What is a relation between relaxation time and mean free path for ideal gas?

These two values should be interconnected throufg integral of collisions. But I can not find a clear formula.

10 November 2018 233 1 View

What do You think about the articles which quotation index on RG is high and reading index is low?

Is h-index really important when compared with the number of downloads for the researcher? How to tell fair h-index from the artifical one made through personal contacts&links and social...

04 May 2018 3,179 1 View

Any example of a quantum particle in unstable state and driven by harmonic force?

May be anyone may bring an example of such kind particle taking place in nuclear physics or solid state or smth else. For example an electron in disordered semiconducter situated at maximum point...

04 May 2016 6,060 6 View

Klein- Gordon equation for the spinless particle in potential field, how does it look?

I didn't find in literature K-G eq. for non-free particle. Anybody who knows please write me down it. Thanks in advance Viktor

01 February 2016 1,935 5 View

May exist the force upon point mass directed along its velocity?

The opposite directed one is e.g. the drag force. T here should be a fundamental reason for this non-existing. What is?

04 May 2015 227 0 View

Can anybody present an example of ODE with a periodical solution and having bifurcation with the period changing by integer or half-integer times?

11 December 2014 6,146 2 View

Mechanical effort depending on acceleration - any thoughts?

In Newtons II law the force F acting on a body may depend on time, position and velocity but not acceleration. Otherwise the parallelogram principle doesn't operate for partial accelerations. And...

07 August 2014 9,527 9 View

Why are the velocities so high in my Boussinesq approximation Fluent simulation?

Hello, I have a mechanism where air rises due to convective flows. In this simulation, nothing is driving the air except this. I understand that the Boussinesq approximation only works for small...

02 March 2021 4,910 3 View

What is the characteristic length to determine the Reynolds number for the scattered turbulent fluid flow?

Dear all, I just saw this example in FB on the difference between laminar flow and turbulent flow. The flow from a pipe hits the sink and scattered. The flow from the pipe is characterized as...

02 March 2021 1,999 5 View

Is there a deep reason for using the squared modulus of the wave function as the probability density of the existence of the particle?

I think we were all surprised at the first time we got to know quantum mechanics that the squared modulus of the wave function is the probability density of the existence of the particle? The role...

28 February 2021 6,282 9 View

How do you mesh a thin solid in Fluent?

Hello, I have used the shell function on SpaceClaim to create thin solids for the model I am studying. These are contained within an enclosure for my study. I chose this approach as it avoids the...

24 February 2021 8,856 3 View

No streamlines present in a small region inside a flow. This means exactly what?

No streamlines present means whether the flow is getting obstructed there and the velocity inside the region is zero? Or else, the fluid is trapped inside that region with a nonzero velocity?...

22 February 2021 5,249 10 View

The most suitable method to calculate the stress intensity factor in the presence of contact between the crack lips?

I'm trying to study cracked structures under a compressive load taking into account contact between the crack lips. I would like to know if the method of extrapolation by displacement remains...

21 February 2021 8,694 4 View

Can anyone help with an Accurate Diffuser Expansion Loss formula for rectangular shaped diffusers in turbulent flow regime?

I have tried Idelchik's Handbook of Hydraulic Resistance 4th Edition (2007 page 300) formulas and across some range the formulas are reported valid for, the law of conservation of energy is...

20 February 2021 2,504 1 View

How to visualize stress in a coating defined by "Skin" in Abaqus?

Hello All! I'm trying to model a contact between a coated substrate and a tip in Abaqus. The coating is ultra-thin compared to the geometry of the substrate. So I defined the coating using the...

16 February 2021 1,594 3 View

How can I find the thermophysical properties of high temperature microencapsulated phase change materials (MPCM)?

Hi everyone. I am looking for a high temperature MPCM. More specifically, I need the thermo physical properties of a microencapsulated phase change material with the melting temperature between...

14 February 2021 3,606 2 View

How complex systems physics/statistical mechanics would be helpful for particle physics & Networking?

Recently, I've been selected for an ICTP program named Physics of Complex Systems. But, I have a keen interest in Particle Physics & Quantum networks. As statistical mechanics involved in...

11 February 2021 699 3 View