Fluid Definition and 1000 Threads

hey :smile: I am a college student and am looking for a liquid having the following properties at very low temperatures (probably around 100-150 K) - 1) Very high density 2) Very high temperature of vaporization 3) Less- Volatile 4) High specific heat capacity

Looking for a way to increase magnetic forces in electrical devices, an option is reduce the air gap, but some times it is not a practicable solution. The question is what happened if we put a ferrofluid between the magnets? Imagine the following situation: a closed volume composed by a...

Hi, I need clarification on the difference in head loss for turbulent flow and laminar flow. I understand how the head loss due to friction is different for the two regimes. For friction head loss, the friction factor is 64/Re for laminar flow, and a more complex formula for turbulent flow. I...

A u tube open at both ends and a uniform cross section contains a mas of mercury,m and a density of 'rho' if the level is slightly disturbed show the surface oscillates with a periodic time of Tn=2pi sqrt[(m/2g'rho'a)] where a is the cross sectional area. i understand how to do this...

Hey everyone! I am working on improving natural draft counter flow cooling tower efficiency as my final year B.E. project. I came across a research paper that said that at transverse cross section of the tower, above drift eliminators, the air velocity decreases from the periphery to the...

Hi all, I purchased this photochromic fluid I have been trying to get to the bottom of how it works. From wikipedia http://en.wikipedia.org/wiki/Photochromism For example, the spiro form of an oxazine is a colorless leuco dye; the conjugated system of the oxazine and another...

This is my first post so I hope this in the right place. I am fairly sure this is quite a straight forward question but I having trouble working out the details of it. "State the boundary conditions for an inviscid fluid at an impermeable fixed boundary x_3-h(x_1,x_3)=0 where we do...

Homework Statement Find the fluid force of a triangle with base of 6 ft and height of 4 ft submerged vertically into a body of water,vertex down, to a depth of 3 feet. Homework Equations from c to d W [SIZE="6"]∫ h(y) L(y) The Attempt at a Solution I set up the triangle on...

Some fluid act weirdly at zero kelvin like Helium 1- it loses viscosity 2- flows upwards along the wall against gravity ! And there is a property I'm not sure about, that it can't be held in a container because it leaks out of it. However what's the physical explanation for all of that...

What can a PH meter tell you about the quality of fluid it is measuring?

The correct answer to this problem is h2 = h1 but I don't get it. According to what I understand, F=p/A So for the Tube on the left: F1 = P/A = (\rho*g*h1)/A1 For tube on the right: F1 = P/A = (\rho*g*h1)/3*A1 I get h2=3h1 (i know if you think about it this does not make sense...

Homework Statement A fluid of viscosity \nu is rotating with uniform angular velocity \Omega inside a cylinder of radius a that is also rotating. At time t = 0, the cylinder is brought to a rest. The circular motion of the fluid is gradually slowed down due to the viscosity; show that u_\theta...

Homework Statement A light cylindrical vessel of radius r is kept on a rough horizontal surface with sufficient friction so that it cannot slide but can topple. It is filled with water up to a height 2h and a small hole of area a is punched in it so that the water coming out of it falls at the...

Homework Statement A cart is acclerating to the right with a=3m/s^2. Fluid is in hydrostatic state. Find the force on the back wall. Cart goes .8m into the page. In the image dotted line is free surface when cart is stationary. Homework Equations \vec{\nabla P}=\rho (\vec{g} -...

Homework Statement prove that with flow in a corner, with stream function ψ=Axy, particles are accelerating per \frac{DV}{Dt}=(A2(x2-y2))/r; A=const; r-distance from the center of the corner Homework Equations Vx=U=\frac{∂ψ}{∂y} . . Vy=V=-\frac{∂ψ}{∂x}...

What would happen to the accuracy of a float gauge if the fluid it is measuring is heated?

I was in my physics of the human body class and we got on the topic of pistons. It was given to me that the dampening force pertaining to such a piston filled with a gas is proportional to the square of the velocity of the piston; however, for fluids it was given as simply proportional to the...

Homework Statement Find F, the force acting at the top of the gate. The gate is 2m high and 2m into the page. It is hinged at the bottom (red dot in the diagram) Density of fluid varies linearly. 1000 kg/m3 at the top and 1600 kg/m3 at the bottom (depth of 4m) Homework Equations...

Hello I am having difficulty in comprehending the basics of fluid mechanics . I have few questions which I would like to put one at a time , so as not to create any confusion . In the following attachment , a container with a liquid rests on a surface .I would like to understand what are...

Homework Statement A Venturi meter is constructed with an inlet diameterof 100 mm and a throat diameter of 40 mm. The meter must be calibrated prior to leaving the factory. The meter is installed in a 100 mm diameter water main with a...

Hi In my lecture notes we making some calculations and all terms \mathcal O(M^3) are to be thrown away. Here M is the Mach number. Now, there is the expression (u denotes the velocity): uu\partial_t \rho \approx \rho_0 uu\nabla u which in my notes are thrown away because they claim it is...

Homework Statement If the pressure reading of your Pitot tube is 17.0 mm Hg at a speed of 150 km/h, what will it be at 700 km/h at the same altitude? Homework Equations The only eq I could think if is p = p2+ 1/2 density (v2^2 - v1^2) But I don't know the density The Attempt at...

Is there a mathematical relation for the temperature change when a fluid flows through a pipe from one end to another? I am not aware of any equation in thermodynamics for this, but I would guess the following parameters are important : 1. cross-sectional diameter of pipe 2. viscosity 3...

Homework Statement The Black Mesa pipeline transports 660 tons / hr of solid coal ground to 8 mesh (2.4 mm) as a 50 wt % slurry in water with an estimated sg of 1.26 for 273 miles across northern Arizona. The pipeline ID is 18 inches and the slurry flow rate (coal and water) is 4200 gal/min...

Homework Statement Homework Equations fluid pressure = fluid density * depth * gThe Attempt at a Solution My understanding is that fluid pressure at any two points at the same depth is equal, for a fluid at rest. But because one end is open, the pressure at point C is less than B and equal to...

consider the image on the drawing at the top (above the yellow arrow) if i had some non-compressible fluid enclosed in a pipe like container that looped back in on itself (as shown in figure), and if the container was non-elastic, when i rotate this container filled with fluid such that...

Homework Statement Water at 20 degrees C flows in a 0.8cm diameter pipe with a velocity distribution of u(r) = 5[1-r2/(16x10-6)]m/s. Calculate the shear stress on (a) pipe wall (b) at a radius where r = 0.2 cm (c) at centerline of pipe Homework Equations Shear stress = viscosity x du/dr...

I have the pipe size, flow rate, and a duration. How can I figure out the amount of fluid that was released from the pipe?

Homework Statement A water injection line is made from smooth capillary tubing with inside diameter D = 25.0 mm . If the length of the pipe is 0.75 m and assuming laminar flow is present up to Re = 2000, find (i) the maximum average velocity at which the flow is laminar (ii) the pressure...

Homework Statement AB is homogeneous with mass of 180 kg, goes 1.2m in the page and is hinged at A and resting on aa smooth bottom at B. All fluids at 20 C. Find height of water that will result on 0 force at B Homework Equations M_s = \int\int_s \ (\vec{r} \times \hat{n} )PdA...

Homework Statement Air is blown through a circular and horizontal Venturi tube, as shown in the figure below. The diameters of the narrow and wider sections of the tube are given, and the height h of the mercury column is measured to be 1.00 mm. What are the air speeds in the wider and the...

Hi all! Imagine you have an ideal sphere (made of steel or plastics). Then fill it completely with some fluid, e.g. water. Then rotate it very fast. What happens to a fluid inside? I suppose that it will try to change its shape (from spherical to flat). But there is no space for any size...

Hi, What is the molecular-level mechanism of shear-thickening of oobleck (cornstarch-water paste)?

