Question 1 (1 point) If you start with laminar flow, which type of flow will you get when the fluid becomes too fast and the Reynolds number gets very high? pulsatile flow turbulent flow bolus flow Question 2 (1 point)
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Step 1: The question asks about the type of flow that results when laminar flow becomes too fast and the Reynolds number gets very high. Show more…
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(II) Poiseuille's equation does not hold if the flow velocity is high enough that turbulence sets in. The onset of turbulence occurs when the Reynolds number, Re, exceeds approximately 2000 . Re is defined as $$R e=\frac{2 \overline{v} r \rho}{\eta}.$$ where $\overline{v}$ is the average speed of the fluid, $\rho$ is its density, $\eta$ is its viscosity, and $r$ is the radius of the tube in which the fluid is flowing. $(a)$ Determine if blood flow through the aorta is laminar or turbulent when the average speed of blood in the aorta $(r=1.2 \mathrm{cm})$ during the resting part of the heart's cycle is about 40 $\mathrm{cm} / \mathrm{s}$ (b) During exercise, the blood-flow speed approximately doubles. Calculate the Reynolds number in this case, and determine if the flow is laminar or turbulent.
If Reynold's number is greater than 3000 , the flow of liquid is: (a) laminar (b) turbulent (c) regular (d) stab
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Mechanical Properties of Fluids
(II) Poiseuille's equation does not hold if the flow velocity is high enough that turbulence sets in. The onset of turbulence occurs when the Reynolds number, Re, exceeds approximately $2000 .$ Re is defined as $$R e=\frac{2 \overline{v} r \rho}{\eta}$$ where $\overline{v}$ is the average speed of the fluid, $\rho$ is its density, $\eta$ is its viscosity, and $r$ is the radius of the tube in which the fluid is flowing. (a) Determine if blood flow through the aorta is laminar or turbulent when the average speed of blood in the aorta $(r=0.80 \mathrm{cm})$ during the resting part of the heart's cycle is about 35 $\mathrm{cm} / \mathrm{s}$ . (b) During exercise, the blood-flow speed approximately doubles. Calculate the Reynolds number in this case, and determine if the flow is laminar or turbulent.
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