Fluid mechanics Definition and 758 Threads

Note: Have been taught nothing about fluid mechanics yet, this task was set to help develop self learning skills, yet with some research I've carried out I'm still at a brick wall so i hope you don't mind helping me! Homework Statement Explain the phenomenon that causes a noticeable...

I'm feeling a lot of difficulty in studying fluid mechanics.. can anybody please kindly suggest me a good book for "fluid mechanics" either in the form of e-book or a hand book (or both) which explains basic principles explicitly..

Homework Statement A differential mercury manometer is connected to pipe A containing gasoline (SG=0.65), and to pipe B containing water. Determine the differential reading, h, corresponding to a pressure in A of 20kPa and a vacuum of 150 mm Hg in B. Homework Equations Distance from pipe...

Homework Statement If the density of iron is 7.8x103kg/m3, what is the highest possible height of a square based column of sides=40cm and mass of 1,000kg?Homework Equations \rho=m/v Fg=\rhovg (I think?)The Attempt at a Solution I took the length of the side of the square and used it to find a...

I know the equation for conservation of linear momentum, and Bernoulli's equation: So I've tried using Bernoulli's equation to find V1, then use the continuity principle to find V2, but then I get stuck on the mass flow rate. I tried a different approach by trying to convert mass flow rate...

Q2. An incompressible fluid with density ρ is in a horizontal test tube of inner cross-sectional area A. The test tube spins in a horizontal circle in an ultracentrifuge at an angular speed ω. Gravitational forces are negligible. Consider a volume element of the fluid of area A and thickness dr'...

hey guys I am new to the forum... i am a first year civil engineering student trying to do a second year course over this summer holiday. for fluid mechanics i was given this h/w problem. could you please tell me if I am correct and if not make explain where i went wrong and how to correct it...

Fluid Mechanics help...please! Hello...everyone... I've come along these lines from "Fluid Mechanics" - by Streeter,Wylie,Bedford These are the lines:

Suppose you're driving along a straight, smooth, level stretch of highway with a constant velocity v. There is a cup of some fluid in your cup holder. How would you go about finding the angle \theta that the surface of the fluid makes with the bottom of the cup as a function of v? And what if...

What would you say are the main focuses of research in aerospace engineering right now, specifically anything to do with aerodynamics or fluid mechanics in general. Is there a lot of research in new areas or is it mainly a lot of small tweaks in order to improve already existing systems? What do...

hello, i am having some troubles with this problem. please take a look and help me if you can. an open-ended can 1ft long is originally full of air @ 70 F. the can is now immersed in water. assuming that the air stays at 70 F and behaves like an ideal gas,how high will the water rise in the...

1. Question A large plate moves with speed (v.o) over a stationary plate on a layer of oil of thickness (d) and viscosity (u). If the velocity profile is that of a parabola, with the oil at the plates having the same velocity as the plates, what is the shear stress on the moving plate from the...

Homework Statement A block of wood floats on water. The density of the wood is .634g/cm^3. Its mass is 243 g. Find the minimum mass (g) of lead we must attach to the block so that it will sink, along with the lead. The density of lead is 11.3 g/cm^3. Caution: you must take into account...

1.I have been asked to: Calculate the density of a fluid if a ctitical velocity of 2m/s at Re=2000 in a pipe of bore 90mm at a dynamic viscosity oc 0.09cP I have calcualted the variables to SI units and found \rho=? Um (V) =2m/s D=0.09m \mu=0.09X10^-3 I am rearranging this...

How large should be the pressure P, pumped by a pump to supply water with velocity v to a part of a building at the height H, where it is consumed. The liquid may be considered as incompressible and inviscid and the flow, as steady and irrotational. (Hint: take into account that the water inside...

Hey all I wasn't 100% sure whether to ask this in the general forums or the homework forums, it's more of a theory question rather than straight-up calculation question. If this is the wrong forum, please notify me and I'll repost this in the homework forum. I've recently done a fluid...

Homework Statement My main problem here is that I do not understand what they are asking. What is the wall shear stress? Do they mean the stress at the "floor" (or whatever you want to call it)? If so, I am assuming I use Newton's Law of Viscosity \tau=\mu\frac{du}{dy} since this is...

I was wondering if anyone could please explain what an intensity diagram would look like if you had a layer of fresh water ontop of x amount of meters of salt water (or vice versa). What is the concept behind this? How could you draw it? The question keeps popping up in past exam questions but i...

ive have recently conducted a lab for investigating the behaviour of fluids in a pipe system the fluid chosen was an oil with a density of 853 kg m-3 i used pitot-traversing gear to measure the pressure at different positions from the wall of the pipe (to the centre and then assumed a mirror...

Homework Statement A body when tested in air of density 1.18 kg/m3 and dynamic viscosity 1.52x10^-5 Pas at a velocity of 35 m/s was found to produce a resistance of 250 N. A similarly shaped body 10 times longer than the original was tested in water of dynamic viscosity 1x10^-3 Pas. Determine...

Hey guys, I'm new here. I've been following PF on and off to get some hints in past but this is the first time I'm posting. I'm doing civil engineering second year and the following is an assignment question (there are total of four questions and I'm stuck on all four :( ). I'm not looking for...

Hi, I've been thinking a while on the problem but I don't know how to proceed and if the method I'm thinking of is the most efficient. Homework Statement A reversed funnel (see the figure I posted) is on a table. We fill the funnel with water until the water reaches the height h. Because...

A few things I don't quite get... about why the surface pressure distribution UPSTREAM of the separation point of a body is different to the theoretical or ideal distribution...? I can see why there will be a difference between the theoretical static pressure distribution but not why the...

