Fluid Definition and 1000 Threads

Homework Statement Consider a tank used in certain hydrodynamic experiments. After one experiment the tank contains 200 L of a dye solution with a concentration of 1 g/L. To prepare for the next experiment, the tank is to be rinsed with fresh water flowing in at a rate of 2 L / min. The...

This a practical problem for the design of a system which uses a water driven hydraulic motor. Assume a 100 gallon tank is filled with water, constantly filled further pressurized by a pump to 500psi Assume a hydraulic powered motor which operates with intake required at 200psi...

this is not a homework problem, its a practical problem for a system I'm working on, but its looks pretty much like a homework problem so posting here. Homework Statement Assume a 100 gallon tank is filled with water, constantly filled and pressurized by a pump to 1000psi Assume a hydraulic...

In Helmholtz original thesis On integrals of the hydrodynamical equations, which express vortex-motion, he mentioned in the first section that the change undergone by an arbitrary infinitesimal volume of water under the time dt is composed of three different motions. One of them is an expansion...

Homework Statement a manometer consisting of tube that is 1.25 cm inner diameter . on one side , the manometer leg contains mercury,10cc of an oil(S.G.=1.4)and 3 cc of air as a bubble in oil . the other leg contains only mercury . both legs are open to atmosphere and static . An accident...

I've read that you can view static pressure of a fluid as energy density, which makes sense to me. I've also seen that the power of a fluid flow can be calculated by multiplying the pressure by the volumetric flow rate. However, doesn't a flow also have kinetic energy? How can you calculate the...

Hi please check the highlighted question in the attachment and the solution and see the problem, i need help please. I have two questions about it: 1- why didn't we take the plug as a vertical wall and thus the force would be integral of pressure x area? 2-WHERE DID THE FORCE DUE TO...

I've been solving fluid mechanics problems and i encountered two problems that made no sense to me. Both problems that ask about the force done by water on a VERTICAL wall under the level of water. One problem was solved by taking the integral of the gauge pressure and multiplying it by the...

Young-Laplace equation in Fluid Mechanics EDIT: I meant the Young-Laplace equation, of course, not the Young-Lagrange.. sorry! Heya! According to said equation, ΔP*area = γ*circumference, for an interface of spherical fluid-element. Can I pls get some explanations? 1) Why is...

Homework Statement A rigid vertical wall separates two liquid reservoirs. The first reservoir contains oil of density p=864 kgm-3 at a height of 6m above the ground, while the second reservoir contains water (1000kgm-3) at a height of 5m from the reservoir bottom. Calculate the resultant...

Hey all, I'm a Math major (most of my coursework was in PDEs) and just got accepted into Grad school (yay) for Mechanical Engineering. I need to be very familiar with fluid mechanics and have about 5 months to do so. Trouble is, the last fluid mechanics course I took was about 3-4 years ago...

Homework Statement Two flat plates are oriented parallel above a fixed lower plate as shown below, The top plate, located a distance b above the fixed plate, is pulled along with speed V. The other thin plate is located a distance 0.3b (cb) above the fixed plate. This plate moves with speed...

Homework Statement Two long, hollow, and coaxial conducting cylinders, with radii a and b>a , are lowered into a tub of fluid with dielectric constant \kappa . A voltage V is applied between the two cylinders. The fluid is observed to rise up some height h into the volume between the...

hello In MTW excercise 22.6, given a fluid 4-velocity u, why the expression : ∇.u is called an expansion of the fluid world lines ? Is the following reasoning correct ? We know that the commutator : ∇BA - ∇AB is (see MTW box 9.2) is the failure of the quadrilateral formed by the vectors...

Several species, including the squid, cuttlefish, dragonfly fish and many microscopic organisms, move themselves around by a kind of jet propulsion. In each case the animal absorbs fluid in a body cavity and expels it through an orifice by contracting the cavity. If a squid has a mass Ms when its...

I am working on a fluid mechanics problem modeling something I've come into contact with at work. I have an open to atmosphere reservoir of a fluid with properties as follows SG=1.48 Viscosity= 47000 Cp Height of fluid column, 3 inches or so. i.e. Neglible I then have a pressure...

