Q6/ Air at a density of 0.9 kg/m³ enters the intake (control face 1) of a car engine with a diameter of 0.2m at an absolute velocity of 50 km/hr (relative to the earth), as illustrated in Figure. The exhaust at a density of 0.5 kg/m3 leaves the tail of the car engine (control face 2) with a diameter of 0.1 m. The car (engine) (control volume) is traveling at an absolute velocity of 30 km/hr (relative to the earth). (a) Determine the velocity of the flow at control face 1 relative to the control volume, v1. (b) Determine the mass flow rate through the car engine. (c) Determine the absolute velocity of the flow at control face 2, v2 (abs). (d) Determine the velocity of the flow at control face 2 relative to the control volume, v2. " S0 km/he as kgm D alm D,-02 m Control volume Intake Exhaust 30 km/hr
Viscosity
The measure of the resistance of a fluid to flow is known as viscosity. Most fluids have some resistance to motion, the resistance provided by the fluid is called viscosity. This resistance is created by the force of attraction between the fluid molecules. If you pour water through a funnel, it flows easily and quickly, because it has very little resistance. But if you pour honey through a funnel, it may take a little time longer, as the density of honey is high.
Poiseuille's Law
The law of Poiseuille or Poiseuille's equation states that the pressure drop of an incompressible fluid especially a liquid in a laminar flow that passes through a cylindrical tube of length L, radius r, pressure gradient ΔP, and mainly depends on the viscosity of the fluid is nothing but the pressure difference of the layers of fluids. ΔP=P1-P2
Drag Forces
Forces that occur due to the movement of fluid are known as fluid mechanics. Following are the fluids present:
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