fluid mechanics Flashcards
what happens when a body moves through a fluid/a fluid flows over an object?
the fluid will exert pressure on the object which tends to alter the motion of the object
what is fluid mechanics?
the study of forces that act on bodies in fluids and the effects of these forces on the movement of the bodies
what determines the resistance a body experiences when moving though a fluid?
the fluid’s density
what is a drag force?
a retarding force exerted by the pressure of a fluid on an object moving through it
what effect does a drag force have?
generally decelerates the object
what are the 3 components of drag?
viscous drag, pressure drag, and wave drag
what is viscous drag?
the cumulative effect of friction between layers of a fluid
what does viscous drag depend on?
the viscosity of the fluid, the surface area of the object, the relative velocity of the object, and the volume of fluid surrounding the object
what is pressure drag caused by?
the pressure gradient created when an object is in motion
where does wave drag occur?
only at the boundary between two different fluids
what is lift force?
a force acting at right angles to the drag force (not always upward)
what causes lift force?
different speeds of fluid flowing over the opposite sides of an object
how can lift force be produced?
through asymmetric shape, asymmetric orientation, asymmetric surface texture, or spin
