Typical box fan+air filter setups use axial consumer-grade fans designed for providing maximum air flow at low power consumption. These fans do not provide sufficient air flow at the high static pressure requirements typical of air filters. The air filters DIYers use are high Merv(e.g Merv 13)...
I’m currently studying Fluid Mechanics, during an analysis I came across this
We now consider an example that combines centrifugal force and gravity: a liquid in a drum (centrifuge) rotates with constant angular velocity ##\omega## about a vertical axis. The centrifugal force per unit of...
These are the images from Sommerfeld’s Lectures on Theoretical Physics, Vol 2 chapter 2, section 6, Equilibrium of Incompressible Fluids.
Image 1
Image 2
Doubt 1 : What does it mean for a force to act on a fluid volume? Force acts on a point, force may act on a surface but I’m unable to...
I am working on a project where I have to calculate various results relating to the motion of a water bottle rocket being launched. I am currently stuck on trying to find how long the thrust period of the rocket is. The model for the rocket is as follows: It is a 2L (0.002m3 bottle filled with...
I know how to derive the formula, but I have no idea how to actually use this. Where it says ##50~cm## wide, I'm not sure if that's in the x-direction or the z-direction. ##W##, the width in the equation, is in the z-direction. ##\mu## can be calculated, but I'm not sure what the pressure...
Summary:: In need of help determining the exhaust velocity of a rocket nozzle given temperature and propellant molar mass
Greetings and salutations! My name is Robert DeVries, world builder extraordinaire. I have come with questions in search of answers.
So for the last few days I've been...
Hello there, im trying to analyze an impeller i found at home (small one) so i can find the torque-speed graph. The thing is that i get stuck in an equation with 3 unknowns instead of 2 and i dont know what else to assume.
My approach is as follows:
I take the usual equation: ## M = \dot{m} (...
Some thoughts that I've had on the question are saying the volume flow rate (##Q##) in, must equal the volume flow rate out. If that's the case, then:
##Q_{in} = Q_{out}##
##A_1V_1=A_2V_2##
But... no areas have been given. And height doesn't enter this equation at all.
Then I thought it...
I feel there is a really obvious flaw in my logic but i cant pin it down
So i have to find the thrust on the lamina which is basically force of bauyancy
F(bouyancy)= Vρg
Now volume of the triangular lamina is its rea into its hieght.
v = Ah
hence
F = Ahρg
some information i feel i didnt...
Hi all!
I have started reading Fluid Mechanics at my own pace (no university study)
and really I would like to grasp the ideas behind it.
So I have Fluid Mechanics by Cengel - 4th edition.
At page 45 the coefficient of compressibility or bulk modulus of elasticity (κ) is introduced.
##κ =...
Homework Statement
Water is supplied at 4.50 m3/s and 415 kPa (abs) to a hydraulic turbine through a 1.0-m inside diameter inlet pipe as indicated in the figure. The turbine discharge pipe has a 1.2-m inside diameter. The static pressure at section (2), 3 m below the turbine inlet, is 25 cm Hg...
They found an underground lake on Mars last week!
Given that the lake exists and is actually liquid (and has a surface), two obvious questions come to mind:
1. Will I be able to beet my earthly current record in bouncing a pebble there?
2. If I release a pebble from a given height here and...
Hello everybody,
I hope you are doing fine. I'm currently designing an injector for a hydrogen peroxide - ethanol engine, and the following formula is confusing me:
Q = Cd * A * sqrt( 2 * dP / rho); where Cd is the discharge coefficient, A the total area, dP the pressure drop, and rho the...
Hello everybody,
This is my first post. I've been working on a liquid rocket engine for a while, but I have never gotten to work on its feed system (fluid mechanics), until recently. We are using a very simple pressure fed system, and its main goal is to deliver the propellants at a specific...
Homework Statement
I have a situation as illustrated by the image above, where the red box illustrates the CV. The pressure on the left side of CV is P1, while the pressure on the right side of CV is P2. Here I´ve directed the pressure forces acting inwards on CV. The problem arises with...
Homework Statement
[/B]
A 25-cm-diameter, 100-cm-high cylindrical container, (as shown), is partially filled with 75-cm-high liquid (density = 900 kg/m3). Determine the rotational speed at which the liquid will start spilling. Calculate the gauge pressure at the centre of the bottom of the tank...
What will be the area of common surface of two identical bubbles of radius R , i know there common surface will be flat as the radius of curvature of comman surface will tends to Infinity , but how do i relate with area of flat surface
I tried to use
Energy = Surface tension * area
And then...
Homework Statement
Can anyone please give me hard and interesting problems regarding fluid mechanics problems such as hydrostatic and air prssure bouyance force and Bernoullis equation(Bernoullis equation problems only for liquids)? I tried looking for them but the ones I found were quite...
Homework Statement
When completely hollow. To what fraction of volume should water be poured into it so that it is just enough to cause the sphere to sink. [/B]
Homework Equations
Archemedes : Buoyant fource equals weight of water displaced
The Attempt at a Solution
Let's first find the...
Homework Statement
Hydrostatic force on a plane surface ex:
Hydrostatic force on a gate:
Homework Equations
The Attempt at a Solution
why cant we just use the formula in the red box above for problem 3.57?
instead I have to use integral
I am confused, how does this gate different from a...
Homework Statement
Homework Equations
τ= η* (dv/dy)
The Attempt at a Solution
so
dA= 2π* r * dr
T = ∫ τ * r * dA
T = ∫((0.01* r* 2*π * 450 /60)/(5*10^-3) ) * r * 2π* r *dr
= (592.1762)*(r^4/4)
T = 0.11 Nm
is this correct?
I am working on problem that has to deal with a jet ejector. For the life of me, I cannot figure out the E-Balance equation for it. Below is a cut away image of the ejector. The fluid is the same so using the ideal gas law I do not think should be included. Any help is greatly appreciated...
Daniel Barton
Thread
energy balance
fluidmachanics
thermodyamics
venturi
Homework Statement
I have problem of obtaining the cross sectional area .
Homework Equations
The Attempt at a Solution
Taking section 2-3 as an example , my working is [ (3.3 +4.8) / 2 ]* 5 = 20.25 , but the ans provided is 29.28 , how to get the 29.28 ?
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 dont think it's correct .
Homework Equations
The Attempt at a Solution
Definiton : Runoff can be described as the part of the water cycle that flows over...
Homework Statement
When a part of the channel is constricted , why will the Emin = Eo ?
Homework Equations
The Attempt at a Solution
I just have the figure showing in case 1 and case 2, Emin = Eo without any explanation ... Can someone explain about it ? I tried to search many online...
Hello everyone!
Summer is coming and instead of buying a $200-$400 air conditioner, I'd figure I could try a DIY version. I came up with a schematic (attached below) and how I think it would work. I feel like I'm missing something blatantly obvious that will make it not feasible. Wondering if...
Homework Statement
Determine the depth of the flow of channel if the best hydraulic channel is needd for composite channel in figure to convey flow rate of 6.5(m^3/s) , Manning coefficient n on bed slope are 0.015 and 0.0015 respectively .
Homework Equations
The Attempt at a Solution
I...
Is there any entropic gain when the surface of a liquid is minimised? Per example, molecules "enjoy" maximum entropy when they are at the interior. Is this valid?
I am graduate student from structural mechanics of solids and need to learn 1 course from fluids and thermal group which includes fluid mechanics or thermodynamics+heat transfer. I am unsure which one would be better to learn, especially which would be helpful in future for solid mechanics. Can...