Modelling the boiling delay upon venting vapour from a saturated liquid—vapour system

✍ Scribed by D. S. Lubbe; Gerrit Kornelius

• Publisher: John Wiley and Sons
• Year: 1998
• Tongue: English
• Weight: 692 KB
• Volume: 76
• Category: Article
• ISSN: 0008-4034
• DOI: 10.1002/cjce.5450760513

✦ Synopsis

A mechanistic model was developed to describe the pressure history when vessels, containing initially saturated liquid, are subjected to sudden depressurisation. A governing equation based on a volume balance was set up. The terms in this equation governing the number of bubbles and the growth rate both before and after departure from the boiling surface are dcrived. Constants describing the boiling surface are required and derived from experimental work. The model rewlts are compared to experiments at low (< 400 kPa) initial pressures, and reasonable agreement is obtained. The model results obtained for other parameters of practical importance (i.e. swell of the liquid phase and voidage) are shown.

On a mis au point un modele mecanistique atin de decrire I'histoire de la pression lorsque les reservoirs, remplis initialement de liquide saturc, sont soumis a une depressurisation soudaine. Une equation basee sur un bilan de volume a ete etablie. Les termes de cette equation gouvernant le nombre de bulles et la vitesse de croissance avant et apres le depart a partir de la surface d'ebullition ont ete calcules. Des constantes deerivant la surface d'ebullition sont necessaires et calculees a partir du travail experimental. Les resultats du modele sont compares aux resultats a des faibles pressions initiales (< 400 kPa) et un accord raisonnable est obtenu. Les resultats obtenus pour d'autres parametres d'importance pratique (p. ex., gonflement de la phase liquide et degre de vide) sont presentes.