Abstract
In this paper, we modify the thermodynamically compatible third-grade fluid model by introducing a shear-rate- and volume-fraction-dependent viscosity into the equation. With this new model, it is possible to predict not only the normal stress differences, but also the variable viscosity observed in many suspensions. We study the Couette–Poiseuille flow of such a fluid between two horizontal flat plates. The steady fully developed flow equations are made dimensionless and are solved numerically; the effects of different dimensionless numbers are discussed.
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Notes
Morgan [29] suggested that in general, an implicit constitutive equation is a relation between a kinetic tensor (for example the stress tensor T) and one kinematic tensor (for example B, or D) of the types [see Eqs. (3.5) and (3.6) of that paper]: \(\mathbf{G(T,B)}=\mathbf{0};\;\mathbf{H(T,D)}=\mathbf{0}\).
Criminale et al. [3] obtained an expression for T, valid for any laminar shear flow:
$$\begin{aligned} \mathbf{T}=-p\mathbf{I}+\beta _1 \mathbf{A}_\mathbf{1} +\beta _2 \mathbf{A}_\mathbf{2} +\beta _3 \left( {\mathbf{A}_\mathbf{1}^\mathbf{2} +\frac{1}{2}\mathbf{A}_\mathbf{2} } \right) ;\qquad \qquad \qquad \qquad (*) \end{aligned}$$where \(\beta _{1}\), \(\beta _{2}\) and \(\beta _{3}\) are functions of \(\Pi \), where \(\Pi =\frac{1}{2}\mathrm{tr} \mathbf{A}_1^2 \) , and they are given by
$$\begin{aligned} \beta _1= & {} \gamma _1 +2\gamma _5 \Pi +4\gamma _7 \Pi ^{2},\\ \beta _2= & {} \gamma _2 +0.5\gamma _3 +2\left( {\gamma _4 +\gamma _6 } \right) +4\gamma _8 \Pi ^{2},\\ \beta _3= & {} \gamma _3 ,\\ \gamma _m= & {} \alpha _m \left( {2\Pi , 0, 4\Pi ^{2}, 8\Pi ^{3},\;0,\;2\Pi ^{2}, 0, 4\Pi ^{4}} \right) , \end{aligned}$$The model given by Eq. (*) is known as CEF model. It can be seen that when \(\beta _{2}\) = 2\(\beta _{3}\), this equation reduces to the Reiner–Rivlin fluid model [38, 39]. Now, since \(\beta _{1}\), \(\beta _{2}\) and \(\beta _{3}\) can be assigned arbitrarily as function of \(\Pi \), in theory, the CEF model can predict shear-thinning (or thickening) as well as normal stress effects.
Note that the simplest expression for the nonlinear behavior of fluids is that of the generalized power-law model where \(\mathbf{T}=-p\mathbf{I}+\mu _0 \left( {\mathrm{tr}\mathbf{A}_\mathbf{1}^\mathbf{2} } \right) ^{m}\mathbf{A}_\mathbf{1} \) when \(m < 0\), the fluid is shear thinning, and if \(m > 0\), the fluid is shear thickening. This equation is a subclass of the model presented here.
Abbreviations
- b :
-
Body force vector
- D :
-
Symmetric part of the velocity gradient
- g :
-
Acceleration due to gravity
- H :
-
Characteristic length
- l :
-
Identity tensor
- L :
-
Gradient of the velocity vector
- t :
-
Time
- T :
-
Cauchy’s stress tensor
- U :
-
Reference velocity
- x :
-
Spatial position occupied at time t
- y :
-
Direction normal to the inclined plane
- (Y) or \(\overline{y} \) :
-
Dimensionless y
- \(\phi \) :
-
Volume fraction
- div:
-
Divergence operator
- \(\nabla \) :
-
Gradient symbol
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Massoudi, M., Tran, P.X. The Couette–Poiseuille flow of a suspension modeled as a modified third-grade fluid. Arch Appl Mech 86, 921–932 (2016). https://doi.org/10.1007/s00419-015-1070-z
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DOI: https://doi.org/10.1007/s00419-015-1070-z