Physical Concepts and Basic
The rate of change
flow velocity is the acceleration. Faster rate of
change in velocity gives rise to a greater acceleration in flow.
acceleration can be either positive, i.e. when the velocity is increasing or
negative, i.e. when the velocity is reducing.
This can be appreciated from the flow velocity recording of aortic
velocity and its derivative. Fig.
shows the aortic flow and the flow
Aortic flow and its first derivative, the flow acceleration (dQ/dt). Aortic
pressure and rate
its pressure change (dP/dt) is
Thus acceleration is the rate
change of velocity. We have for the
accelerations associated with the longitudinal, radial and rotational