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The thin limb in the loop of Henle in rats has an inner diameter of 15 micron.
I have assumed for half a year that pressure must increase in the thin segment, forcing osmotic reabsorption of water.
But, the Bernouli effect says that pressure decreases as pipe diameter decreases.
Still, I think pressure must somehow increase. Because of my analysis for how tubero-glomerular feedback actually works, I assume macula densa senses osmolarity and increases GFR because the pressure is what concentrates filtrate, via osmotic reabsorption in the thin segment of the loop of Henle. So I thought:
The fourth phase of water at the surface of the thin limb, formed from glomerular filtration pressure (albeit decreased in the thin segment), the hydronium layer on it must repel from side to side of the tube. Causing same pump effect as when there is asymmetry of the fourth phase of water across a membrane. Increasing exosmotic pressure.
This also fits with that loop diuretics act by breaking down the fourth phase of water (stealing protons and destabilizing it. )