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Test2 Review 303 Fall 2010

Test2 Review 303 Fall 2010 - RUTGERS BME 125:303 P Moghe...

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RUTGERS BME 125:303 BIOMEDICAL TRANSPORT PHENOMENA Problem Review II P. Moghe Fall 2010 1. Blood flows through a 0.5 cm diameter artery of 50 cm length. The viscosity of blood can be assumed to be 3 cP. The mean hydrodynamic pressure drop is 17 mm Hg. (a) What is the shear stress of blood at the artery wall in dyn/cm 2 ? (b) What is the shear rate of blood at the artery wall? (c) What is the volumetric flow rate of blood in cm 3 /s? 2. You are designing a hollow fiber unit. The flow-rate of blood is assumed to be at high enough a rate that blood behaves as a Newtonian fluid. The fiber diameter is 600 microns and their length is 30 cm. You want a flow-rate of 12 ml/min for each fiber. What should be the pressure drop in mm Hg across the fiber length to achieve this flow-rate? (760 mm Hg = 101,325 N/m2). Make appropriate assumptions as necessary. 3. Consider the design of a hollow fiber unit for an extracorporeal bioartificial liver. Blood flows through the lumen of each hollow fiber contained within the device at a flow rate of 400 ml/min.
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