Isenthalpic boiling

Repeat the Isenthalpic Boiling calculation in the text using the Steam Table data and the equation on p. 4 in Henley et al. (1984), and verily that you get the same result. 

A similar condition exists when the pressure on a saturated liquid at its boiling point is suddenly released (as from a ruptured line). The quantity of liquid that can be quickly converted to vapor (i.e., flashed ) in this way is obtained readily by considering an isenthalpic expansion. Figure 11 gives a temperature-entropy diagram that includes two isobars (P2 > Pi) and an isenthalp If saturated liquid at... 

In flash distillation, a liquid mixture at its boiling temperature (under pressure) is released into a vapor-liquid separator or a rectification column. No heat is added or removed (isenthalpic throttling, see Fig. 2-13). 

If a boiling solution of mass flux, L, is partially expanded in a constriction by experiencing a differential pressure drop dp, the solution is cooled by AT and expansion vapor of flow rate AD is generated (expansion evaporation under isenthalpic throttling at boiling conditions). A heat balance over the constriction with steam separator gives... 

A standard equation for prediction of the fraction of the liquid that flashes can be derived by assuming that the sensible heat contained within the superheated liquid due to its temperature above its normal boiling point is used to vaporize a fraction of the liquid. This isenthalpic analysis leads to the following equation for the flash fraction (Growl and Louvar, 1990),... 

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