Applying a pressure drop across a capillary results in a volumetric flow rate ‘Q’ under laminar flow conditions. The flow rate for the same pressure drop, in a capillary of the same length but half the radius is____________________?
Correct answer: D
Explanation
Poiseuille's law shows flow rate Q is proportional to the fourth power of the radius (r^4). Halving the radius reduces Q by a factor of 2^4, which is 16.