Chemical Engineering - Chemical Engineering Thermodynamics - Discussion

A device designed to control the direction or characteristics of fluid flow (especially to increase velocity) as it exits (or enters) an enclosed chamber or pipe. In a nozzle, the fluid's velocity increases as it passes through the converging section, which decreases its pressure according to Bernoulli's principle.

Pressure is not increased because when going to a converging section, it only creates back pressure which means it's a negative pressure that decreases the pressure and it also increases obviously the velocity for this.

Usually, a nozzle is a converging duct so along with the flow, the area decreases so, by continuity we can say velocity increases when velocity increases (kinetic energy increases) we can say pressure decreases by the Bernoulli equation.

I think D is correct. At nozzle velocity, increase or will decrease. So, both KE and pressure increase.

I think it is B. reduces kinetic energy and increases pressure.

I think C is correct because in Nozzle Area decreases Pressure Increases. Both kinetic energy and pressure increases.