Fluid mechanics Definition and 698 Threads

Hey guys, I'm working on a lab here about pressure variation normal to streamlines. For the last experiment, there is airflow around a cylinder with a static pressure tap. The pressure tap records Cp (divides by dynamic pressure) and angle of rotation. I have data points for Cp vs Theta (10°...

A cylinder is full of water, a ball is sinking vertically along the central height the cylinder (ie the centre of the ball is along the central axis of the cylinder) with a constant speed V ,if the radius of the ball is r and the radius of the cylinder is R (r<R), find the volume of water...

Homework Statement A polar bear partially supports herself by pulling part of her body out of the water onto a rectangular slab of ice. The ice sinks down so that only half of what was once exposed now is exposed, and the bear has 70 percent of her volume(and weight) out of the water...

[SOLVED] Fluid Mechanics Homework Statement You are designing a diving bell to withstand the pressure of seawater at a depth of 230. a) What is the gauge pressure at this depth? (You can ignore changes in the density of the water with depth.) got 2.32x10^6 Pa - masteringphysics said...

Hey guys, I've been at this question for a while so I thought someone might be able to help me. A 3m converging duct converges linearly, the inlet and outlet diameter's are 0.46m and 0.15m respectively. Also the volume flow rate (Q) is constant at all points in the duct and its value is...

Does anyone know about the parameters that affect the design of fan? For example, is there an optimum number of blades, or optimum curvature and shape for the blade? I suppose this has to do with fluid mechanics (which I know nuts)? Which particular equations am I looking for? Is there any book...

http://img90.imageshack.us/img90/9176/img062iz2.jpg I am having trouble starting excersize 3. If both jets have the same velocity,area, and the same density what would cause the cart to move? If they are mean that the cart is given an intial velocity and I need to give an expression fot the...

The Bernoulli Equation for non-uniform flows have a constant at the kinetic energy term which describes the velocity profile at that place. The problem is this, If a have water flowing through a pipe with a parabolic velocity profile and then the water exit the pipe at free jet and there is now...

Heat transfer and Fluid Mechanics, COMSOL Help Hello, I am trying to couple heat transfer and fluid mechanic together, model is a simple concrete slab (3'x6')with a water pipe beneath it and along 3' direction. For heat transfer, the heat flux will apply on the surface of concrete slab...

Homework Statement Show that the streamlines for a flow whose velocity components are u=c(x^2-y^2) and v=-2cxy, where c is a constant, are given by the equation x^2*y-y^3/3=constant. At which point (points) is the flow parallel to the y axis? At which point (points is the fluid stationary...

Homework Statement The velocity of the water in the pipe is given by v1=.5t m/s and v2=1tm/s, where t is in seconds. Determine the local acceleration at points 1 and 2. Is the average convective acceleration between these two points negative, zero, or positive? Homework Equations A...

Is there any valid formula which can apply to both thermodynamics and fluid mechanics, as they are both based on the nature of flow of a substance? If yes, please mention the formula and it's derivation?

Hi, I'm inrolled in a mechanical engineering program at my university and one of the main specialization areas and research areas here is fluid mechanics. I'm looking at doing this, I'm drawn to the complex physics and mathematics, and aerodynamic/fluid modelling and design looks fascinating...

Quantization and fluid mechanics?? Cant quantum field theory be applied to releativistic imcompressible fluids? cant the velocity vector field be quantized? will the pressure of the fluid play the role of the 4th component of the four vector? what would be the corresponding quanta? (I know...

Hi Everyone, Well, I just want to ask… Which of the following 2 Fluid Mechanics books is good for Beginner: Title: Fluid Mechanics, 4th Ed. Author: Irving Granet ISBN: 0133521702 Publisher: Prentice Hall Title: Principles of Fluid Mechanics Author: Andreas Alexandrou ISBN...

Hi, Does anyone know which of the following 2 Fluid Mechanics books the best is for beginner? FIRST Title: Elements of Fluid Mechanics Author: David C. Wilcox ISBN: 1928729177 Publisher: DCW Industries SECOND Title: A Physical Introduction to Fluid Mechanics Author: Alexander J...

