Fluids Mechanics - Determine algebraic formula for velocity

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SUMMARY

The discussion focuses on deriving an algebraic formula for the steady velocity (U) of a block sliding over an oil film with viscosity (μ) and thickness (h). The shear stress (τ) is defined as τ=μ du/dy, and the shear force (F) is calculated as F=τ*A, where A is the contact area of the block. Additionally, the discussion includes calculations related to a conveyor system's kinetic energy and motor torque capabilities, emphasizing the relationship between weight, speed, and torque in fluid mechanics applications.

PREREQUISITES
  • Understanding of fluid mechanics principles, specifically viscosity and shear stress.
  • Familiarity with algebraic manipulation and differential equations.
  • Knowledge of kinetic energy calculations in mechanical systems.
  • Basic concepts of motor torque and inertia in relation to conveyor systems.
NEXT STEPS
  • Study the derivation of the Navier-Stokes equations in fluid dynamics.
  • Learn about the impact of viscosity on fluid flow in different geometries.
  • Explore the principles of kinetic energy in mechanical systems and its applications.
  • Research motor torque calculations and their effects on conveyor speed and efficiency.
USEFUL FOR

Students and professionals in mechanical engineering, particularly those focusing on fluid mechanics, conveyor system design, and motor performance analysis.

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Homework Statement



A block of weight W is being pulled over a table by another weight Wo, as shown in the figure.
Find an algebraic formula for the steady velocity U of the block if it slides on an oil film of
thickness h and viscosity μ. The block bottom area A is in contact with the oil. Neglect the cord weight and the pulley friction.

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Homework Equations



the shear stress τ=μ du/dy
the shear force F=τ*A
 
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1) If conveyor moving with a linear speed of 2.5 feet per second has a total weight of 1750 lb, the conveyor holds approximately __________ lb.ft of kinetic energy.

2) A Motor has a conveyor as a load, which has a total inertia of 122 lb.ft*. if the motor has a maximum torque capability of 78 lb.ft, the motor can reach its full speed od 1725 rpm in approximately _________ seconds.
 

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