The throttling process is a constant enthalpy process, in which the pressure decreases. So,

h1 = h2

u1+p1v1 = u2+p2v2

If the pressure is decreasing and if we consider the Joule-Thomson coefficient to be such that the temperature is decreasing too(so internal energy, u will decrease), then the specific volume will increase. If the specific volume increases won't it cause a change in velocity and so the kinetic energy? Why is it said that there is a negligible change in kinetic energy in a throttling process?



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