What the heck is a throttling expansion process?
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The book states that under adiabatic conditions, a expansion process in which the pressure of a fluid remains constant throughout its initial and final states is called a throttling expansion process. An analysis is requested on how the constant enthalpy for this process is derived.
The fluid satisfies: Qp – Ws = ΔT H + ΔT U²/2 + ΔT g*Z = ΔT H, with Ws = 0 and Qp = 0; therefore, ΔT H = 0.
Derived from the first law of thermodynamics. The process is fast, with no work done, heat transfer occurs, and macroscopic kinetic and potential energies are ignored. Just evaluate the enthalpy.
The process of expanding while maintaining a pressure difference under adiabatic conditions is the throttling expansion process. The proof of constant enthalpy can be found in physical chemistry textbooks.
I don’t understand either; let’s see how everyone explains it
According to the basic principles of physical chemistry, when there is no exchange of energy or work between a system and its surroundings, the enthalpy of the system certainly remains unchanged.