Question

5. A saline solution with a viscosity of 5 x 10 Ns/m2 and SG 1 is to be injected using a hypodermic needle with inside diameter d 0.2 mm; length L-2.5cm; and a plunger diameter D 1cm. Pushing on the plunger creates the AP needed for flow through the necdle duct. The exit pressure into the vein is 150 mmHg (watch units) and the maximum force that can be exerted on the plunger by a thumb is F 35 N. Assume laminar flow, use results from sec 6.9.3 to estimate the volume rate of F-, saline that can be produced; (b) compute Re to verify if the flow is laminar or not. pthD

Answer 1

Force on unge 3SN (a) Volume fou, τα te (a):? The force on plunge* İs given by 4. ressurediffeven 千 35 4 Now; we know the γelati、n ㄴ128从 o2X) a- 1.39ms (b) vevi Fication for Lminar flow> S Aini-, iniection ayeq 4

2 NOU Re- 178-24 Since vevifed as laminar tlow e < 20 0 o , this is