| Abstract: | This paper examines the rationale behind the semiempirical formulation of a generalized viscoplastic fluid (GVF) model in the light of the Reiner-Rivlin constitutive theory and the viscoplastic theory, thereby identifying the parameters that control the rheology of granular flow. The shear-rate number (N) proves to be among the most significant parameters identified from the GVF model. As N ??? 0 and N ??? ???, the GVF model can reduce asymptotically to the theoretical stress versus shear-rate relations in the macroviscous and graininertia regimes, respectively, where the grain concentration (C) also plays a major role in the rheology of granular flow. Using available data obtained from the rotating-cylinder experiments of neutrally buoyant solid spheres dispersing in an interstitial fluid, the shear stress for granular flow in transition between the two regimes proves dependent on N and C in addition to some material constants, such as the coefficient of restitution. The insufficiency of data on rotating-cylinder experiments cannot presently allow the GVF model to predict how a granular flow may behave in the entire range of N; however, the analyzed data provide an insight on the interrelation among the relevant dimensionless parameters. |
| Genre: | Article |
| ProdID: | 70018458 |
| Citation Author: | Chen, C. -L.; Ling, C. -H. |
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| Citation End Page: | 479 |
| Citation Issue: | 5 |
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| Citation Language: | English |
| Citation Larger Work Title: | Journal of Engineering Mechanics |
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| Citation Number Of Pages: | 11 |
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| Citation Search Results Text: | Granular-flow rheology: Role of shear-rate number in transition regime; 1996; Article; Journal; Journal of Engineering Mechanics; Chen, C. -L.; Ling, C. -H. |
| Citation Start Page: | 469 |
| Citation Volume: | 122 |
| Citation Year: | 1996 |
| Type: | citation/reference |
| Text: | Granular-flow rheology: Role of shear-rate number in transition regime; 1996; Article; Journal; Journal of Engineering Mechanics; Chen, C. -L.; Ling, C. -H. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Mon, 1 Jan 1996 00:00 -0600 |
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