Hi I don't know where to start with this problem. Any help would be greatly appreciated. A cone is rotating in a slot at constant angular speed w. The gap h separating the cone and the lsot's wall is much smaller than the cone's height b. A fluid with viscosity mu fills the gap. Obtain an...

I need a good book on fluid mechanic

If anyone could give any help with this problem it would be much appreciated. At A, a pipe has a bore(internal diameter) of 100mm and at B it is 150mm. The pressure head at A and B are 21m and 15m water coloumn respectively. There is no pump between A and B while the distance between A and B...

Homework Statement A picture of the problem is attached Assume that the streamlines for the wingtip vortices of an airplane can be approximated by circles of radius r, and that the speed is V = K/r where K is a constant Determine the streamline acceleration as and the normal...

Homework Statement Mercury is poured into a U-tube as in Figure P15.18a. [see the picture here: http://www.ux1.eiu.edu/~cfadd/1350/Hmwk/Ch15/Images/P15.18.gif] The left arm of the tube has a cross-sectional area of A1 = 10.0 cm2, and the right arm has a cross-sectional area of A2 = 5.00...

Hello, I am an undergraduate student interested in fluid mechanics and was wondering what courses would I need to take (or be useful)? Any recomendations for good introduction to fluid mechanics books? thanks for your time!

Homework Statement Determine the volume of foam needed to support one cargo block with the following conditions. The bottom of the block is 2 cm above the water line and when viewed from the top there is 1 cm of foam around all edges of the cargo block. The dimension of the block are 3.5...

hello fluid knowers! here is a question i have asked from several students every time a different answer was given to me. now let's see what is your answer mechanicals! question: we have a steel block floating in mercury as shown below...

Homework Statement http://i284.photobucket.com/albums/ll12/uradnky/fluid.jpg I'm asked to solve for the force on the projected plane surface and show where it is acting. This problem seems pretty easy, but with the dimensions given I can't find Lc, so I can't find dc to begin it. Is...

Im working on a problem involving a 70 lb empty drum. The diameter and length are given. I am trying to find if it will float stably if placed upright in water. I did a similar problem to this involving a solid cylinder with no problem. But I am trying to figure what special...

Im working on the problem below... http://img90.imageshack.us/img90/4939/dfadfgs5.jpg Im having trouble finding the distance I have labled in the problem...H_c...which is the distance from the fluid surface to the center of the hatch...It appears to be found just using geometry but I am...

Hello, I have the following problem with respect to fluid mechanics: A source of strength Q is in a 3D space and subjected to a parallel flow U along the x-axis. The position of the source is at (xq,yq,zq). This will lead to the following velocity potential in cartesian and cylindrical...

Fluid mechanics (urgent help) i got stuck in the middle... guess i could do with some help! A siphon has uniform cross sectional area of 10^(-3) sq.m consider that water has no viscisity. A tank has height upto 80m. half of it contains water. the end of the siphon inside the tank is 20m...

Homework Statement A glass cube of length 2cm and specific gravity=3 is kept suspended via a spring balance and is kept exactly half immersed in water. surface tension of water is 75 dynes/cm. find the reading shown by the spring balance. (contact angle = 0 degree. g=1000cm/sec^2) i got...

Heya folks at Physics forums. I'm having a bit of a problem with the theory of maths behind a simple formula used in F.M. This is purely a problem dealing with with mathematics rather than fluid dynamics. You'll have to excuse me, I really am a bit slow when it comes to these things, and...

Homework Statement A pure ice cube sits in water, floating. Prove that the water level will not change after the ice cube melts (meaning, the volume displaced by the cube will equal the volume of water added once the cube is melted). density of water = 1000 kg / m^3 density of ice = 920...

A cube of wood having an edge dimension of 20.0 cm and a density of 650kg/m^3 floats on water. a) what is the distance from the horizontal top surface of the cube to the water level? b)what mass of lead should be placed ont eh cube so that the top of the cube will be just level with the water...

I'm writing a major paper on fluid flow in vortices (think tornado) and the solutions don't generally exist at all. Truly original research is not required, but I want to give a rigorous proof of the Navier-Stokes eq, starting from the basic continuity equation, explain their assumptions...

Is there a book, series of notes, lectures, PDF, PPT or anything that contains all known complete analytical exact solutions of the Navier-Stokes equations?

Homework Statement The problem- http://img87.imageshack.us/my.php?image=physics4cw0.jpg Homework Equations Part of the problem is, I don't know which equations to use. (See below) The Attempt at a Solution Ok, I'm not quite sure how to approach this problem. It would help if I knew...

Hey guys, I am kind of confused here but can you guys define for me inviscid flow and laminar flow? In my understanding, inviscid flow is when viscous effect is very weak and laminar flow is when reynolds number is in general, less than 2300. In that effect, does that mean that viscosity for...

could anybody suggest me a book on fluid mechanics which provide strong basics as well as detailed knowledge thanks

Hi, What are good first texts in mass and heat transfer, material and energy balances, fluid mechanics and thermodynamics? I was recommended Felder and Rosseau, and Incropera and Dewitt. However, no books have been recommended for fluids and thermo and the consensus on amazon seems to...

What would you recommend as good texts. Here's what I've found searching the site: White Segel Tritton L&L Aris

Homework Statement Define:Static pressure Dynamic Pressure Continuum hypothesis Kinetic Viscosity Kinematic Viscosity 2. The attempt at a solution The real question is : are these answers sufficient? Static Pressure - The pressure exerted by a fluid on an object placed within the...

Does anyone have any ideas about this?

Hey everyone! I'm having difficulty and wondering if someone would be kind enough to help me figure out how to approach this problem. I'm a mechanical engineering student and reasonably new to fluid mechanics, and quite confused. :blushing: Thanks for any help anyone can give me :smile...