Recent content by Timtam

If it occurs spontaneously then it must increase entropy but the possible micro states reduce so what else is occurring to increase entropy

Thanks ChesterMiller that makes sense , what are your thoughts on the second example- raising the liquid pressure, is that analogous to raising the temperature of the liquid ? I can't think of a real world example of where a liquid could be a higher pressure at the surface than the gas phase...

I am wondering about the impact of the hydro static pressure of a fluid on its boiling point. The simplest real world example scenario I can think of is the rate/onset of cavitation at a large depth vs a shallow depth. As we increase the submarine propellor speed to a speed where the adjacent...

I agree that Snells law doesn't apply at 0° But we are seeing a bending of the wave in the deep water are we not ? I don't think its refraction on that basis. but i wouldn't expect -if we shine a light at the normal at a glass box - to see any bending of wave outside or inside the glass but...

I managed to find a ripple tank photo that I believe replicates the 'wavefronts approaching an abrupt transverse depth change from the normal’ scenario we are discussing Here is the link and the blurb https://fphoto.photoshelter.com/image/I00005PtiOGFXRRU REFRACTING WAVES IN RIPPLE TANK Waves...

Yes this the point I feel @jbriggs444 made very well but the most common surfing examples of this happening Mavericks Nazare Jaws it’s actually abrupt depth changes across the wave ray (deep offshore channels or ridges) that cause the most significant Focussing ... where the 'intermediate'...

Uggh True True so not that simple Ive been reading a few surfing posts about this issue in the interim and it seems that there is a bit of debate amongst surfers whether this phenomenon is Refraction or Diffraction https://www.swellnet.com/forums/crystal-ball/331846 As a wave meets the...

I agree with this logic regarding the zero limit of the intermediate section presenting a wave a depth gradient at right angles to wave ray My only concern (aside from the many real world surfing examples) is that if there is a discontinuity along the wave ray, we would have a situation where...

Because every prior time I have deviated a thread from an OP to some other example it ends up off topic and not helping I'm not sure and don't want to get into it in this thread, regardless If that is the case then we can stick to surface waves as in the OP There is something seriously wrong...

Yup but Is light the best example ? I’m worried it might broaden the thread or get it off topic. What do you think is causing the convergence in this picture ? I’ve only ever read that it’s caused by refraction there has never been described as requiring an angle only a velocity differential.

I don’t understand this is the classical refraction example ? Are you saying because the wave Ray is perpendicular to the depth change/ shallow water that there will be no refraction ? How will the the two propagation speeds reconcile ?

When a wave encounters the shallow water of a headland the shallow section slows while the deeper section continues traveling at a faster speed. This causes refraction of the wave ray towards the shallower headland section For wave rays encountering perpendicular a shallow headland does...

The question was prompted by a CFD result i am trying to understand When a high pressure volume is separated from a lower pressure by an angle surface the isobars behave interestingly The Isobars suggest that the action reaction / thrust line is (Red line) but the velocity arrows suggests most...

Perhaps I could simplify it by asking it another way , in the thrust of a Bottle rocket (aka our high pressure volume ) fitted with a gimble, Does the gimble angle change the direction of the action force at the base , the reaction force in the nose or both 1. Change the direction of the...

I have a high pressure volume coupled with a low pressure volume by a pipe and valve . If the pipe was straight I would expect the isobars of the pressure gradient to be parallel to the pressure differences and perpendicular to the pipe , I would expect a reaction force (red arrow) on the wall...