Flow Definition and 1000 Threads

I'm trying to figure a range of flows of coolant that will pull 200,000 Joules per minute from a heat exchanger cooling oil. The oil is passing through a head that adds 200,000 Joules per minute to 0.5 L / min. The 0.5 L is dumped into a sump with ~7 gallons of oil. The oil then passes...

hello! i was provided by the radii from 0 to 5 cm and a parabolic profile is also given .. in numeric form i was asked to calculate the flow rate how to understand it to solve further kindly help ...

For an airflow experiencing a large heat transfer, say a delta of ~600 degrees celsius, I assume compressible effects cannot be ignored. I am struggling however with some conceptual elements, such as how the pressure gradient changes along the flow when compared with compressible and inviscid...

Hi guys, First post on this forum. Greetings from the Netherlands :) I am currently in the process of designing a turbine used in locks in several canals. The turbine is powered when the lock chamber is being emptyed during the lockage. The goal is to calculate the water level in the lock...

Guys...Can anyone explain me why fluid accelerates and then decelerates when flowing over a convex surface and also concept of flow attachment in simple terms

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 =...

I'm currently studying the Landau-Wilson model for critical phenomena (Statistical Mechanics, Kerson Huang) where the renormalization group is a central object. In the end, the calculations lead to a set of coupled differential equations that describe the (metaphorical) evolution of the...

I guess there would be no flow in case 2; case 3 seems easy to me applying fluid mechanics principle; flow will be 1 to 2. But I doubt case 1; it is not in thermal equilibrium ? Pls help

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...

Hello, Python,CFD and PF newbie here. I am using Spyder (Python 3.5) and I managed to plot my streamfunction in cartesian coordinates. I tried transforming and plotting in polar coordinates but I am not sure that what i have done is correct. I am not even sure what the plot should look like :/...

For a flowing fluid with a constant velocity, will this field be described as conservative vector field? If it is a conservative field, what will be the potential of that field?

Usually people get kind of frustrated about how can a capacitor charge up when there's no current flowing through, including me. Can I interpret the picture better by considering the electric potential set up by the battery across the circuit? Is this interpretation a correct one? Sorry for...

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...

hello everyone, i hope you're doing well, i am new to this forum so i am not sure if this is the right place for my question what i am doing is trying to calculate the air flow needed for intake of an RC engine Zenoah G320RC in the attachment files, it's a pdf for the info about the Standard...

I work in the oil and gas industry and frequently encounter an issue involving isolation valves that do not seal 100%, and that begs me to ask the following question... I often need to isolate particular sections of piping so that a segment can be opened/disassembled for maintenance. When I...

Hello, my first post here. I encounter a situation frequently at work that I'd like help with so here it is... When I isolate a particular section of pipe (by closing valves), I then bleed off the pressure in the isolated section (volume of isolated pipe varies from 3 cubic meters up to about...

I need to create some sort of animation to explain how water flows in a flow diagram under different conditions, and wonder what kind of software would be suitable for creating it? I'm keeping it very simple, like colored lines that are in some way animated to indicate how things flow and work...

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...

What affects how fast the water come out of the tube?(size of tube, size of opening where the water enters, etc) thanks in advance.

I need this clarified. I've been told that if you have a circuit with a load resistance of 0, but you have a power supply of internal resistance, when you have no voltage coming from the power pack you will still get a current. I don't understand how this works. I've been told its because the...

I don't understand how compression of a gas causes heat to flow out of the container of that gas... Could someone please help? Thank you in advance!

Homework Statement based on this picture in the notes , the author gave that if D is below B , then h2 and Q2 = 0 , what dos it mean ? what does it mean ? water cannot flow out and in from B ? please ignore the pencil sketched-part Homework EquationsThe Attempt at a Solution

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

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...

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 ...

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...

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)...

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...

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.

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...

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

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

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

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

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...

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

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...

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 ?

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...

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...

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...

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...

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 +...

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...

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...

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...

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...

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

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...