Electro-rheological solids

Peel, D.J. Bullough, W.A. The Effect of Flow-rate, Excitation Level and Solids Content on the Time Response of an Electro-rheological Valve. J. Intel. Math Systems and Structures, Vol. 4, No.l (1993), pp. 54-64... 

The results of rheological and filtration properties are presented in Table 2 for all mud types. It is apparent from the results that a treated or untreated Itabirite mud systems has better rheological characteristics than a barite mud system (untreated or treated). This is due to the fewer inert solid particles in the itabirite mud system that cause less mechanical interaction and electro-chemical attraction between the active particles. With the addition of polymer at each concentration, lower PV and YP can be obtained with the Itabirite mud system than with barite. Therefore, the use of polymers In the Itabirite mud system were more compatible than in the barite mud. This advantage would enable the itabirite mud system to be tested with an even higher polymer concentration, overcoming the abrasion problem in the mud system. 

Abstract The physical properties, based on simulation results, of model fluids and solids bearing an electric or magnetic point dipole moment are described. Comparison is made with experimental data on ferrofluids and electro- or magneto-rheological fluids. The qualitative agreement between experiment and simulation shows the interest of these simple models for the comprehension of physical systems where the dipolar interaction dominates. 

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