Eventos Anais de eventos
COBEM 2017
24th ABCM International Congress of Mechanical Engineering
Are the cooling rate, the crystals morphology and the yield stress directly related in waxy oils?
Submission Author:
Diogo Elias da Vinha Andrade , RS
Co-Authors:
Moisés Marcelino Neto, Cezar Otaviano Ribeiro Negrao, Diogo Elias da Vinha Andrade
Presenter: Diogo Elias da Vinha Andrade
doi://10.26678/ABCM.COBEM2017.COB17-0505
Abstract
Crude oil gelation is a huge problem faced by the petroleum industry. At temperatures below the crystallization one, the precipitated crystals may entrap the oil into a gel-like structure. It is known that the thermal history influences on the rheological behaviour of waxy oils at low temperatures. In recent work it was showed that the cooling rate affects the supercooling presented in the precipitation of the first crystal in solution. The metastable zone width is directly related to the nucleation rate and, consequently, to the final crystals morphology. In the current work, by means of rheometric and microscopic experiments, it is analyzed the influence of the cooling rate on the crystals morphology and on the gel strength of a model waxy oil. It can be anticipated that it was observed a non-monotonic influence of the cooling rate on the critical stress of the tested waxy oil.
Keywords
waxy oils, rheometric experiments, cooling rate, crystal morphology, rheological properties
