Fluid dynamics Definition and 609 Threads

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I have to sit an exam on non linear dynamical systems in a couple of weeks. Something that's been asked in the past is to name physical examples of different types of bifurcation. I've consulted Strogatz's book and the internet to try and find some, but I can't seem to find many (or even any)...

And by how much would the balloon expand, if at all?

I'm working with tap water. I'm building a fertilizer injection system, and need to control the rate that water flows through the bypass, through the fert tank, and back into the main line. At small flow values, reynolds numbers are on the non-flat part of the curve, so making something that...

What is the reason making this sound?? ( Rotary lobe pump)

Net Inlet Pressure Required (NIPR) is an individual pump characteristic, determined by test, of what pressure energy is needed to fill the pump inlet. How to generate the curve of NIPR or how to know NIPR of the pump if I am a pump manufacturer??

I explained this thinking to a meteorologist once and she couldn't give me an answer. Any physicists want to give it a shot? I find the typical explanation of tornadoes perplexing (that's a polite way of saying I don't believe it). The explanations I've seen claim that tornadoes start out...

<< Mentor Note -- thread moved from the schoolwork forums to ME for better views >> 1. Homework Statement Not really homework as this is for work. We are washing a cylindrical container (15.5 cm) with only one (1.8" dia) hole at the bottom the rest is sealed. Our machine sticks a .5" pipe with...

So I'm working on a method to allow control of a drop at different speeds. An idea my team had was to sit our test object on top of a piston, and drop the object by allowing the piston/plunger to drain out of a port at the bottom. We can't seem to wrap our heads around how the size of the...

Homework Statement Homework Equations because their is steady flow we only care about mass flow flux meaning m1vout - m2vout m = ##\rho##Av i know that m1 = m2 + m3 since there are no dimensions I am assuming that areas are the same everywhere, density does not change therefore velocities...

Hi all, I'd like to confirm my understanding on some things regarding pressure losses in a branched pipe for a project. Referring to the picture below I grabbed off from the net. (assume no elevation chan Would appreciate if someone can correct me if I'm wrong anywhere. 1) Total pressure...

Homework Statement ##\rho##water = 1.94 a = variable ##\gamma## = 1.94(32.2) = 62.4 Pressure outside P1 = 2116 lb/ft3 Temp = 75 F Pressure at bottom P2 = vapor pressure = 52.3 lb/ft3 Height = 6 inch = .5 ft Homework Equations -##\nabla{p}-\gamma\hat{j}=\rho\hat{a}## The Attempt at a...

Greetings, I have very little experience with fluid dynamics and I was wondering how I can calculate a pressure drop across an abrupt change in diameter of the piping used for water. Any help is appreciated! Thanks!

Hi guys, I'm trying to delve into compressible flow and in the various textbooks I'm reading I've found two school of thoughts when it comes to how to calculate the threshold (or error compared to incompressible flow) of 'M' when to consider a flow compressible. In Fundamentals of Aerdnyamics...

((((As a correction dissipation function in picture should have square of divergence of U)))) Hi, first of all I am aware that we have to discretize the non linear navier stokes equations to reach the almost exact solution, and pressure based or density based algorithms are deployed for that...

Hello, I'm trying to create a simulation of swimming "Animats" (artificial animal). However, I'm only an high school student, so I don't know how to deal with fluid drag and fluid dynamics. In this link you could find a short animation I made describing the swim motion my animat is going to...

Hello everyone, I am currently working on an undergraduate club team for the Intercollegiate Rocket Engineering Competition. I am attempting to do a calculation to determine the pressure needed in a vessel leading to another pressurized combustion chamber to achieve a desired mass flow rate...

I'm studying fluid dynamics and we just had a lecture about the momentum equation. We started the lecture by talking about pressure in terms of molecules moving across a hypothetical surface element and carrying their momentum with them (in both directions). There are 2 things confusing me about...

