In a horizontal Venturi tube carrying an ideal fluid
PHYSICS · Single correct · CBSE · Physics · Mechanical Properties of Fluids · Mechanical Properties of Fluids
Problem
In a horizontal Venturi tube carrying an ideal fluid, a manometer shows that the static pressure at the throat is lower than at the wider inlet. Which statement correctly accounts for this observation?
(a) Kinetic energy per unit volume decreases in the throat; therefore the static pressure there must increase to keep the total energy unchanged.
(b) Because the pipe is horizontal, gravitational potential energy is zero everywhere, so static pressure should remain the same; any difference shown by the manometer is due to experimental error.
(c) The increase in kinetic energy per unit volume that accompanies the higher speed in the throat is compensated by a fall in static pressure, so the total mechanical energy per unit volume stays constant.
(d) Energy is lost to viscosity even in an ideal fluid, so total mechanical energy is not conserved between inlet and throat.