The medicine in a hypodermic needle should be transferred to the patient. The needle has an inside diameter of 0.3 mm and its length is 60 mm as shown below. The medicine has a viscosity of 0.980x10-3 Pa.s and its density is 800 kg/m³. Consider flow both in needle and cylinder. Neglect exit losses from the needle and losses at the juncture of the needle and cylinder. Calculate the force needed on the piston. Suppose the doctors said that they need new drug delivery system to decrease the force needed to push the drug (this is critical to decrease the pain of the patient ). What do you suggest as an alternative design? (Do not try to change the configuration (cylinder+needle) ). Cylinder Needle PI [ 5 mm Vs 18 mm/s dq=0.3 mm %3D 50 mm -60 mm
The medicine in a hypodermic needle should be transferred to the patient. The needle has an inside diameter of 0.3 mm and its length is 60 mm as shown below. The medicine has a viscosity of 0.980x10-3 Pa.s and its density is 800 kg/m³. Consider flow both in needle and cylinder. Neglect exit losses from the needle and losses at the juncture of the needle and cylinder. Calculate the force needed on the piston. Suppose the doctors said that they need new drug delivery system to decrease the force needed to push the drug (this is critical to decrease the pain of the patient ). What do you suggest as an alternative design? (Do not try to change the configuration (cylinder+needle) ). Cylinder Needle PI [ 5 mm Vs 18 mm/s dq=0.3 mm %3D 50 mm -60 mm
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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Transcribed Image Text:The medicine in a hypodermic needle should be transferred to the patient. The needle has an
inside diameter of 0.3 mm and its length is 60 mm as shown below. The medicine has a viscosity
of 0.980x10-3 Pa.s and its density is 800 kgʻm³. Consider flow both in needle and cylinder.
Neglect exit losses from the needle and losses at the juncture of the needle and cylinder.
Calculate the force needed on the piston. Suppose the doctors said that they need new drug
delivery system to decrease the force needed to push the drug (this is critical to decrease the
pain of the patient ). What do you suggest as an alternative design? (Do not try to change the
configuration (cylinder+needle) ).
,Cylinder
Needle
[ 5 mm
VE 18 mm/s
dq=0.3 mm
-50 mm
-60 mm
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