Consider blood $($ $=3\mathrm{.}3$ mPas$)$ flow in human capillary veins $($diameter $8$ m$,$ length $1$ mm$,$ pressure drop

$$p$=10$ kPa$).$

$1)$ What is the volume flow rate and how long does it take for the blood entering the capillary to

flow through it$?$

$2)$ How high should the flow velocity be for the flow to be turbulent?

Consider now a microchannel characterized by the same length. The channel should have a minimum

flow rate of $5$ nl$/$min with $$p $=10$ kPa. What is the minimum channel diameter and how long does it take

for a flow to go through the channel?