Stream Definition and 159 Threads

Homework Statement I know that the following problem is really long but bear with me. The questions I have are quite simple. The problem: Calculate the speed profile of an inviscid fluid around a perturbated cylinder. The radius of the cylinder is given as $$r=R(1-\varepsilon \sin ^2 \Theta)$$...

I don't know much about particle physics, but out of curiosity I was wondering what would happen if a stream of electrons hit a conductor, say copper plating, an would it be detectible?

Example video I made a few years go: Note that most of the air interacting with the ball flows around the ball, as demonstrated near the end of the video where a tube is used to prevent flow around the ball, causing the ball to shoot upwards. The main point of this post is the explanation...

Homework Statement In still water a boat travels at 6km/h. A stream is flowing south at 4km/h. Calculate the time it would take for the boat to travel directly across the stream and back if the stream is 1.5km wide Homework EquationsThe Attempt at a Solution

Good morning, I always walk on egg shells posting what is probably a redundant question on a forum. I have been reading for two days and there is a ton of physics information out there on the subject but most of it doesn't truly address the mechanics of what I am looking for. In a very...

Homework Statement Daphne goes to the kitchen for a glass of water. She turns on the faucet so the stream of water is laminar flow. She notes that the diameter of the water steam decreases with distance below the faucet assuming that the water exits the faucet of diameter D with speeds v0...

Just saw this. "Learn inflationary cosmology from the guy who invented it." Live stream Friday, 10/31, at 2pm EDT (11am PDT) here: http://new.livestream.com/accounts/4044190/AlanGuthLivestream

I'm trying to solve the case of a fluid flow inside a tube using CFD fluent solver with convective bc for fluid side surface of the tube. As the boundary conditions take both inlet and free stream temperatures along with velocity at the inlet, i am confused with values of to be given for inlet...

Is there a program i can use or do i have to create one? If so,is it even possible?

Hi, I am studying fluid mechanics and I am trying to get to grips with slip and no-slip boundaries. I know that: Slip ---> Occurs when fluid is inviscid so no viscous stress at boundary. No-slip ---> Viscous effects mean the the tangential velocity must be zero, relative to the boundary...

Hi, I have a 1m long, 10mm ID vertical tube attached to a vacuum system. I have a known flow rate of the air down the tube which is used to calculate the air velocity. My question is if I then add micrometre sized particles (initially at rest) to the air stream what is their velocity at...

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 are some chemical or physical properties that are typically measured in a process stream ?

Homework Statement Hi The stream function for a cylinder with radius a in a uniform crosswind is given by (https://en.wikipedia.org/wiki/Potential_flow_around_a_circular_cylinder#Stream_function) \psi = Ur \sin(1-a^2/r^2) How does one show this formally?

Homework Statement Ten kmol per hour of air is throttled from upstream conditions of 25°C and 10 bar to a downstream pressure of 1.2 bar. Assume air to be an ideal gas with Cp= (7/2)R. (a)What is the downstream temperature? (b)What is the entropy change of the air in J mol-1K-1? (c)What...

Hi! When you are calculating ##\psi## or ##\phi## from the horizontal or vertical velocity components of a fluid's velocity, you end up with a constant ##C## carried along with the function. In my class, the professor just said something about them being arbitrary (I think..) and set them to...

Hello. My friend said a truncated cone that is the upside down (the hole is open downwards) may be held in the air by a stream of water... How? It is really true? Ok, consider a constant mass flow of water. How can I create a formula, which tell how high I have to place the cone? - (I want to...

Hi there, So I'm asking this in reference to the injection of insulin, which is commonly done subcutaneously (in the hypodermis, a fatty part of skin). Now I know proteins usually get into the blood when digested through the stomach/intestines - but I was wondering how they manage to get into...

Homework Statement Problem 12.20 Homework Equations The Attempt at a Solution For this problem, I am having a hard time getting any values for the streams, so I am stuck at stream G and K and can't figure out how much is going into G since I don't know the liquid recycle stream. I...

Hi all, I am working on a prototype and I have a question that I am not sure how to answer, thus the reason I am here. I have a piece of 4" pipe that I will vertically mount and I am reducing down to 1". Inside the tubing I have a racquetball. I am going to be sending air through the...

In this video at 7:15 you see a rifle fired underwater: https://www.youtube.com/watch?v=cp5gdUHFGIQ Apparently even before the bullet leaves the barrel, you see a cavitation trace coming out. The author explains it with the water being pushed out of the barrel by the bullet, forming a...

I keep confusing myself on this question, basically i want to know how you would determine the amount of potential energy you could capture by using a turbine, if water is flowing down a pipe into a river. The change in elevation from the start to end of pipe is 30 meters. The pipe is 100...

An electric current going through a wire generates a magnetic field as per the right hand rule. Will a pencil stream of electrons traveling in a vacuum at near light speed also generate a magnetic field--??----Also, what would a hypothetical observer traveling at the same speed and direction as...

Homework Statement Consider a stream of water flowing from a kitchen faucet. At the mouth of the faucet, the diameter of the stream is 0.960 cm. The stream fills a 125 cm^3 container in 16.3 seconds. Find the diameter of the stream 13.0 cm below the mouth of the faucet. Homework...

I am currently attempting to determine the amount (mass) of water that is condensing during a temperature change inside of a heat exchanger. Inititial Temp is 300°F, Initial Pressure is 19.696psia (5psig) in the air stream, Initial %RH is 5%. Final Temperature is 129°F and becomes 100% RH at...

Okay bear with me here because this might get disgusting. But I was watching Henry's video on how astronauts went to the bathroom in space, and basically they did it in a bag, and shot the bag outside into outerspace. And then he mentioned that the trajectory would change(but extremely small yet...

