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Details van artikel 5 van 8 gevonden artikelen
| Titel: |
EXACT ANALYSIS OF UNSTEADY CONVECTIVE DIFFUSION IN A SIMPLIFIED CROSS MODEL FLUID |
| Auteur: |
Ranganatha, T. R. Shashikala, S. G. |
| Verschenen in: |
Chemical engineering communications |
| Paginering: | Jaargang 195 (2008) nr. 6 pagina's 674-686 |
| Jaar: |
2008-06 |
| Inhoud: |
The article presents the effect of non-Newtonian viscosity on the longitudinal dispersion of tracer molecules released in an incompressible viscous non-Newtonian fluid (known as the simplified Cross model fluid) under the action of a constant pressure gradient. The Gill and Sankarasubramanian model is used to solve the unsteady convection diffusion equation for all time periods. An exact expression is obtained for the longitudinal convection coefficient K1(η*), which shows the effect of the non-Newtonian parameter η* on the centerline coefficient. It is seen that the value of the K1(η*) for η* > 1 is always smaller than the corresponding value for a Newtonian fluid. Also, the longitudinal dispersion coefficient of the solute K2(τ, η*) is determined exactly. The results show that the K2(τ, η*) asymptotically reaches a stationary state after a certain time. The effect of the η* on the most dominant dispersion coefficient is clearly depicted. Finally, the axial distribution of the average concentration θm of the solute over the channel cross section is determined at a fixed instant after the solute injection for several values of the η*. The results for “pure convection” are also reported |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 5 van 8 gevonden artikelen
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