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    STUDIA CHEMIA - Issue no. 4(I) / 2009  
         
  Article:   THE CONSTRUCTION AND CALIBRATION OF A ROTATING VISCOMETER.

Authors:  NICU BORŞ, ANDRA TĂMĂȘ, ZENO GROPŞIAN. 		 
       
         
  Abstract:  The paper describes the construction and calibration of a modified Couette rotating rheometer for the study of the hydraulic effects that are specific to the motion in ring-shaped spaces limited by two glass concentric cylinders; the inner cylinder is mechanically driven, the outer one is positioned by the balance which is established between the viscous friction force and the torsion force developed in the elastic muff used for its fixation.The measurement and adjustment of the rotation speed by modulating the frequency of the electric current are presented, as well as the measurement of the torsion moment on the outer cylinder, at different elongation forces and elastic muff thicknesses, in correlation with constructive-functional characteristics.

Keywords: coaxial cylinders, rotational rheometer, sheear rate, shear stress, torsion, viscosity
  
         
     
         
         
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