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Which of the following statements are correct for a throttling process? 1. It is an adiabatic steady flow process 2. The enthalpy before and after throttling is same 3. In the processes, due to fall in pressure, the fluid velocity at outlet is always more than inlet velocity (a) 1 and 2 only (b) 1 and 3 only (c) 2 and 3 only (d) 1, 2 and 3 |
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Answer» (a) 1 and 2 only Throttling process involves the passage of a higher pressure fluid through a narrow constriction. This process is adiabatic, and there is no work interaction. Hence, Q = 0 & W = 0 \(\Delta\)PE = 0 (Inlet and outlet are at the same level) \(\Delta\)KE = 0 (KE does not change significantly) \(\therefore\) Applying the SFEE, h1 = h2 Thus, enthalpy remain constant Further, the velocity of flow is kept low and any difference between the kinetic energy upstream and downstream is negligible. The effect of the decrease in pressure is an increase in volume. |
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