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Lec. 13 notes
Lec. 13 notes

Aerodynamics Analysis of F-16 Aircraft
Aerodynamics Analysis of F-16 Aircraft

... When consider the normal shape of the graphs we could see same change in graph of Figure 9. The value at zero angle of attack is little bit stationary and it is because for lower angles of attack the flow will not separate much over the airfoil. But when the angle of attack increases the flow will s ...
SELF-EXCITED VIBRATION
SELF-EXCITED VIBRATION

Pendulum Periods
Pendulum Periods

... Air resistance is sometimes referred to as a drag force. Experiments have been done with a variety of objects falling in air. These sometimes show that the drag force is proportional to the velocity and sometimes that the drag force is proportional to the square of the velocity. In either case, the ...
A generalized reciprocal theorem for predicting the force
A generalized reciprocal theorem for predicting the force

Buoyancy and fluid flow
Buoyancy and fluid flow

Lab 7: Fluids - Physics Department, Princeton University
Lab 7: Fluids - Physics Department, Princeton University

... It is a remarkable fact that fluid immediately adjacent to an immobile surface, such as the wall of a pipe, always has zero velocity. In order for fluid some distance y from the surface to flow at velocity v, a force must be applied: ...
Fluid Mechanics II
Fluid Mechanics II

Basic Glider Aerodynamics
Basic Glider Aerodynamics

Viscosity: The Fluids Lab
Viscosity: The Fluids Lab

... ρfluid = density of water was given above g = convert 9.8 m/s2 to cm/s2 = 980cm/s2. V = velocity of sphere in the water (cm/s) d = measured diameter of sphere (cm) m = whatever the clay packaging says or has been weighed on the scale – be sure to convert to kg Finally Solve for µ! ...
Testing
Testing

Using mathematics to model the flight of a rocket
Using mathematics to model the flight of a rocket

Forces on a Model Rocket
Forces on a Model Rocket

Transport Phenomena
Transport Phenomena

Blade Element Theory for Rotor in Hover and Climb
Blade Element Theory for Rotor in Hover and Climb

... Blade element theory is similar to the strip theory in fixed wing aerodynamics. The blade is assumed to be made of several infinitesimal strips of width ‘dr’ . The lift and drag are estimated at the strip using 2-D airfoil characteristics of the airfoil at that strip, and what we know about the loca ...
Bend it Like Magnus: An Inspection of the Magnus Effect in Soccer
Bend it Like Magnus: An Inspection of the Magnus Effect in Soccer

Size of drag force on bacteria?
Size of drag force on bacteria?

... Imagine you are writing it for one of your classmates-an intelligent reader who knows some science but ...
S1560i2 - dexsummerresearch
S1560i2 - dexsummerresearch

Comment_on
Comment_on

... The lift force is thus forced to be proportional to V and not to V2 as assumed by R&R. This proportionality can also be derived using Bernoulli`s equation for a flow like that pictured in figure 1 in the paper by R&R. The flow in a not rotating frame of reference following the sphere is assumed to b ...
AE 2020: Low Speed Aerodynamics
AE 2020: Low Speed Aerodynamics

Lecture Presentation Chp-10
Lecture Presentation Chp-10

... where, A is the duct crosssectional area and is the fluid mass flow rate (e.g., kg/s). For an incompressible fluid, the density is constant. ...
Effect of Weight on Drag and Airplane Performance
Effect of Weight on Drag and Airplane Performance

... causes drag which can affect performance in all flight regimes. The type of drag resulting from weight is called induced drag. Unlike normal drag that intuitively is a resistive force due to the friction of the air moving over the airframe surfaces, induced drag is produced in the act of generating ...
Introduction to Fluid Mechanics - Pharos University in Alexandria
Introduction to Fluid Mechanics - Pharos University in Alexandria

... • Helps in understanding physics • Useful in data analysis and modeling • Enables scaling of different physical dimensions and fluid properties ...
FE4
FE4

... The laws governing the motion of an object, as given in the previous chapters, apply only when all the forces acting on the object are taken into account. In the real world all objects move through fluids so we must include the forces exerted by the extremely large number of fluid molecules. In some ...
Question paper
Question paper

... 14 One method used to find the viscosity of a liquid is to measure the terminal velocity of a solid spherical object falling through it. In such an experiment the following data are provided: weight of sphere = 4.8 × 10–3 N radius of sphere = 2.5 × 10–3 m volume of sphere = 6.5 × 10–8 m3 density of ...
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Drag (physics)



In fluid dynamics, drag (sometimes called air resistance, a type of friction, or fluid resistance, another type of friction or fluid friction) refers to forces acting opposite to the relative motion of any object moving with respect to a surrounding fluid. This can exist between two fluid layers (or surfaces) or a fluid and a solid surface. Unlike other resistive forces, such as dry friction, which are nearly independent of velocity, drag forces depend on velocity.Drag force is proportional to the velocity for a laminar flow and the squared velocity for a turbulent flow. Even though the ultimate cause of a drag is viscous friction, the turbulent drag is independent of viscosity.Drag forces always decrease fluid velocity relative to the solid object in the fluid's path.
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