Homework Statement At a certain point in a pipeline, the velocity is 1 m/s and the gauge pressure is 3 x 105 N/m2. Find the gauge pressure at a second point in the line 20 m lower than the first if the cross-section at the second point is one half that at the first. The liquid in the pipe is...

Can laminar and turbulent flow be used to explain dripping blood? Be it blood dripping from a weapon/ impacting on an uneven surface?

This refers to the behaviour of cricket balls. Every cricketer in the world believes that a cricket ball "swings" more when the atmospheric conditions are cool and damp (as in the UK) as opposed to hot and dry (as in Australia). I have watched a bit of baseball and I have never heard...

Dear, Everyone I am a new member here, nice to meet you.. First, I want to introduce my self, I am a master student of physics and I am studying CFD right now. It's a new topic for me and I will also do my research about simulation of fluid dynamics related to CFD. Actually, I got this topic...

Homework Statement I have a syringe filled with water. This syringe is a cylinder with a length of 3 inches (L), diameter of 1.5 inches (D). Attached to the syringe is a constant force spring, which pushes the plunger into the syringe with a force of 2 pounds (F). Ignore the friction between...

Homework Statement Question: what rate does the water lose gravitational potential energy? Data: I have a pipe that water is flowing through and the pipe has 2 sections. In section 1: - the pipe is 11.9m above section 2 so, h = 11.9m - the velocity of water is $$v_1 = 0.3240ms^{-1}$$...

Homework Statement A tank of constant volume V contains air at an initial density pi. Air is discharged isothermally from the tank at a constant volumetric rate of Q (with SI units of m^3/s). Assuming that the discharged air has the same density as that of the air in the tank, find an...

Hi, I've been studying fluid mechanics for my mech. engineering degree for the past few months. Unlike my other subjects (mechanical analysis, thermodynamics, automated systems, mechanical vibrations), I can't seem to grasp the problem-solving technique. The annoying thing is, I find the...

So I did a project about a year ago and I can't remember one of the things I wrote in this equation. The equation apparently I got it from NASA's website. https://www.grc.nasa.gov/www/k-12/airplane/dragco.html This is my equation CD = FL/ (0.5 * Air viscosity * V^2 * Area) = 0.4These are the...

Homework Statement The vlasov equation is (from !Introduction to Plasma Physics and Controlled Fusion! by Francis Chen): $$\frac{d}{dt}f + \vec{v} \cdot \nabla f + \vec{a} \cdot \nabla_v f = 0$$ Where $$\nabla_v$$ is the del operator in velocity space. I've read that $$\nabla_v =...

Homework Statement Consider a spherical particle immersed in water. It will experience random collisions with the surrounding water molecules. Suppose there are such water molecules around the particle. Half (n/2) of the water molecules will push the particle to the right and the other half to...

a microchannel of length 2L and width h in the thermal cycling region. the temperature profile ...(1) the cyclic temperature profile leads to a time dependent density ...(2) using the mass conservation equation i.e. ...(3) and momentum balance equation i.e. ...(4) we have to find the exact...

Homework Statement Problem: https://imgur.com/a/ppDy6 Calculate the fluid speed at a certain point Given fluid and sound speed before the point Length of the conduct 2. Useful Equations: Uniformly accelerated motion(my solution) I have been studying this problem it for some time, have...

Good day folks! I am working on the simulation of an engine, and in particular the oil system makes my head ache. I already finished the calculations for viscosity and temperature, but now I'm stuck on coming up with formulas for pressure and flow rates. With what should I start? For...

i am an aerospace engineer and have good knowledge in fluid and gas dynamics and i want to study astrophysical fluid dynamics , should i study intro to astronomy and astrophysics ? and what are best books in astrophysical fluid dynamics ?

In an Inviscid fluid would the no slip condition exist? If it didn't would it follow that the free stream velocity would exist at the wall ?. If this was the case would surface roughness still present an orthogonal area upon which the kinetic energy of the fluid would interact causing a...