I'm pondering courses for the autumn and I'm at a bit of a crossroad. Doing an intro thermodynamics class right now which involves all the stuff I don't really enjoy - measurements, looking stuff up in tables, memorization, etc. Very non-theoretical. It feels like an AP chemistry class...

Hello everyone I still don't understand crystalloids 1) Let's say someone lost 100 ml of blood due to accident. If you are giving crystalloid therapy, why do you have to infuse 3 times the amount. What I think is when you give crystalloids IV, they go into extravascular and...

Homework Statement Task number 2. The problem is that my solution is wrong but the lecturer didnt want to explain what is wrong, she insists on doing it by myself. But to be honest I'm not really good at it and I just need someone either explain it or solve or at least check it and tell me...

Homework Statement In 1993 the radius of Hurricane Emily was about 350 km. The wind speed near the center ("eye") of the hurricane, whose radius was about 30 km, reached about 200 km/h. As air swirled in from the rim of the hurricane toward the eye, its angular momentum remained roughly...

I have two reservoirs, connected by two pipes. The first reservoir is higher in elevation than the second. If the system is full of static water, what would the total energy line look like? Since the velocity of the flow through the system is 0, would the total energy line just be a straight...

Hello, I have two fish tanks next to each other. One is big (36 gallons, about 2 feet tall), one is smaller (10 gallons, about a foot tall). I want to make a connective tube so that my eel can swim between the two tanks but I don't want either tank to overflow. I am not adverse to raising the...

I was just wondering why a body immersed in a fluid at rest experiences a perpendicular force on its surface? Why can't there be a component of force in parallel direction to the surface ? I read somewhere that this would cause the fluid to flow parallel to the surface but i don't quite...

Homework Statement For a flow of a compressible fluid through a narrow tube, the following statement is correct a) the volume of the fluid crossing any section of the tube is constant. b) density of the fluid is independent of pressure. c) mass of the fluid crossing any section of the...

Homework Statement Water stands at a depth D behind the vertical upstream face of a dam. Let W be the width of the dam. Find the resultant horizontal force exerted on the dam by the water. The Attempt at a Solution So I know how to solve the problem, I was just unsure of whether we...

While working on fluid dynamics problems I noticed that the incline angle sometimes starts at middle while other times starts at one end. Is there an explanation for this? I know the slope =(linear a)/(gravitational g)

Homework Statement What is wrong with the following argument from Bernoulli's equation? Suppose a fluid in a bucket is rotating under gravity with constant angular velocity W so that velocity is: u = (-\Omega y,\Omega x, 0). Then: \frac{P}{\rho} + \frac{u^2}{2} + gz = constant...

Hi, I was wondering if anyone would be able to help me with this problem:Homework Statement I have a mass, that is being held in the air by several downwards pointing jets of water. I know the diameter of the nozzles from which the jets are flowing, and the flow (Q) from each jet, which is the...

Most liquids can be assumed to be incompressible, since the Mach-number is much smaller than 1. That means that the density variations are negligible and from the relation between pressure p and density ρ, p=c_s^2 \rho we see that the pressure in constant as well. Now, say that I look at a...

Hi Guys. I hope some of you are able to help me out. This is NOT a homework. I have to explain the difference between the three different rate of change (time derivatives) of a property (such as mass, momentum, internal energy, etc) in a continuum? 1 )The partial time derivative 2)...

Homework Statement I have some conceptual question in the fluid mechanics topics which has been bugging me for quite some time now. 1) When wax is rubbed on cloth why does the cloth become waterproof 2) A weightless baloon is filled with water. What will be the apparent weight when...

Hi The speed of sound in a fluid is defined as c_s^2 = \frac{\partial P}{\partial \rho} where P is the pressure and ρ the density. In my thermodynamics-course this was how we defined the speed of sound in an ideal gas, I have never read the explanation anywhere for, why this relation is also...

Homework Statement what factors affect the size of the pressure at a point in a static fluid? Homework Equations The Attempt at a Solution