Good evening, I've been trying to wrap my head around this problem for some time and I just can't seem to get it straight. What I am trying to achieve: I want to program a recursive model that calculates the position of a moving body in a fluid after a certain time. What i have done...

Ok so maybe this will take some work to wrap your heads around. Maybe not. I sure know that I have had some real doozies of headaches working with this and visualizing it. Rather than look at particle capture in a gold sluice as a CFD problem I have been trying to visualize it as a statistcal...

So I'm in the Navy. I work on an aircraft carrier that just went into drydock. The drydock has a large trapezoid door keeping the water out on one side. Our captain wants to know how much force is being held back on that door. I found the dimensions of it and calculated it, but now I'm having...

Homework Statement having problems differentiating Homework Equations Tw ( wall shear stress)= -U(viscosity)*du/dr been given u as 2V(1-(r/r)^2) The Attempt at a Solution i substituted u in and got d/dr (2V(1-(r/r)^2) i tried to multiply out the minus sign and 2V and got...

Homework Statement The question asked is: Two students are given 2 stones and a waterproof stopwatch, along with swimwear. Using this material they are then required to estimate the distance across a lake. This question could obviously be answered using fairly simple process, however, it is...

In fluid mechanics, the velocity of the liquid going in or out (source-sink) of a hole in a two dimensional model is Q/(2 pi r). http://farside.ph.utexas.edu/teaching/336L/Fluidhtml/node63.html What is the velocity in three dimensions? Is it Q/(4 pi r^2) ?

1. Homework Statement a) Calculate the theoretical diameter of pipe, nominal pipe diameter and mean velocity of nominal pipe diameter. Maximum velocity = 1.8m/s Q(vol. flow rate) = 0.01M^3-1 b) Find the Reynolds number for the process and then the head loss due to friction, state any...

I'm a physics noob but this is something I was thinking about when I read in my textbook that fluids are generally incompressible. Let's say I had 1000 L of water enclosed in a sphere several meters thick (say, 2 meters thick) made of an extremely hard, dense metal with 0 outlets or holes of...

Fluid flows faster in a narrow tube which results in low pressure and high pressure in a large tube?

Suppose we have the set up shown in the thumbnail, in which an incompressible fluid moves from left to right, trapped by converging streamlines. The rate of acquisition, F, of momentum by the fluid is surely F = \rho A_2 v_2^2 - \rho A_1 v_1^2 = \rho A_1 v_1^2 \left\{\frac{A_1}{A_2} -...

Question "Fluid Mechanics(Robert Granger)" fluid Velocity comp. Chapter 4. eq. 4.28- 4.30 u = u0 + (x - x0)(du/dx) + (y - y0)(du/dy) + (z - z0)(du/dz) v= ... w = ... Then without any significance explanation these equation take a form of eq 4.31 - 4.33 u = u0 + 1/2...

I am currently in the process of designing a section of pipe in which a fluid will flow within, and would like to determine the specific heat transfer which may occur once the fluid enters the pipe, until it exits. The fluid will be flowing at a constant velocity "V" at a Temperature "T1" at...

Sorry if the formulation is imprecise, I'm a biology major trying to study some physics. The question is: So far, my reasoning is: I make an assumption in Step (2) that decreasing the pressure will decrease the temperature. But I'm not sure what the justification is. I only know of the ideal...

Homework Statement A scientist attempts to model the flow of blood through an artery using a hollow pipe of diameter 1.8cm. A fluid density 1060kg/m^3 is used to simulate blood in the pipe. Viscous effects can be considered to be negligible. TO study a blockage in an artery, the...

Hello community, I'm new here. I'm using FORTRAN to model the motion of electrons and ions when accelerated under a high voltage potential. I'm using a fluid approximation and MHD-like equations (conservation of mass, energy, momentum) and a finite volumes numerical method to solve the...

Hi all:I have a question regarding the fluid mechanics of turbine, both impulse and reaction turbines. I have searched many sites , including my fluid mechanic textbook, and yet I still don't quite understand the physics behind a turbine.Impulse turbine is a bit easier to understand as I can...

Someone showed me a graph that has to do with how a cylinder oscillates in uniform flow, starting from no oscillation, to high oscillation, back to none. I know the y-axis is amplitude/diameter and the x-axis is velocity / (natural frequency X diameter) I would just like to find out more...

