3) The drawing shows a blood transfusion procedure. 800 g of blood (pblood = 1060 kg/m3) in a
sealed (closed) bag, is fed into the patient via a needle with a 0.5 mm entrance diameter and 0.3
mm exit diameter. Assume the venous gauge pressure (pressure at tip of needle) is 1900 Pa, and
the bag should be completely empty in 1 hour. Calculate:
(1) The volume flow rate L -r
j k m
(2) Speed of the blood at needle entrance (vZ) and exit (v 1) 9
(3) Assuming the blood is static between the bag and needle, use Bernoulli’s equation to calculate
the height of the bag (h).