Textbook ExpertVerified Tutor
27 Dec 2021
Given information
Blood pressure = above atmospheric pressure
Length of the needle = l
Radius of the needle =
Step-by-step explanation
Step 1.
As it exits the needle, the fluid pressure must be 78 torr higher than air pressure in order for the blood to enter the vein. Due to the viscosity of the blood, the pressure at the needle's entrance must be more than 78 torr. The blood reservoir is elevated above the needle to create that extra pressure.
By using Poiseuille’s equation to calculate the pressure
Where,
is pressure difference between the two ends
is the length of the pipe
is the dynamic viscosity
is the volumetric flow rate
is the radius of pipe
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