A patient is to be given a blood transfusion. The blood is to flow from a raise

Question

A patient is to be given a blood
transfusion. The blood is to flow from a raise
bottle, through a tube, to a needle inserted in the
vein, as shown in the figure to the right. The
inside diameter of the 25-mm-long needle is
0.8mm, and the required flow rate is 2.0cm3 of
blood per minute. How high h should the bottle
be raised above the needle? Obtain the density
? and viscosity ? of blood from the tables in
Giancoli, and assume blood pressure is 78 torr
above atmospheric pressure.

A patient is to be given a blood transfusion. The blood is to flow from a raise bottle, through a tube, to a needle inserted in the vein, as shown in the figure to the right. The inside diameter of the 25-mm-long needle is 0.8mm, and the required flow rate is 2.0cm3 of blood per minute. How high h should the bottle be raised above the needle? Obtain the density ? and viscosity ? of blood from the tables in Giancoli, and assume blood pressure is 78 torr above atmospheric pressure.

Explanation / Answer

Apply the Poiseuille equation:

Q = ?(R^4)delp/8

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