Say I have a flexible tube of 1 mm ID and 1 meter length with only 1 entry/exit point. I.e. It's a closed end tube. Let's call end that is closed as A and end that is open as B. I completely fill it with water without any bubbles and attach B-end to syringe. Now when I draw out the water from this B-end the tube starts to collapse as its flexible. Similarly when I pump in water at B-end in this collapsed tube it will again expand.
My question is they when the tube starts to collapse, initially it collapses uniformly but as the ID becomes small and reaches micro dimensions, the A-end collapses more than B-end. My question is that Why does it start its collapse from the closed end that is A-end and why does it expand from near the open B-end ? The negative pressure at closed A-end is much more than the pressure at B-end while pulling water out but the pressure at B-end is more when pushing water in.
How do I explain this with microfluidics?
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