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Himal kharel
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I recently noticed that when a cup of tea was stirred, the floating leaves collect at center of cup rather than outer rim. Can anyone explain this?
The cleaners designed to remove light-density materials are often referred to generically as "reverse cleaners" since the light material at the center of the vortex is rejected and heavier materials from the outside of the vortex are accepted into the clean pulp stream.Bill_K said:I don't see the similarity. The discussion on centrifugal cleaners is about the settling rate of suspended particles, not the congregation of floating ones.
The leaf is less dense than the liquid tea. That's why it is floating.lluke9 said:Is that what this "hydroclone" thing is based on? The leaf is more dense, so the tea doesn't "push" much on the leaf?
The phenomenon described by the OP works best, when the leaves have already sunk to the bottom. The secondary flow takes them from the bottom into the center. Contrary to what you claim, It is NOT a centrifugal separation effect. Look at the links I posted.turbo said:The leaf is less dense than the liquid tea. That's why it is floating.
[URL]http://upload.wikimedia.org/wikipedia/commons/7/77/Tea_leaf_Paradox_Illustration.svg[/URL]A.T. said:
Some of the surface leaves go to the rim. But others are sticking together due to surface tension. They form a compound with internal forces (just like the foam) which prevents individual leaves form moving outwards.xts said:Einstein's explanation for the bottom leaves grouping implies that surface ones should be taken to the rim. But they group also! So there must be another mechanism, stronger than Einstein's circulation.
That is a plausible explanation.A.T. said:They form a compound with internal forces (just like the foam) which prevents individual leaves form moving outwards.
Some potential reasons:xts said:One question remains (and, honestly, I am not sure if I know how to make appropriate calculations...) - why the 'floating isle' of straws or foam stays in the centre rather than drift towards the rim with Einstein's stream? At the first guess position in the centre should be unstable due to Einstein's circulation.
The first argument is false. Considering Einstein's circulation the centre is an unstable equilibrium point - infinitesimal shift from it increases drift force in the same direction.A.T. said:Some potential reasons...
xts said:[URL]http://upload.wikimedia.org/wikipedia/commons/7/77/Tea_leaf_Paradox_Illustration.svg[/URL]
That is an explanation why sunken leaves collect in the centre of bottom.
Density of the objects matter only to that if they float on the surface or sink.Himal kharel said:What if we put objects same density as water instead of tea leaves?
I am just a high school student. Can you explain this in simple language?
Yeah. that seems reasonable. Maybe not the air friction, but rather some leaves/foam sticking to the rim with their VanDerWaals' forces, thus forming additional friction at the surface layer. So we would have then circulation: rim->centre at bottom, rim->centre (but slower) at the surface, centre->rim in the mid depth.DrStupid said:Due to surface tension and interaction with air the rotation is also decelerated at the surface. This should result in an additional vortex in opposite direction.
The purpose of stirring tea with floating leaves is to evenly distribute the flavor and aroma of the tea leaves throughout the entire cup of tea. This helps to enhance the overall taste and experience of drinking tea.
The recommended time for stirring tea with floating leaves is 2-3 minutes. This allows enough time for the leaves to release their flavor and for it to be evenly distributed throughout the tea.
It is recommended to use a wooden or bamboo utensil to stir the tea with floating leaves. This is because metal utensils can alter the taste of the tea and affect the brewing process.
Yes, you can reuse the floating leaves for another cup of tea. However, it is recommended to use them within the same day as the flavor may become weaker over time.
If you don't stir the tea with floating leaves, the flavor and aroma of the tea may not be evenly distributed. This can result in a weaker or unbalanced taste in the tea.