Homework Statement An ideal liquid flows horizontally through a pipe of cross sectional area 3cm2 with a velocity 1ms-1. The pipe narrows to a cross sectional area 1cm2. 2 vertical pipes are connected to the pipe, one in either region. Calculate the height difference of the liquid between...

Been playing with this idea http://www.halfbakery.com/idea/Quasi-aerogel It's been boiled down to some sort of elastomeric beads, filled with a suitable gas/fluid/liquid (depending on pressure/temperature) suspended in a liquid. The idea is to increase pumping and compression...

If anyone can help it will be greatly appreciated. Im trying to figure out what type of pressure valves to use in an underwater flow widget. The widget is a cylinder with 1 inflow valve and 1 outflow valve. The cylinder is filled with colored water. As the cylinder moves through water I want...

Relation between Cooling rate and Viscosity Hi all I have a situation where i have a molten Aluminium Copper alloy melt poured in a mould to be solidified. This means, the mould temperature is lower than than than the poured melt. I am thinking about a relation which associates temperature...

I know this question has been asked plenty of times, but nonetheless I wanted to get some recommendations that might better jive with my situation than other the other threads I've read about this topic. I'm a first year grad student in physics that hasn't had a course in fluid dynamics, but...

Homework Statement Water is retained in a 1.25 rectangular section channel by a sluice gate. This gate can pivot about its base, the depth of the water is 1.5m and the density of the water is 1000kgm^-3. You must find the tension in the horizontal retaining cable attached to the top of the...

I recently took a crash course that included some topics in fluid mechanics. I learned that you can use the concept of impulse and momentum the calculate the force of fluid, for instance a jet of water on a turbine blade. The equations used are: ƩFx = ρQ(Vx1-Vx2) ƩFy = ρQ(Vy1-Vy2) I...

Currently I am intended to start next fall as a Physics major at the University of Delaware. My interest lies in Fluid Dynamics particularly in Geophysical Fluid Dynamics. I understand it's really early in my college career and I may change my interest, however I was surprised to find that as a...

Does anyone have any links that can explain everything that has to do with fluids... Such as: Bernoulli's equation Pressure Flow rate ..etc Any help would be appreciated, i just can't seem to grasp this concept

Hey Guys, I am supposed to take Fluid Mechanics in Fall 2013. The course has lots of prerequisites and I have taken them all. One of the prerequisites is Dynamics. In Dynamics I was taught how to analyze objects in motion using Newton's Second Law of motion, Work and Energy method and...

Homework Statement The manometer illustrated in Fig. Q2 contains water and kerosene (specific gravity of 0.82) as indicated. With both ends of the U-tube open the height H0 =20 mm. (i) Determine the height, h , when both ends of the tube are open. [4] (ii) Determine the new value of...

I’m confused as to how energy per unit weight can be quantified as a head of fluid. I have tried to understand this from a couple of angles but am getting confused. I’ll go through my methodology to see where you can spot the cracks. If energy = work done = (force * length over which it acts)...

So I want to know what happens when granules are subjected to forces while around other varieties of granules. My interest comes from two places, wanting to gold pan, and how sand surfaces from dirt at the edges of buildings. It doesn't make too much sense to me right now, I'm just having a...

I am trying to develop a calculator to approximate the depth of a trolling rig used by fisherman, which is typically a lead weight with a hook (jighead), attached to a single plastic/rubber shad body (http://www.tacklecoveshop.com/images/Product/icon/1734.jpg). The other typical rig is a...

Viscous fluid flows between two rigid boundaries at y=0, y=h, the lower boundary moving in the x direction with constant speed U. The upper boundary is at rest. The boundaries are porous and the vertical velocity is V (constant) at each one...

I had no luck in the coursework forums though I guess the question becomes simpler if I state it the way I did here. Assuming no complex network, or just a single pipe first feeding the network, why do the speeds in the pipe and even the rest of the network pipes remain unaffected if I change...

Homework Statement A rectangular, flat-bottomed rowboat has a mass of 120 kg when empty. It's 3 meters long, 1 meter wide, and .24 meters deep. How many 85 kg people could it hold before swamping? Homework Equations d=m/v ? The Attempt at a Solution I need to determine the...