L4.20 pts 1. A normal physiological function is blinking, where the e.docx - L4.20 pts 1 A normal physiological function is blinking where the eyelid

# L4.20 pts 1. A normal physiological function is blinking, where the e.docx

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L4.20 pts 1. A normal physiological function is blinking, where the eyelid spreads a tear film over the cornea of the eye (Diagram to the right). The average blink velocity, V= 180 mm sl, and the average thickness of the tear film, h= 1 mm. The flow of the tear fluid induced by the motion of the eyelid exerts a shear stress on the surface of the cornea. Using control volume analysis, model the flow of the tear fluid as the flow of fluid between two parallel solid plates induced by the motion of the top plate at a constant velocity, V. The top plate will represent the eyelid and the bottom plate will represent the surface of the cornea. You can ignore the curvature of the eye, there is no pressure drop driving the flow of the fluid, and treat the tear fluid as a Newtonian liquid. The flow is fully developed and one-dimensional. a) Draw a diagram of your control volume, choose a coordinate system, label all boundaries, and label all stresses acting on the control volume. (2 pts) b) Derive the mass balance for your control volume. What does the mass balance say about
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