Homework Statement a rectangular flat plate wing is considered for an aircraft.the aircraft needs to take off and land on a 1500 m long sea level runway and to cruise supersonically at mach no 2.5 at 8000 m altitude.assume aircraft weighs 16500kgf and max thrust of aircraft at sea level is 1/3...

hi i m planning to write a paper in classical mechanics.Anybody know of any open issues in fluid mechanics?

Homework Statement A sled slides along on the snow on a thin horizontal layer of water between the ice and the runners. The horizontal force that the water puts on the runners is equal to 1.2 lb when the sled's speed is 50 ft/s. The total area of both runners in contact with the water is...

I am new in this place, am studying civil engineering in Spain,Madrid, and is something I do not understand in a theoretical exposition of the velocity/force potential. They suppose that the external force that it acts in each point of the fluid and the speed, derive from scalar , so they...

Hey, I'm working on programming a Newtonian mechanics engine (not as part of coursework, btw, for a game that I'm making). I have some problems, however, as to how to approach fluid mechanics. I know a little bit: buoyant forces, specific gravity, and such. However, I just do not get the...

Hi, I'm just trying to get a feel for a subject that I plan to take but I'm unsure about the meaning of a certain term which frequently arises. The term 'flow' comes up a lot and I'm wondering what it could mean (or refers to) in the context of a pipe flow problem. I know my question is vague...

There is a u-tube which its diameter on the left hand side is smaller than the right hand side. It is filled with liquid. As the atmosphere pressure is equal in the two side, and force = pressure*area. I want to ask, why the liquid in the u-tube is not pushed to the left side as the force...

Problem: Consider two identical ships, one loaded with a cargo of cork (which floats), and the other empty. Which ship displaces more water? My answer: V=V m_1>m_2 and, \rho_1=\frac{m_1}{V} \rho_2=\frac{m_2}{V} so, \rho_1>\rho_2 \rho_1 displaces more water because the mass added...

A particle falls in water and reaches its terminal velocity. if the density of the particle is 1100kg/m3, what is the velocity and diameter is Re = 1.0 Again guys bit lost with this one, there are so many different equations relating to this i don't know where to start. hopefully some one...

The question is as follows: Determine the maximum velocity at which the poiseuille Equation may be used for a) water flowing in pipes diameter 0.001m, 0.015m & 0.20m, stating f, pressure drop/length in each case. b) Re-work question a) using air instead of water. I am a bit confused as...

I'm looking for a good Engineering Fluid Mechanics textbook. Any suggestions?

Fluid Mechanics: Flow Between Parallel Plates--Force Balance Equation Homework Statement http://antishift.org/image.php?id=16807&size=full Homework Equations I know the equation for shear, tau=viscosity*velocity gradient. and pressure is obviously force/area. The Attempt at a Solution I...

In the equation P = P *sub*atm + pgh what is the "g"? gravity due to earth??

Can someone help me with this proof

Problem: A water tank develops a leak 20 meters below the surface of the water. The tank is 20 meters above the ground and the hole leaking water is 0.5cm in diameter. How far from the tank will the water hit the ground? I used P1 + (1/2)(ρ)(v1^2) + ρgy = P2 + (1/2)(ρ)(v2^2) + ρgy I then...

At ground level in Denver, Colorado, the atmospheric pressure and temperature are 83.2 kPa and 25 degrees Celsisus. Calculate the pressure on Pike's Peak at an elevation of 2690 m above the city assuming an incompressible atmosphere.

Fluid Mechanics: Point like "sink" I am badly badly confused by the following problem and its solution. I hope that someone would be kind enough to help me out! Thank you for your help and your time!:smile: 1) The plunger of a hypodermic needle (a point-like "sink") is being pulled up with...

I don't understand the idea of apparent weight (see example below). Can someone explain? Thanks a lot! 1) You need to determine the density of a ceramic statue. If you suspend it from a spring scale, the scale reads 28.4N. If you then lower the statue into a tub of water, so that it is...

