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1324
bio website tudelft.nl
location Delft, Netherlands
age 27
visits member for 1 year, 5 months
seen 4 hours ago

Jul
16
revised Determine the number of days with North-East wind direction from the number of days with North and East wind direction?
updated title
Jul
16
suggested suggested edit on Determine the number of days with North-East wind direction from the number of days with North and East wind direction?
Jul
14
comment Will a drop of liquid flow from from the wide opening to the narrow opening of a thin funnel by the effect of air pressure?
Coincidentally, this week a paper came out in Langmuir that describes exactly this case, for both wetting and non-wetting droplets. Unfortunately it is behind a paywall, but for those with a university login: Luo et al. 2014, Langmuir, Behavior of a Liquid Drop between Two Nonparallel Plates
Jul
14
revised Will a drop of liquid flow from from the wide opening to the narrow opening of a thin funnel by the effect of air pressure?
Added recent article on the topic
Jul
10
comment Is a non-Newtonian gas possible?
@ChrisWhite That's a good point indeed, but since this was the first thing to pop up in a search I figured it would at least be helpful to mention it
Jul
10
answered Is a non-Newtonian gas possible?
Jul
2
revised Will a drop of liquid flow from from the wide opening to the narrow opening of a thin funnel by the effect of air pressure?
added 360 characters in body
Jul
2
comment Will a drop of liquid flow from from the wide opening to the narrow opening of a thin funnel by the effect of air pressure?
@Joce, I do agree that the contact angle matters in this case and that a contact angle <90 degrees (measured through the liquid) would result in the droplet moving to the right (towards B), but the droplet is drawn with the contact angle >90 degrees and that is what I wrote the answer for
Jul
2
comment Will a drop of liquid flow from from the wide opening to the narrow opening of a thin funnel by the effect of air pressure?
@Joce, indeed as Bernhard mentions: the radii should be positive when the center of the circle fitting the interface is inside the phase you are considering.
Jul
2
awarded  Curious
Jul
2
answered Will a drop of liquid flow from from the wide opening to the narrow opening of a thin funnel by the effect of air pressure?
Jun
26
comment Why is the majorana particle a fermion?
For completeness: Majorana fermions where recently observed (though indirectly) by the group of Leo Kouwenhoven in Delft
Jun
4
accepted What causes the 'tears' in yoghurt drinks?
Jun
4
comment water surface tension and buoyancy
The effect of the lower density of the detergent is negligible because you will only need a tiny amount $<1\%$ of detergent for the pin to sink. Check the wiki on surfactants if you want to known more
Jun
2
comment water surface tension and buoyancy
For the simple experiment: you could float a pin in a bowl of water and then add some dish washing soap to make it sink. The reason that it sinks is that the surfactant molecules of the soap will lower the air-water surface tension
Jun
2
comment water surface tension and buoyancy
Of course, assuming that the pin has a density higher then water. If it would have a density that is lower than that of water then the surface tension might still act, but the pin will not sink without it.
May
30
answered triangular symmetry of surface tension configuration of small grains on water
May
25
comment What makes laminar cascade break?
@Your PS: I think your drawings are terrific!
May
15
comment Why do the trees` trunk assumes a circular/curvy shape but not rectangle or square?
@Jim a tree growing equally to all sides would naturally lead to a hemi-spherical tree (taking the floor into account), not a cylindrical one. Up is preferred over sideways to catch sufficient light for photosynthesis. - But I agree that this is more biology than physics
May
9
revised Why doesn't rain fall down in streams (as opposed to drops)
added ST tag