Research Center for Engineering of
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Title: Rheological characterization of complex fluids in electro-magnetic fields
Published In: Journal of Non-Newtonian Fluid Mechanics, Vol. 154, pp. 22-30
Description: The paper is focused on the experimental investigations and rheologicalcharacterisations in magnetic and electric fields of liquids based on water in crude oils emulsions, added with ferrofluids (two types of crude oils are used in experiments: asphaltic and paraffinic, respectively). The final samples disclose weakly effects in the presence of magneticfield (saturated magnetization: Mn < 300 [G]) and behave almost as isolators in electric field (conductivity: s < 10-5 [S/m]). The main goal of the study is to explore to what extent rheometry of complexfluids in electric and magneticfields is able to offer value information about the internal structure of the samples. The experimental results prove that anomalous rheological behaviour (thixotropy, non-monotonic flow curve or viscosity function) of a complexfluid (in our case, emulsions based on paraffinic oil) generate also thixotropic properties and non-monotonic answers in the presence ferrofluids, under low magnetic and/or electric fields intensity. Our prospective study suggests that novel experimental procedures based on interaction: electro-magneticfield–complexfluids can be developed, in order to determine indirectly some relevant rheological properties of the complexfluids with internal network structure.
ISBN: 
ISSN:ISSN: 0377-0257
DOI:DOI:10.1016/j.jnnfm.2008.01.007
Publication year: 2008
Keywords:Complex fluids; Emulsions; Rheometry; Magneto-rheology; Electro-rheology; Thixotropy
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Authors: BALAN Corneliu , BROBOANA Diana , GHEORGHIU Eugen , VEKAS Ladislau ,
Type: International Journal Article
Link: http://www.sciencedirect.com/science/article/pii/S0377025708000128
Laboratory: Rheology Laboratory
Institution: UPT