I am having great trouble understanding this problem and the way to solve it, could anyone explain in detail? Any help is appreciated!:smile: 1) An aquarium tank is 80cm long, 30cm wide, and 35cm deep and is filled to the top. What is the force of the water on the bottom of the tank, with...

I think that my textbook has too little example questions on this topic illustrating the concepts, so I have some confusions when I attempt to solve the following problems for practice. I hope someone would be nice to clarify such concepts. Any help is greatly appreciated! 1) River A with a...

Were there some tests of this kind? Would that have some meaning? Would the fluid world be very strange if the EP was (somewhat) in default? Some brainstorming on fluid mechanics and the Equivalence principle, to take another point of view? Thanks, Michel

Homework Statement Medium lubricating oil, of specific gravity 0.860, is pumped through 300 m of horizontal 50-mm-diameter pipe at the rate of 0.00114 m3/s. If the drop in the pressure is 200 kPa, the absolute viscosity of the oil in N×s/m2 is...____________? specific gravity (SG) = 0.86...

http://www.see.ed.ac.uk/~johnc/teaching/fluidmechanics4/2003-04/fluids3/syllabus.html#syl3 Nice set - but parts seem to be missing References Tritton D.J. "Physical Fluid Dynamics" Clarendon Press, Oxford. 2nd ed 1988 Welty, Wicks & Wilson "Fundamentals of Momentum, Heat and Mass...

A water tank is open to the atmosphere and has two holes in it, one .80 m and one 3.6 m above the floor on which the tank rests. If the two streams of water strikes the floor in the same place, what is the depth of water in the tank? (Assume that the holes are very small and the tank is very...

Someone recommend a Fluid Mechanics text for an introductory course. And to understand the position I am in at the moment bad professor, TA and text ( Fluid Mechanics by Frank M. White) My library has a few old fluids text, and the ones I flipped through were Fundamentals of Fluids by...

Not really a homework problem, but I'm having a hard time with this section. It's mostly dealing with the horizontal component of the force. This is from my book, Fluid Mechanics by frank m white 5 th ed, "The horizontal component of force on a curved surafce equals the force on the plane...

I'm having problem understanding this one, can clarify and help answer? A material region is defined as one where the surface velocity W is everywhere equal to the fluid velocity V. Such a region always contains the same fluid. Is it possible to define W in a less restrictive way and still...

The problem and solutions is here http://img206.imageshack.us/img206/6093/problem1rm4.th.png Isn't the shear stress for both the inner and outer negative? When i take the derivative i get negative. The derivative is basically ln ( 1/x) since the rest are just constants. Edit: I meant that...

Hi... Suppose we consider a circular cylinder moving with constant velocity U in x-direction in a two-dimensional unbounded, irrotional, incompressible, inviscid fluid. If the motion of the fluid is completely resulted from the motion of the body, we know the velocity field of fluid can be...

Hi... Suppose we consider a circular cylinder moving with constant velocity U in x-direction in a two-dimensional unbounded, irrotional, incompressible, inviscid fluid. If the motion of the fluid is completely resulted from the motion of the body, we know the velocity field of fluid can be...

A U-shaped tube, open to the air on both ends, contains mercury. Water is poured into the left arm until the water column is 20.0 cm deep. How far upward from its initial position does the mercury in the right arm rise? So far, this is my work: Using pressure = density(water) x g x...

Hi. i am trying to brush up on my fluid mechanics for when i do it next year at uni. do any of you guys have any idea how to solve the follow question? 'A suction pump moves water from a reservoir to a holding tank. The system is designed in such a way that the suction pump is inclined...

Hi all! I always come across "scaling" in various subjects. Like in Fluid mechanics, I am confused about why there is a need to choose some characteristic scales and non-dimensionalize the differential equation? I am confused about this...can anyone expain me the rationale behind this...

Ok I have a question that I am stuck on which is about forces on plane areas. I can do the questions ok where the water acts aboce the gate but in this case the water acts below it if you get what i mean. Can someone please give an explanation of the approach to this question and how you do it...