Hello, I'm having a bit of trouble converting an 8 bit stream into a 10 bit one. First i create intvalbin8, a Nx8 zero/one array where N is the byte length of the input data: (6198 is the header offset factor) j=1 do while (intvalout(i).gt.0)...

$$ \vec{E} = -E\cos\theta\left(1 + \frac{2a^3}{r^3}\right)\hat{e_r} + E\sin\theta\left(1 - \frac{a^3}{r^3}\right)\hat{e_{\theta}}. $$ How can I plot this in Mathematica?

Homework Statement I tried to reach the Bernoulli principle this way: Two pipes are connected, one has a cross-sectional area of S_{1} and speed of v_{1}; S_{2} and v_{2} for the other. The pipes are horizontal, the connecting wall between them at the crossing from one pipe to the other is...

A stream of protons and electrons are shot horizontally (from the left edge of the page to the right) with a speed of 1.2 x 10^6 m/s. A magnetic field is oriented perpendicular to this motion (upward, out of the page) with a magnitude of 1.225 T. What is the radius of the curvature and the...

Homework Statement A boatman wants to cross a canal that is 3 km wide and wants to land at a point 2 km upstream from his starting point. The current in the canal flows at 3.5 km/h and the speed of his boat is 13 km/h. (a) In what direction should he steer? (b) How long will the trip take...

Quick question. With electric current flow thru wire, the "right hand" rule indicates direction and position of the induced magnetic field. With a flow of protons in one direction, would a magnetic field be induced, and would a "left hand" rule be appropriate to describe this magnetic field...

Hi, I am trying to understand side stream filtration. Iv been finding it really hard to find out anything on preferential flow (multiphase) through a side stream using a valve to create a pressure drop (general info for my understanding) Im trying to do this without the need for a...

Homework Statement I'm currently doing some thermodynamic analysis. I don't know where to put this question, but here goes: I have a system that has two streams entering a condenser, and one leaving. I don't know mostly anything about two of the streams. One stream I have fully defined...

I'm thinking about building a generator for my parents powered by a stream in their backyard. It would be a great way to learn about science. I'm trying to find the relevant equations so that I can estimate how much energy the stream produces. Right now I have this equation: ε = NBAω...

Hi, I'm new to the forums, and I have a question. Here's the scenario: Let's say I have a circuit in a vacuum chamber with a current i, that flows through it and a constant voltage source and resistance in the circuit. One section of the circuit is a piece of gold (or any other conductor)...

Homework Statement A fisherman is sailing up-stream; when passing under a bridge, he drops a boat-hook in the water. After half an hour he discovers this, turns back, and overtakes the boat-hook 5km below the bridge. What is the speed of the current if the fisherman rows at the same speed up...

why stream of water blown in upward direction spread like a fountain. I failed to explain it can you please help. -

Homework Statement Figure 2-21 shows a general situation in which a stream of people attempt to escape through an exit door that turns out to be locked. The people move toward the door at speed vs
3.50 m/s, are each d
0.25 m in depth, and are separated by L
1.75 m.The arrangement in...

Homework Statement An α (Alpha) particle consists of two neutrons and two protons bound together into a single particle with a charge of +2e. We normally measure the kinetic energy of such particles in millions "electron volts" or MeV. (1 eV = 1.6 X 10-19J). Assume a steady stream of α...

Homework Statement Consider a cylindrical tank filled with water with 2.5-m depth. The water emerges from a small hole at the center of the bottom, as shown in the figure. The diameter of the hole is 1 mm. The cross-section area of the vertical water stream decreases as it falls. Find the...

I very recently started watching Al Jazeera's live English language news feed and I have now been shocked twice. The following is based on a relatively small amount of information/evidence and that is the reason for the question at the end of this. First, I was absolutely amazed to find...

I don't understand why stream tubes exist. Stream tube is defined here: http://www.princeton.edu/~asmits/Bicycle_web/streamline.html Why can't you have a stream line starting at a point going one way, and then the stream line at the neighboring point going some orthogonal direction, and thus...

http://img508.imageshack.us/img508/3161/pressure1.jpg Say I put my hand slightly above the middle of this air-flow producing machine that holds the ball up. Where would I "feel" it affecting more force on my hand, on the middle, or on the sides? I'd imagine on the sides, right? Even...

Homework Statement Consider a velocity field where the radial and tangenetial components of velocity are V_r=0 and V_theta=cr, respectively, where c is a constant. Obtain the equations of the streamlines. Homework Equations x=rcos(theta) y=rsin(theta) The Attempt at a Solution I...

Homework Statement Given the following stream function: ψ=C(sin(theta)/r) Find the radial and tangential velocity components. Homework Equations ? Don't know any The Attempt at a Solution Absolutely no idea how to even begin. Do I take the integral or something? Any help...

As we learned in fluid mechanics, we can devise stream function psi when the flow is 2-D, incompressible. However, I cannot clearly explain why psi can be defined only for 2-D, mathematically or logically. Is there any way to explain this, more than just say that 'just as it is'?

So the other day I was thinking about this problem that arose when I was watching water spiral down a bowl shaped drain. If you can imagine a spherical shell and on the inside there is a fluid stream that is tangent to the interior curvature of the wall. The entrance of the fluid stream is at...

I want to make an RC car that I can control in two ways. One would be over local wifi and I am actually watching the car and controlling it with my iPhone using touchOSC. The Arduino is using the http://asynclabs.com/" to connect to the wireless network at home or Ad-Hoc when no network is...

Hi everybody, I have been looking for a way to calculate the stream function if I know the velocity \vec{v}=(vx,vy,0) of a bidimentional flux. From the formula given for \vec{v}, I know it is an incompressible fluid.