Stokes' law - Wikipedia
In fluid dynamics, Stokes' law gives the frictional force – also called drag force – exerted on spherical objects moving at very small Reynolds numbers in a viscous fluid. [1] It was derived by George Gabriel Stokes in 1851 by solving the Stokes flow limit for small Reynolds numbers of the Navier–Stokes equations .
8.6: Drag Forces in Fluids - Physics LibreTexts
2022年7月20日 · For very low speeds, the drag force depends linearly on the speed and is also proportional to the viscosity η of the fluid. For the special case of a sphere of radius R , the drag force law can be exactly deduced from the principles of fluid mechanics and is given by. F→ drag = −6πηRv→ ( sphere ) F → d r a g = − 6 π η R v → ( sphere )
Viscous Drag | Edexcel A Level Physics Revision Notes 2017 - Save …
2023年12月28日 · Determine the viscous drag acting on the ball bearing. Step 1: List the known quantities in SI units. Step 2: Sketch a free-body diagram to resolve the forces at constant speed. Ws = Fd + U. Step 3: Calculate the value for viscous drag, Fd. Fd = 6π ηrv = 6 × π × 0.3 × 5.0 × 10 -3 × 0.03 = 0.008482.
Drag force arises when an object moves through a fluid or, equivalently, when fluid flows past an object. In general, the drag force grows larger with increased flow velocity, but viscosity is a complex phenomenon that cannot be reduced to the simple relationship “drag force is …
Viscous Drag | Definition, Force & Examples | Study.com
2023年11月21日 · What is viscous drag formula? The viscous drag formula is given by Newton's law of viscosity, t= nA (dv/dx). In Newton's law of viscosity, t stands for viscous drag, n is viscosity,...
When a solid object moves through a fluid it will experience a resistive force, called the drag force, opposing its motion. The fluid may be a liquid or a gas. This force is a very complicated force that depends on both the properties of the object and the properties of the fluid.
In a remarkable 1851 scientific paper, G. Stokes first derived the basic formula for the drag of a sphere( of radius r=a moving with speed Uo through a viscous fluid of density ρ and viscosity coefficient μ . The formula reads- very small diameter when the …
Viscosity and Stoke’s Equation - UCSC
The drag force is given below: This is called Stoke’s law. Where η is the viscosity of the fluid, r is the radius of the ball and is the terminal velocity of the ball in that particular fluid. Plugging everything into the equation we can then find our expression for Stokes law.
Stokes' Law - University of Virginia
It was done in the 1840’s by Sir George Gabriel Stokes. He found what has become known as Stokes’ Law: the drag force F on a sphere of radius a moving through a fluid of viscosity η at speed v is given by: F = 6πaηv. Note that this drag force is directly proportional to the radius.
Viscous drag - Modern Physics Insights: Discover, Understand, …
2024年5月26日 · Viscous drag is a fundamental concept in fluid mechanics, crucial for understanding how fluids interact with solid objects. This force is exerted by a fluid on a body moving through it or when a fluid moves past a stationary body. It plays a vital role in various fields, from engineering to natural sciences.