Fluid Definition and 1000 Threads

An unsteady fluid flow has velocity field q= - 1/2 sin t ( xe^-y, e^-y). Show the flow is incompressible and find a stream function. Find the path of the fluid particle which is at (1,0) at t=0. I only know it has six faces and the sum of all six terms has to be zero in order to show the...

I understand everything up to B). I believe Bernoulli's is applicable here, however I am unsure as to whether or not the pressure before the tube (pgh) is the same or different as the pressure at the tube pgh +p0. I ask the same question for the opposite end of the tube. I know that pressure...

It appears to me that a typical physics curriculum only touches upon topics from fluid mechanics very briefly in the introductory level physics. However, I imagine that the material there is very interesting and potentially relevant (plasma physics, etc). If I wanted to get a deeper...

Homework Statement I am currently looking for a (simplified) model to see how far/fast a object will sink in a high viscous fluid. I found a lot of information about sinking spheres and the maximum contact angle with the fuild because of the surface tension before it sinks. And a example...

I want to know approximately how compressible a fluid can become when H2O bubbles are present. Does anyone know how to do this? Thanks.

Homework Statement An upper tube of cross sectional area A, atmospheric pressure, and height h1 is connected to a lower tube with cross sectional area A/2 (and height 0). A fluid of uniform density rho flows through the system, with velocity v measured in the upper tube. A small open tube...

Imagine we have a perfect fluid with zero pressure (dust), which generates a solution to Einstein's equations. Show that the metric can be static only if the fluid four-velocity is parallel to the time-like (and hypersurface orthogonal) Killing vector characterizing the static metric. So, I...

Homework Statement The L-shaped tank shown in the figure is filled with water and is open at the top. If d = 4.81 m, what is the total force exerted by the water (a) on face A and (b) on face B? image: http://edugen.wileyplus.com/edugen/courses/crs4957/art/qb/qu/c14/fig14_33.gif Homework...

A television transmitting antenna is placed on top of a mast which is 30m high and 300mm in diameter. The mast is on top of a tall building. The wind blows at 35m/s and at normal atmospheric pressure (1.225kg/m^3). If the drag coefficient for the mast is 0.2. calculate: (i) the total drag...

Homework Statement the probem is from the book: Fundamental mechanics of fluids by I.G. Currie is from the chapter 4 ( 2 dimentianal potential flows ) is the problem 4.4: . Consider a source of strength m located at z = −b , a source of strength m located at z=- a^2 / b , a sink of...

Through a spiral pipe is circulating a fluid with high speed, this will lead to many effects and forces like inertia and gyroscopic effect. http://www.2live.ro/demo/Serpentina.bmp I do not know how to approach the problem in order to find the distribution of forces...

Hi all, I need to calculate the pressure in a fluid at some fixed distance from a flat plate which is accelerating (normal to its surface) through a fluid. If you assume the plate to be infinite (i.e. a rigid half-space), then I think the problem can be formalised as a one dimensional...

Hello friends, I am performing an experiment and need a charged fluid here are some questions I have, hopefully someone can help. Can I create a charged fluid by taking distilled water, then adding NaCl (positive and negative charges), and then immersing the positive end of a voltage...

What should I consider if I have three centrifugal pumps then the water of these three pumps flow into one pipe? How to calculate the pressure in the intersection of the three pipes?Thank You.

hi all. i am trying to formulate some testing of different motor oils. i am looking to document which oils have better cooling properties. i read some info years back that a straight oil like SAE30 actually cools better than say a 5w30, reason being is because the multi-grade uses long chained...

Hi, I am a first year studying mechanical engineering and I am having trouble understanding bernoulli equation. This is the first question in the tutorial and I can't seem to get the right answer. Water flows through the pipe contraction shown in the figure below. For the given 0.2 m...

Homework Statement Water with air bubbles in it flows through a pipe that is wide and then gets narrower. As the water gets to the narrower section will the air bubbles get larger, smaller, or not change? Homework Equations Bernoulli's equation. I tried to write it out but I was not...

