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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. SymbolizedNGz.
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25) In order to account for entrance effects, the flow channel length averaged Sherwood number can be expressed as a function of the Graetz number for mass transfer in a circular tube with a correlation similar to that for heat transfer.
Effectiveness of desiccant coated regenerative wheels from transient ... by Shang, Wei; Besant, Robert W. / HVAC & R Research
The Graetz number is a measure of the importance of heat convection in the z-direction (along the centerline of the screw length) and is defined as [FIGURE 11 OMITTED] Graetz number (Gz) = QH/[alpha]BL.
The effect of screw geometry on melt temperature profile in single ... by Kelly, A.L.; Brown, E.C.; Coates, P.D. / Polymer Engineering and Science
15) Entrance Effects Simonson and Besant (1997) showed that the entrance effects in the flow channels of an energy wheel are usually small and will be negligible when the Graetz number for the flow channel length is large.
Theoretical and experimental methods for the sensible effectiveness ... by Shang, Wei; Besant, Robert W. / HVAC & R Research
 
 
 
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