Question

An intravenous drip bag has a volume of, 500 cm3 (0.5 ml). Assume it empties through a 20-gauge needle (diameter of about 0.6mm) with a length of 2 inches (5.08 cm) and we want it to empty in 30 minutes. How high must the bag be hung? Assume the viscosity of the fluid is 0.005 Pa s, the density of water is 1000 kg m-3, and the pressure in the vein is 20 mm-Hg (or 2666 Pa gauge pressure).

Answer 1

Compare equation (2) and (l) h(9.8)(1000 )-2666 8(0.005)(0.0508 )' 0.0005 80.005) (0.0508)x 3.14 (0.0003) h(9.8) (1000)-266630_ hx7134-13.33x 105 13.33x105 7134 0.00187x10 = 187 m Therefore the height of the bag is, 187 m