Homework Statement 5. A rectangular opening on the side of a water tanks has a width of L. The upper part of the opening it's in a height of h1 underneath the water y and the bottom part it's in h2 . prove that the volume of water that leaves the tank is given by : 2/3(L)√(2g(h1³-h2³))...

I want to find some force data for fluid stirring. originally I intended to record the data using my force sensor, but it doesn't have the resolution to read stirring force for Newtonian fluid. unless there's a Newtonian fluid with high enough viscosity to produce a reaction force greater...

I'll be starting a graduate program in a computational science department in September. My research will be in the field of Fluid Mechanics. However, I don't come from an engineering background. My undergraduate degree is in Applied Mathematics where I studied ODEs, PDEs, Calculus, Algebra...

Homework Statement The viscosity of a fluid is to be measured by a viscometer constructed of two 75 cm long concentric cylinders. The outer diameter of the inner cylinder is 15 cm and the gap between the two cylinders is 1 mm. With the outer cylinder fixed the inner cylinder is rotated at 300...

There is a course at my school called nuclear power engineering. It's an optional course, but it sounds important for a nuc engineer. The course has two prerequisite courses: fluid mech, and heat transfer which i can take as electives. The thing is that I didn't take statics or dynamics (not...

Homework Statement A tank consists of two chambers, one open to the atmosphere and another closed and filled with a gas. The two chambers are connected by a sluice opening. What is the pressure in the gas, in gauge and absolute terms if the barometric pressure = 742 mm Hg. Difference in height...

Fluid solutions of the EFE are very useful in GR and pervade all of the theory's applications be it cosmological (FRW dusts for matter-dominated models, radiation fluids for radiation-dominated ones...) or astrophysical (stars interior models, etc). Now, I know there is a component of...

Hi guys, I haven't taken any physics classes or any of the sort to figure out the problem that I am faced with. basically what where creating is a wave maker like this (sorry this is the only video i found) basically the "float" that you see is shaped like a quarter of a circle...

Homework Statement A professor gave a pipe network problem to be solved by the Hardy-Cross method. However when I attempted to create a scale drawing of the figure to get a better idea of the problem I realized it is physically impossible to create his design. Now i am wondering if because...

Homework Statement The Attempt at a Solution I am interested in why my method is flawed: Alright I know how to do this problem. Essentially you solve mass flow rate = rho * double integral of u dA. HOWEVER, I decided to do this differently. I know that I can solve for the average u from...

Hi all, I am stuck on a problem, and it's been a while since I took fluid dynamics. I have a cylindrical tank of know capacity with an inlet, where a vent is attached, and an outlet, the fluid gets sucked. The tank has fluid in there with known volume and density. If I know the usage rate of...

Homework Statement You are going to examine the viscosity of a fluid by dropping a ball bearing into a cylinder of fluid and measuring the fall time. You will use a ruler to measure the height, h, of the fluid column, and a stop watch to measure the fall time, t. The ruler and stop watch...

Even though the velocity of each particle is constatnt in staedy flow,all the fluid particles are accelerating.If velocity of every particle in the steady state fluid flow is constant how does the fluid accelerate?In that case,why is there a bernoulli theorem for unsteady flow?

Homework Statement A fluid as velocity field F(x, y, z) = (xy, yz, xz). Let C denote the unit circle in the xy-plane. Compute the circulation, and interpret your answer.Homework Equations The Attempt at a Solution Since the unit circle is a closed loop, I assumed that ∫ F * dr = 0 (the ∫ symbol...

Homework Statement A venture flow-meter can be designed as shown in the figure. At position 1 the velocity is 0.5 m/s, and pressure is 1.3 bar. The cross section area at 1 is two times the area at 2. The fluid inside the manometer has a density ρ, and the fluid column has a high...

Hi, I've done a search and I know that other people have askled for a good textbook for fluid mechanics for a 1st year Mech Eng student however, I'd like to find one with a lot of worked example ploblems. I'm finding my course notes are too far a jump from the simple examples our lecturer...

