A patient is to be given a blood transfusion. The blood is to flow through a tub

Question

A patient is to be given a blood transfusion. The blood is to flow through a tube from a raised bottle to a needle inserted in the vein (Figure 1) . The inside diameter of the 4.1cm  long needle is 0.46mm , and the required  flow rate is 3.6cm3  of blood per minute.

A patient is to be given a blood transfusion. The blood is to flow through a tube from a raised bottle to a needle inserted in the vein (Figure 1) . The inside diameter of the 4.1cm long needle is 0.46mm , and the required flow rate is 3.6cm3 of blood per minute. How high h should the bottle be placed above the needle? Use ?blood=1.05 times 103kg/m3, ?blood=4.0 times 10?3Pa?s. Assume the blood pressure is 18 torr above atmospheric pressure. Express your answer using two significant figures.

Explanation / Answer

A patient is to be given a blood transfusion. The blood is to flow through a tube from a raised bottle to a needle inserted in the vein. The inside diameter of the 4.10 cm long needle is 0.380 mm and the required flow rate is 3.96 cm3 of blood per minute. How high should the bottle be placed above the needle? Obtain ? and ? from the Tables in the book. Assume the blood pressure is 17.7 torr above atmospheric pressure.

Apply the Poiseuille equation:

Q = ?(R^4)?p/8

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