# Steam flow through a nozzle is considered as _______.

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ISRO SDSC Technical Assistant Mechanical held on 12/02/2017
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1. Constant flow
2. Isothermal flow
4. Constant volume flow

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ST 1: Engineering Materials (Crystal Geometry)
350
16 Questions 8 Marks 20 Mins

## Detailed Solution

Explanation:

An adiabatic flow is a condition where the overall heat transfer interaction across the boundary of the system and surrounding is zero.

• If the system boundary is perfectly insulated with the surrounding then the heat interaction will be zero.
• nozzle is a steady-state steady flow device to create a high-velocity fluid stream at the expense of its pressure.
• The nozzle is perfectly insulated so the flow is adiabatic and also there is no moving part so shaft work is also zero.

From the steady flow energy equation,

$${h_1} + \frac{{C_1^2}}{2} + {z_1}g + \frac{{\partial Q}}{{dm}} = {h_2} + \frac{{C_2^2}}{2} + {z_2}g + \frac{{\partial W}}{{dm}}$$

As the change in potential energy is also zero hence SFEE is given by,

$${h_1} + \frac{{C_1^2}}{2} = {h_2} + \frac{{C_2^2}}{2}$$
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