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In a throttling process, which of the following parameters remains constant?

In a throttling process, which of the following parameters remains constant? Correct Answer Enthalpy

Explanation:

If steam is throttled, its enthalpy remains constant and pressure drop takes place.

Throttling (Isenthalpic) process:

  • A throttling process occurs when a fluid flowing through a passage suddenly encounters a restriction in the passage.
  • The restriction could be due to the presence of an almost completely closed valve or due to sudden and large reduction in flow area etc.
  • The result of this restriction is a sudden drop in the pressure of the fluid as it is forced to flow through the restriction. This is a highly irreversible process and is used to reduce the pressure and temperature of the refrigerant in a refrigeration system.
  • Since generally, throttling occurs in a small area, it may be considered as an adiabatic process (as the area available for heat transfer is negligibly small) (δQ = 0) also since no external work is done (W = 0).

∴ h1 = h2

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