My relative tried to blow debris and dust out of the engine compartment of my car. The air can was tipped downwards at one point and a small amount of the fluid spilled out onto the the plastic tray which normally holds the battery (which was removed at the time- see picture below). The area of fluid was about 2" in diameter.
It evaporated quickly. I didn't know what to do so I took a series of wet paper towels and wiped the area really well, then left it to dry.
I need to put the battery back in the car tomorrow and, at some point, run it. I'm lowkey scared, will it explode/catch fire/etc? There are lots of warnings on the compressed air can about flammability. What about if the engine gets hot while driving? Thank you...
Here is a picture that is sort of representative of my battery. There is a tray, and a battery, the fluid spilled on the tray so it would be sandwiched between plastic.
https://preview.redd.it/v0cotym7qoc71.jpg?width=1024&format=pjpg&auto=webp&s=bbb169a0dab0afee08936a50c9827033851855fc
Here is a link to the product:
So today I saw there was quite a bit of dust in my case and it's been about month since my last cleaning so I popped out the cleaning supplies and went at it as I was on the graphics card I slightly turned the can ( ik bad move keep it up right) and fluid came out i thought I'd finish the job and see what happens. I try it out later and boom all my games freeze as soon I start them and the screen looks fuzzy. Is there anything I can do about this? Has anyone seen this before?
Assuming it would still combust, of course.
The compression takes some energy, so it must offer more benefit energy than the compression takes, so where does this extra (?) energy come from?
Did a search, but couldn't find anything. How in the heck does this work??
https://i.imgur.com/bsLF3sV.gifv
And here's another example...
http://i.imgur.com/vlfrazt.gifv
Can't for the life of me figure out how this could possibly inflate the tire.
Hey all, we have a hydraulic system which needs to provide some give. Currently using accumulators but hoping to simplify the system with a compressible fluid. I've seen some references to silicone oils, but haven't found any details. Anyone able to point me in the right direction for what exactly I'm looking for, or where to buy some? Thanks!
If I have a known volume of a viscous liquid placed between two parallel glass plates in a cylinder and then put a weight on the top for 1 minute, what are the forces involved? If I then measured the diameter of the resulting "circle" of the liquid, does this correspond to a know property of the fluid (e.g. the viscosity?)
Image to help visualise what I'm asking.
This wasn't set as homework by any class so I can't state the level of work, more of a thought experiment, but I didn't know where else to post for some help.
I have very little knowledge of fluid dynamics but have felt inspired by a recent undergrad university course to experiment and learn some more about it. I thought the best way to do this was by running a discretised simulation. I particularly wanted to achieve this using a kernal-convolution method to see if it could be computed efficiently.
The following is a method I have been experimenting with, however it causes the magnitude of flow velocities to exponentially increase and I'm not sure why (as well as negative densities and negative temperatures occurring).
My course is on incompressible flow so I have naΓ―vely (and likely wrongly) adapted these equations for compressible fluid driven by temperature. I've had a search online and have been struggling to find any literature on a kernal-convolution approach. Therefore I would be grateful for any feedback on where I have gone wrong, whether it be the method or an incorrect derivation I've used. Derivations can be found at the bottom of the post.
Variables:
$u_i\equiv u_i \left(t\right)$ is the ith component of the fluid-velocity of the grid cell, whilst $\vec{u}$ is the full vector
$\varrho \equiv \varrho \left(t\right)$ is the density of the grid cell
$T \equiv T \left(t\right)$ is the temperature of the grid cell
$c$ is the specific heat capacity
$\alpha$ and $\kappa$ are arbitrary diffusive factors for temperature and density respectively
$\mu$ is the viscosity
Ξ³ is an arbitrary factor from the ideal-gas law
Method:
1.Fluid-velocity update step (eqn. 1)
$u_i\left(t+\mathrm{d}t\right) = u_i + \left(F_i +\frac{\mu}{\varrho}\nabla^2\left(u_i\right)-\frac{1}{\varrho}\frac{\partial}{\partial x}\left(\gamma \varrho T\right) - \vec{u}\cdot\nabla u_i \right)\mathrm{d}t$
- Temperature update step (eqn. 2). I'm unsure what the second term means physically, it was a result of the chain rule - any interpretations would be appreciated.
$T\left(t+\mathrm{d}t\right) = T+\left(\underset{\text{Diffusion}}{\underbrace{\alpha\nabla^2T}}+\underset{\text{?}}{\underbrace{\frac{T}{\varrho}\nabla\cdot\left(\varrho\vec{u}\right )}}-\underset{\text{Convective}}{\underbrace{\frac{\nabla\cdot\left(c\varrho T\vec{u} \right )}{c\varrho}}}\right)\mathrm{d}t$
- Density update step (eqn. 3)
$\varrho\left(t+\mathrm{d}t\right) = \varrho+\left(\kappa\nabla^2\varrho-\nabla\cdot\left(\varrho\vec{u} \right ) \right
... keep reading on reddit β‘I found a small amount of brake fluid/sludge around my piston when inspecting my brakes (I made another question that was related but different).
The amount was small and absorbed into the brake/rust dust, such that it was not really wet but just sludge like. I was concerned there was a leak.
About 8 months ago I did the pads and rotated/compressed the piston in. When doing so the boot twisted and bulged a little. Is it possible (normal) that fluid leaked when compressing the piston, and filled up into the boot. I am wondering if this is what this sludge is from.
This morning I thoroughly cleaned the piston and boot such that is was flawlessly clean. I then went and mashed the brakes with the car on while parked with both feet probably 10-15 times. I then went and inspected the piston around the boot and saw no fluid.
Is it possible that the piston leaked when compressing it, and I don't actually have a leaking caliper?
Whatβs the difference between the eqs to compressible and incompressible? What are the assumptions to compressible? Variable density?
Hi all,
I am looking to simulate an interesting scenario where solid melts into a liquid and the density of the liquid is much smaller than the solid so the fluid now takes up a greater space. Furthermore, a compressible gas is above this liquid in a closed container and is being compressed by this fluid.
Maybe I don't know where to start, but here are the multi-phase solvers in OpenFOAM: https://www.openfoam.com/documentation/guides/latest/api/group__grpMultiphaseSolvers.html
I could do without the compressible gas and simulate the liquid expansion maybe with a dynamic mesh if that is more possible. I'd appreciate any thoughts or guidance you guys have.
how can a find the velocity o the wave if the only given is that p=Asin[(2Ο/l)(x1-ct)] the added pressure.
I have never worked on anything like tha before so any help will be great.
So imagine thereβs a pipe and it is wide at one end and narrow at the other. Now using the equation of continuity, we know AV=constant therefore velocity of fluid will be more in the narrower part. Now since the velocity is more in the narrower end, I would assume that itβs also exerting more pressure on the walls of the pipe and as the flow of fluid is slower in the wider part, the pressure would also be less. Also Pressure = Force/Area hence pressure is inversely proportional to area, which would further support my argument. But clearly, this thinking is wrong. I think we would use Bernoulliβs principle here to determine the pressure relationship but I canβt figure out how to do it. The only thing I know for sure is that pressure WILL be more in the wider part and less in the narrower part. Now I just need an explanation for this.