Hi Everyone, I am currently doing undergraduate program in mechanical engineering. I want to pursue masters after my B.Tech in the field of fluid mechanics and aerospace engineering.I want to know about the prospects of this field in the future research. Thanks in advance, Ritwik Kulkarni

Hi All, I am Ritwik from India and I am very interested in the area of fluid mechanics.Currently pursing B.Tech in Mechanical Engg. in IIT. I am currently doing my project in impinging jets. I want to explore and want to continue in the field for research in the graduate programmes. I want to...

I'm having fluid dynamics classes right now and I'm enjoying it very much (much more than my solid mechanics classes, by the way). Also, I do like programming and computer science, and CFD looks like a very interesting field. I'm developing a real interest for it. One question for those who are...

Hi, Our lecturer explained us the Reynold Transport theorem, its derivation , but I don't get where the - sign in control surface 1 comes from? He said that the Area goes in opposite direction compared with this system. I can't visualise this on our picture. Can you please help me understand...

Homework Statement Using the matricial form of TFD (discret Fourier Transform) calculated : X=Fd(x) for x=(1,0,2j,1-j)^T from K^4 Homework Equations X=wx The Attempt at a Solution I know the "x" matrix and the "w" matrix but i don't know how to find the "ω" variable from the "w" matrix...

There are some plastics I am using that when melted, pull apart in a stringy way. My best comparison is like melted cheese in a sandwich. I want to know more about this, but other than looking up 'polymer rheology', I'm not sure what I should call this type of flow. I want to know what causes...

Hey everyone! My name is Jing and I am participating in a one month summer program called SHAD where 800 high school students across Canada come together to try and solve some of the world's most multi-dimensional problems. One of the aspects of this program is the Entrepreneurial Project, where...

Hello everyone! I have seen several DIY projects which successfully gathered heavy water from normal water. For example Cody from codys lab used electrolysis to "enrich" the water. This however is a messy process. So i became curious, if this can be done easier by centrifugation. Based on...

Homework Statement In my book , i was told that when the drainage of surface is high then the surface runoff will be low . However , i don't think it's correct . Homework EquationsThe Attempt at a Solution Definiton : Runoff can be described as the part of the water cycle that flows over...

I am stuck on the questions, 5.3.10 and 5.3.11 which are part of a chapter on dimensional analysis in fluid mechanics by Streeter. Question 5.3.10 (see also the attachment): It asks me for the given fluid dynamic problems, where is the inertial force not important. It lists several fluid...

I have been involved in a fairly furious debate about a fluid dynamics experiment regarding the pressure of air passing through a tube attached to a moving car. It is similar in concept to the issue of whether or not an opening in an aeroplane fuselage would suck people out, where the opening...

Homework Statement Hi, I am doing physics lab on finding coefficient viscosity of fluids and how it changes by temperature by dropping a marble into fluids, finding terminal velocity, then using stoke's law to find viscosity. (using density of fluid, sphere, sphere diameter etc). The equation...

Hi All, Looking for some help (any is greatly appreciated). I've been tasked with the below, and am unable to find a worked example to cross check my work against. If anyone with a greater knowledge than me could have a look at the below and advise if I'm right the right track. Thanks 1...

Hello. I am inquiring about how a pressure difference between a hot room (roughly room temperature) and a cold room (roughly the temperature of a standard refrigerator) can cause a force inside the cold room when exposed to its hotter counterpart. More specifically, I would like to apply this...

Homework Statement More a report question but unsure where to put it. Take a 5mL syringe and a 10mL syringe (both filled to 5mL) with the plungers removed. Time how long it take to full drain each syringe Make a statement regarding your results. Homework Equations Fluid flow rate = volume /...

So I've noticed my little sister's helium balloons floating at the ceiling. Made me wonder if someone could create a device that could harvest energy from this buoyancy. What if I tied a very long rope to a huge balloon filled with helium, and rolled the other end of the rope to a gear attached...