How to measure the drag force of a golf ball?
All the golf balls were tested in the wind tunnel in the laboratory where a drag-beam dynamometer was used to measure the drag force, F D, on each golf ball. The input frequency to the wind tunnel’s synchronous motor was varied from 20 Hz to 60 Hz. A pitot-static tube was used to determine the speed of the air flowing in the wind tunnel.
What is the drag coefficient of a deep dimple golf ball?
= 0.525 ± 0.025 for the range of Reynolds numbers tested. The deep dimple golf ball had an increase in drag coefficient across the Reynold number range tested but was consistent in the range of C D
What is the drag coefficient of a golf ball in wind tunnel?
The wind tunnel results for the commercial golf balls were consistent at higher Reynolds numbers, 8.0 × 10 4 and had a drag coefficient range of C D = 0.275 ± 0.0225 [ 4] . Larger variations occur at lower Reynolds numbers, <5.0 × 10 4, for the commercial golf balls.
What is the difference between drag coefficient and a a?
A = characteristic frontal area of the body (m2) The drag coefficient is a function of several parameters like shape of the body, Reynolds Number for the flow, Froude number, Mach Number and Roughness of the Surface. The characteristic frontal area - A - depends on the body.
Homework Statement
A golf ball and a basketball are both moving through the air at 10 m/s. Which has the higher drag coefficient?
The Attempt at a Solution
Since the basketball has a larger area that would make the denominator larger which makes the Cd smaller?
Answers and Replies
Since the basketball has a larger area that would make the denominator larger which makes the Cd smaller?
Why is golf ball aerodynamics not fully understood?
Prior studies have revealed that golf ball aerodynamics is still not fully understood due to the varied dimple size, shape, depth and pattern. The current study experimentally measured drag coefficients of a range of commercially available golf balls, under a range of wind speeds.
How many dimples are in a golf ball?
Most commercially manufactured golf balls have between 250 and 500 dimples, however these dimples vary in size, shape and depth. Golf ball manufacturers often claim superior aerodynamic ...
Is golf ball aerodynamics complex?
The aerodynamics of golf balls is considerably more complex than that of many other spherical balls. The surface roughness in the form of dimples intensifies the level of complexity and three-dimensionality of air flow around the golf ball. Prior studies have revealed that golf ball aerodynamics is still not fully understood due to ...
The drag coefficient quantifies the drag or resistance of an object in a fluid environment
Any object moving through a fluid experiences drag - the net force in the direction of flow due to pressure and shear stress forces on the surface of the object.
Example - Air Resistance Force acting on a Normal Car
The force required to overcome air resistance for a normal family car with drag coefficient 0.29 and frontal area 2 m2 in 90 km/h can be calculated as:
