Calculate Drag Force for a 14.7mm Sphere in Oil with Given Parameters

In summary, drag force is a force that opposes the motion of an object through a fluid medium. It is calculated using a formula that takes into account the properties of both the object and the fluid. The factors that affect drag force include speed, fluid properties, object shape and size, and surface roughness. Drag force is important in various real-world applications and can be reduced by using streamlined shapes, smoothing surfaces, controlling movement, and using lubricants or coatings.
  • #1
Tommybc
2
0
A sphere, 14.7 mm in diameter, drops at a rate of 0.08 m/s in oil
µ = 0.1 Ns/m^2 , σ = 0.85 ). Calculate the drag force acting on the sphere.

[Answer: 1.85e-3 N]


F_d=0.5*rho*C_d*A*u^2, Re=u*p*L/μ

I attempted to find the Re, but am struggling on finding the coefficient of drag now. Once I crack this I will be able to progress please help!
 
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  • #2

FAQ: Calculate Drag Force for a 14.7mm Sphere in Oil with Given Parameters

What is drag force?

Drag force is a force that acts opposite to the direction of motion of an object through a fluid medium, such as air or water. It is caused by the friction between the object and the fluid, and it slows down the object's movement.

How is drag force calculated?

Drag force is calculated using the formula Fd = 0.5 * ρ * v^2 * Cd * A, where ρ is the density of the fluid, v is the velocity of the object, Cd is the drag coefficient, and A is the cross-sectional area of the object. This formula takes into account the properties of both the object and the fluid it is moving through.

What factors affect drag force?

The factors that affect drag force include the speed of the object, the density and viscosity of the fluid, the shape and size of the object, and the roughness of its surface. Additionally, the angle of the object's movement and the presence of obstacles in the fluid can also affect drag force.

Why is drag force important?

Drag force is important because it plays a crucial role in many real-world applications, such as aerodynamics, fluid dynamics, and automotive and aircraft design. Understanding and accurately calculating drag force can help engineers and scientists optimize the performance and efficiency of various objects and systems.

How can drag force be reduced?

There are several ways to reduce drag force, such as using streamlined and aerodynamic shapes, smoothing out the surface of the object, and decreasing its size. Additionally, controlling the speed and angle of the object's movement can also help reduce drag force. In some cases, adding a lubricant or a special coating to the object's surface can also decrease drag force.

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