Graetz number


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Graetz number

[′grets ‚nəm·bər]
(thermodynamics)
A dimensionless number used in the study of streamline flow, equal to the mass flow rate of a fluid times its specific heat at constant pressure divided by the product of its thermal conductivity and a characteristic length. Also spelled Grätz number. Symbolized NGz .
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7 460 Extruder screw speed (rpm) Graetz number (Gz) Griffiths number (G) Ratio (G/Gz) 10 0.
5 mm thick plaques, higher moduli occur as the Graetz number decreases as shown in Fig.
It is believed that VA is undergoing solidification in the molds when the Graetz number falls below 10.
obtaining higher moduli above a Graetz number of 10 may be related in part to the different stresses and rate of deformations that exist in filling the molds of three different thicknesses.
the stress and Graetz number, it appears doubtful that the molds could be scaled to a different thickness and yield the same properties.
c], of polymer in the center of the mold, and by using the definition for the Graetz number.
For a Graetz number of 10 and a dimensionless thickness (y/H) and length (z/L) of 0.
Correlating the flexural moduli to the Graetz number also failed to demonstrate that the optimum properties occurred at the same heat transfer condition.
This transition occurred at a Graetz number of [approximately] 10.
For this blend, it does appear that optimum mechanical properties can be found by changing the injection molding variables so that the Graetz number is in the vicinity of 10.
The shear stress, residence time, and Graetz number can be compared for molds of the same aspect ratio and for molds with the same length but with different thicknesses.