption in its derivation is that...
  45. D

    Siphon Flow in Tanks: Will Water Go Up Hill?

    If we have 2 Tanks connected with a siphon but the water in bigger tank is higher than the water in smaller tank, but the siphon goes from smaller tank over to the big tank and ends up at lower elevation than it started. Will the water flow in big tank like in the picture.
  46. C

    Water flow through a perforated plate

    Hi, I'm seeking the formula to calculate how water moves from one tank into another through a perforated plate driven by waterlevel compensation. I found the calculation for the discharge of water through submerged orifices, but I think the calculation does not include that holes, one above the...
  47. T

    Solving for Air Speed in an Air Duct

    Homework Statement A 15 cm. radius cylindrical air duct is used to replenish the air of a room 10 m.*6 m.* 3m. Every 10 minutes. Determine the speed of the air through the duct in m/s. A1=15 V1=? A2=19 V2=0 Homework Equations A1V1=A2V2 The Attempt at a Solution 3.14*15^2 * ?= 19*0=...
  48. Neeps

    Sailboat rudder physics, and water flow estimate

    Hi. I'm a computer science student developing a kalman filter for autonomous sailboat, but I severely lack knowledge of the physics behind sailboats. I have a wind sensor giving data about wind speed and wind velocity, problem is the data is unreliable. So i thought that i could estimate what...
  49. T

    Calculate the required current flow in the suspended wire

    Homework Statement In the figure, the top wire is 1.5 mm diameter copper wire and is suspended in air due to the two magnetic forces from the bottom two wires. The current flow through the two bottom wires is 70 A in each. Calculate the required current flow in the suspended wire. Homework...
  50. kartmaze

    Steady State Flow out of a Tank Through a Vertical Pipe

    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...
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