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** Rabinowitsch correction factor **

** Rabinowitsch correction, rheological **

** The Mooney-Weissenberg-Rabinowitsch equations **

** The Rabinowitsch-Mooney Relations **

** Viscometer Rabinowitsch correction **

** Weissenberg-Rabinowitsch correction **

Franck J and Rabinowitsch E 1934 Some remarks about free radicals and the photochemistry of solutions Trans. Faraday Soc. 30 120-31 [Pg.1618]

As part of the Rabinowitsch-Mooney analysis, it was shown that the volumetric flow rate can be written in terms of the shear stress distribution [Pg.123]

Paneth, F., E. Rabinowitsch u. W. Hacken fiber die Gruppe der fliich- [Pg.244]

The slope of this function is the Rabinowitsch [12] correction for the shear rate in terms of the power law parameter n [Pg.84]

The ratio (3 + l)/4n is called the Rabinowitsch Correction Factor and it is used to convert Newtonian shear rates to true shear rates. [Pg.372]

In order to determine the true shear rate at the wall it is necessary to use the Rabinowitsch-Mooney equation [Pg.106]

This must be done for each of a range of values of the wall shear stress tw. The standard Rabinowitsch-Mooney equation can then be used with the corrected values of uc [Pg.129]

For steady-state laminar flow of any time-independent viscous fluid, at average velocity V in a pipe of diameter D, the Rabinowitsch-Mooney relations give a general relationship for the shear rate at the pipe wall. [Pg.639]

The occurrence of slip invalidates all normal analyses because they assume that the velocity is zero at the wall. Returning to the Rabinowitsch-Mooney analysis, the total volumetric flow rate for laminar flow in a pipe is given by [Pg.126]

Figure 3.18 Apparent shear rate as a function of the wall stress (tJ. The first derivative of the function is used to perform the Weissenberg-Rabinowitsch correction. The data are for the HDPE resin at 190°C as shown in Fig. 3.17 |

Polymer melts are frequendy non-Newtonian. In this case the earlier expression given for the shear rate at the capillary wall does not hold. A correction factor (3n + 1)/4n, called the Rabinowitsch correction, must be appHed in such a way that equation 21 appHes, where 7 is the tme shear rate at the wall and nis 2l power law factor (eq. 22) determined from the slope of a log—log plot of the tme shear stress at the wad, T, vs 7. For a Newtonian hquid, n = 1. A tme apparent viscosity, Tj, can be calculated from equation 23. [Pg.183]

When data are available in the form of the flow rate-pressure gradient relationship obtained in a small diameter tube, direct scale-up for flow in larger pipes can be done. It is not necessary to determine the r-y curve with the true value of y calculated from the Rabinowitsch-Mooney equation (equation 3.20). [Pg.110]

The calculation of the shear rate at the capillary wall, 7 , is computed from the function slope of Fig 3.18 and the apparent shear rate using Eq. 3.36. The derivative of the function appears relatively constant over the shear stress range for Fig. 3.18. Many resin systems will have derivatives that vary from point to point. The corrected viscosity can then be obtained by dividing the shear stress at the wall by the shear rate i ,. Equation 3.36 is known as the Weissenberg-Rabinowitsch equation [9]. [Pg.84]

** Rabinowitsch correction factor **

** Rabinowitsch correction, rheological **

** The Mooney-Weissenberg-Rabinowitsch equations **

** The Rabinowitsch-Mooney Relations **

** Viscometer Rabinowitsch correction **

** Weissenberg-Rabinowitsch correction **

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