Insights Blog
-- Browse All Articles --
Physics Articles
Physics Tutorials
Physics Guides
Physics FAQ
Math Articles
Math Tutorials
Math Guides
Math FAQ
Education Articles
Education Guides
Bio/Chem Articles
Technology Guides
Computer Science Tutorials
Forums
Trending
Featured Threads
Log in
Register
What's new
Search
Search
Search titles only
By:
Menu
Log in
Register
Navigation
More options
Contact us
Close Menu
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Forums
Physics
Classical Physics
Mechanics
Centripetal Force and Pascal's Principle
Reply to thread
Message
[QUOTE="Timtam, post: 5580652, member: 532207"] Thanks AT I think that was a very good clue, I managed to find a few articles that mention that the no slip condition relationship to Momentum balance [MEDIA=youtube]brE-62QvuX4[/MEDIA] The summary of the video is that the fluid molecule 'sticks' to the solid wall long enough to achieve thermal equilibrium . Irrelevant of the momentum it possesses when it arrived (which has been absorbed as heat) When it leaves its Momentum is completely[I] 'funded'[/I] by the random degrees of freedom nature of heat . As such all tangential components will cancel out A rather more verbose explanation is below - [PLAIN]https://www.researchgate.net/post/Can_someone_explain_what_exactly_no_slip_condition_or_slip_condition_means_in_terms_of_momentum_transfer_of_the_molecules[/PLAIN] with what I think are a few key phrases highlighted [I] "On the microscopic level the wall consists of billions of billions of interacting, vibrating atoms; their average speed is counted in hundreds of meters per second, and their vibration is pretty chaotic, though centred about some positions in space: that's why the walls appear to be "solid". Liquids and gases also consist of billions of billions of molecules whose average speed is roughly the same as that of the vibrating wall atoms (hundreds of meters per second), but their average position is free to change. That's why than can "flow". [/I][B][I]Thus, if a single fluid molecule hits the wall, it can be "reflected" in essentially any direction[/I][/B][I]. What really matters is the AVERAGE fluid particle velocity near the wall. [/I][U][I]The collisions are always ellastic in that they conserve the total energy of the colliding molecules; however, this does not preclude energy transfer from one particle to the other[/I][/U][I]. [/I][B][I]Sometimes the energy comes from the wall molecules, sometimes toward the wall molecules. The same concerns the momentum[/I][/B][I]. The wall molecules can then immediatelly transmit this energy/momentum to other molecules that make up the wall. The point is that the mean position of each wall molecule is fixed in space. Hence, the mean position of the fluid particles near the wall should be also very close to zero[/I] Are these explanations a good summary as to how ordered momentum collision containing an unbalanced tangential component results in a purely perpendicular force with all tangential components canceled ? [/QUOTE]
Insert quotes…
Post reply
Forums
Physics
Classical Physics
Mechanics
Centripetal Force and Pascal's Principle
Back
Top