La Patrulla Fronteriza de los Estados Unidos analiza la compra de un helicóptero nuevo para la vigilancia aérea de la frontera d
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Answer:
The flow velocity at outlet is approximately 37.823 meters per second.
The inlet radius of the nozzle is approximately 0.258 meters.
Explanation:
A conical nozzle is a steady state device used to increase the velocity of a fluid at the expense of pressure. By First Law of Thermodynamics, we have the energy balance of the nozzle:
Energy Balance
(1)
Where:
- Mass flow, in kilograms per second.
,
- Specific enthalpies at inlet and outlet, in kilojoules per second.
- Flow speed at inlet and outlet, in meters per second.
It is recommended to use water in the form of superheated steam to avoid the appearing of corrosion issues on the nozzle. From Property Charts of water we find the missing specific enthalpies:
Inlet (Superheated steam)
Where is the specific volume of water at inlet, in cubic meters per kilogram.
Outlet (Superheated steam)
If we know that ,
,
and
, then the flow speed at outlet is:
(2)
The flow velocity at outlet is approximately 37.823 meters per second.
The mass flow is related to the inlet radius (), in meters, by this expression:
(3)
If we know that ,
and
, then the inlet radius is:
The inlet radius of the nozzle is approximately 0.258 meters.