Hi! The velocity field as a function of poisition of an incompressible fluid in a uniform acceleration field, such as a waterfall accelerated by gravity can be found as follows: The position is \vec{x}. The velocity field is \vec{v} = \frac{d\vec{x}}{dt}. The constant acceleration field...

Im confused with the sign convention... From my notes I have that for mass flow rate: Entering is -m and leaving is +m momentum : Entering (-m)(+v) and leaving is (+m)(-v) Example: for a rectangular control volume, let's say, left side is point 1 and right side is poinit 2...

Homework Statement "Suppose that a liquid has an appreciable compressibility. Its density therefore varies with depth and pressure. The density at the surface is ρ0 (a) Show that the density varies with pressure according to ρ=ρ0ekp where P is gauge pressure at any depth and k is the...

I have been running this question through my mind. If you apply pressure to a fluid (with say a piston) through a straight hole then the faster you push it through with applied pressure then the more back pressure it builds. Until eventually it pretty much locks up. I understand that...

Homework Statement The Attempt at a Solution So first I found the density of the air coming in and going out. Next I used conservation of momentum with two forces caused by the pressures at the entrance and the exit of the nozzle. I end up getting 1004 which is not the same as...

Compute the coefficient of expansion α in terms of P and V... Homework Statement Compute the coefficient of expansion α in terms of P and V for an ideal Van der Waals gas Homework Equations (p+a/v^2)(v-b)=RT The Attempt at a Solution Is this as simple as solving for a? How...

Hi all, I have a question about calculating the concentration of continuous air and carbon monoxide flowing through a pipe. If the gas cylinder originally has 20% CO and 80% air and it will be diluted by another gas cylinder of air, how do you account for temperature, pressure, and...

Homework Statement Here is the question along with my attempt: As you see in my second equation there are two unknowns, A_out and dm/dt. I think my problem is that I don't exactly understand the equation. dm/dt is the net mass flow rate. For example if dm/dt is a positive number then there...

when you stir fluid in a beaker of fluid, how is the motion on the fluid by the stirring rod calculated? the fluid is represented using smoothed particle hydrodynamics lagrangian method so that I can look at fluid as a bunch of spheres interacting with each other through a sort of force...

Does a pipe have to be completely filled with a fluid to measure its pressure? For instance if I have a small diameter pipe that diverges to a bigger pipe. The small pipe will be completely filled with water, but will the bigger pipe be? If the bigger pipe is only half full of flowing water...

Hi, Can Someone Elaborate the fluid(water) Characteristics Such as Velocity n pressure When it passes through a divergent Part. Actually The Fluid is pumped Out from A 0.5HP Centrifugal Pump and then made to pass through a Divergent Part.

Author: John D. Anderson Title: Computational Fluid Dynamics: The Basics with Applications Amazon Link: https://www.amazon.com/dp/0070016852/?tag=pfamazon01-20 Prerequisities: Calculus, Introductory Physics and/or Aerospace Engineering, Fluid Mechanics, Heat Transfer Level...

We are beginning a project in my Intermediate Fluids class to make a program that can do aerodynamic analysis on an air foil. First, given any three nodal coordinates (x,y) of a triangle, we must write a program to compute its surface vectors and area of the triangle. The nodes will be in...

Hi guys and girls, I hope you can help an electronics engineer out of his place in the mechanical world:rolleyes: My very basic question is for a vessel holding a liquid at a given pressure and a given opening in the vessel how can i calculate exit velocity and mass flow rate? Like if i...

Walking round a local amenity area today brought this photo of a side stream cut off by the local river in spate flowing past from left to right in the picture. The river water is reddy brown and the side stream grey-green. The two waters are not mixing as can be seen by the well defined...

Can anyone give me some advice on where I should take my points of reference when using bernulli equation. I know the point will vary according to the problem, but can one say, always begin looking for this and that and apply the equation... Then move to this and that, etc

I am working on hobby project with almost no budget. I bought some "nice" (cheap & simple) electronic solenoid valves for water flow. I've since discovered that they need 3PSI to open. Which is ok for the supply lines. But the drain line requires that as well. Now I either need a column of water...