scholarly journals Experimental investigation of electro-rheological properties of modeled vegetable oils

2015 ◽  
Vol 53 (2) ◽  
pp. 1328-1337 ◽  
Author(s):  
S. Rubalya Valantina ◽  
D. Susan ◽  
S. Bavasri ◽  
V. Priyadarshini ◽  
R. Ramya Saraswathi ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
Rheological Properties ◽  
Vegetable Oils

Experimental investigation of cooling behavior and residual stresses for quenching with vegetable oils at different bath temperatures

2019 ◽  
Vol 216 ◽  
pp. 230-238 ◽  
Author(s):  
Pedro Brito ◽  
Pedro Augusto Ramos ◽  
Leandro Pegorete Resende ◽  
Douglas Antônio de Faria ◽  
Omar Khayyam Ribas
Keyword(s):  
Experimental Investigation ◽  
Residual Stresses ◽  
Vegetable Oils ◽  
Cooling Behavior

scholarly journals RHEOLOGICAL ANALYSIS OF VEGETABLE OILS USED FOR BIODIESEL PRODUCTION IN BRAZIL

2015 ◽  
Vol 14 (2) ◽  
pp. 31 ◽  
Author(s):  
L. E. Silva ◽  
C. A. C. Santos ◽  
J. E. S. Ribeiro ◽  
C. C. Souza ◽  
A. M. S. Sant’Ana
Keyword(s):  
Shear Stress ◽  
Rheological Properties ◽  
Vegetable Oils ◽  
Rheological Behavior ◽  
Apparent Viscosity ◽  
Biodiesel Production ◽  
Viscosity Data ◽  
Concentric Cylinder ◽  
Lower Shear ◽  
Different Temperatures

Rheology attempts to define a relationship between the stress acting on a given material and the resulting deformation and/or flow that takes place. Thus, the knowledge of rheological properties of fluid materials such as vegetable oils generates auxiliary data that can be used in its storage and application. In this context, the aim of this study was to evaluate the rheological behavior of vegetable oils (cotton, canola, sunflower, corn and soybean) at different temperatures, using four rheological models (Ostwald- de-Waelle, Herschel-Bulkley, Newton and Bingham). The rheological properties were determined using a Thermo Haake rheometer with concentric cylinder geometry. Measurements were taken at 30, 45 and 60 °C by controlling the temperature using a thermostatic bath coupled to the equipment. The software Rheowin Pro Job Manager was used for process control and data record. The rheograms were obtained by measuring the values of shear stress varying the shear rate from 100 to 600 s-1 within 250 seconds. For the analysis of the apparent viscosity at different shear rates was applied simple linear regression until 2nd degree with the aid of SAS (SAS/Stat 9.2) program. The apparent viscosity data were submitted to analysis of variance and the averages were compared by Tukey test at 5% of probability. Higher temperatures of the samples were correlated to lower shear stress values, hence lower values for viscosity and consistency index were obtained, since it is known that the density and viscosity are highly sensitive to temperature and that the increase in temperature results in reduction of viscosity, benefiting the fluid flow. The models of Newton and Ostwald-de-Waelle were chosen to evaluate the rheological behavior of the samples, showing a good fit for the rheological data.

Experimental investigation of the rheological properties of concentrated polymer solutions

1971 ◽  
Vol 13 (12) ◽  
pp. 3141-3148 ◽  
Author(s):  
G.V. Vinogradov ◽  
A.Ya. Malkin ◽  
G.V. Berezhnaya
Keyword(s):  
Experimental Investigation ◽  
Rheological Properties ◽  
Polymer Solutions

Theoretical and Empiriical Modeling of the Rheology of Fresh Cement Pastes

1992 ◽  
Vol 289 ◽  
Author(s):  
Gebran N. Karam
Keyword(s):  
Experimental Investigation ◽  
Rheological Properties ◽  
Empirical Model ◽  
General Framework ◽  
Theoretical Modeling ◽  
Empirical Modeling ◽  
Rheological Characteristics ◽  
Concentrated Suspensions ◽  
Cement Pastes ◽  
Semi Empirical

AbstractThe most important property of cements and concretes after strength is the workability, which is controlled by the rheological characteristics of the mix. Theoretical modeling having proved complicated and in some cases mathematically untractable, cement specialists have concentrated on empirical based models for the last two decades. The major theoretical contributions to date on the properties of colloidal and concentrated suspensions are summarized and a general framework for theoretical modeling of cement viscosity is established. The empirical modeling and the experimental investigation of the rheological properties of fresh cements are reviewed and discussed. A semi-empirical model is proposed and its validity tested in the interpretation of some published experimental results.

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