### Abstract

Language | English |
---|---|

Article number | 083302 |

Number of pages | 24 |

Journal | Physical Review Fluids |

Volume | 3 |

Issue number | 8 |

DOIs | |

Publication status | Published - 6 Aug 2018 |

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### Keywords

- Newtonian fluid
- viscosity
- Carreau fluids
- Ellis fluids
- rivulets

### Cite this

*Physical Review Fluids*,

*3*(8), [083302]. https://doi.org/10.1103/PhysRevFluids.3.083302

}

*Physical Review Fluids*, vol. 3, no. 8, 083302. https://doi.org/10.1103/PhysRevFluids.3.083302

**Rivulet flow of generalized Newtonian fluids.** / Al Mukahal, F. H. H.; Duffy, B. R.; Wilson, S. K.

Research output: Contribution to journal › Article

TY - JOUR

T1 - Rivulet flow of generalized Newtonian fluids

AU - Al Mukahal, F. H. H.

AU - Duffy, B. R.

AU - Wilson, S. K.

PY - 2018/8/6

Y1 - 2018/8/6

N2 - Steady unidirectional gravity-driven flow of a uniform thin rivulet (i.e. a rivulet with small transverse aspect ratio) of a generalised Newtonian fluid down a vertical planar substrate is considered. The parametric solution for any generalised Newtonian fluid whose viscosity can be expressed as a function of the shear rate, and the explicit solution for any generalised Newtonian fluid whose viscosity can be expressed as a function of the extra stress are obtained. These general solutions are used to describe rivulet flow of Carreau and Ellis fluids, highlighting the similarities and differences between the behaviour of these two fluids. In addition, the general behaviour of rivulets of nearly Newtonian fluids and of rivulets with small or large prescribed flux, as well as the behaviour of rivulets of strongly shear-thinning Carreau and Ellis fluids, are also described. It is found that whereas the monotonic dependence of the viscosity of a Carreau fluid on its three non-dimensional parameters and of an Ellis fluid on two of its three non-dimensional parameters leads to the expected dependence of the behaviour of the rivulet on these parameters (namely that increasing the viscosity of the fluid leads to a larger rivulet), the non-monotonic dependence of the viscosity of an Ellis fluid on the non dimensional parameter that measures the degree of shear thinning leads to a more complicated dependence of the behaviour of the rivulet on this parameter. In particular, it is also found that when the maximum extra stress in the rivulet is sufficiently large a rivulet of an Ellis fluid in the strongly shear-thinning limit in which this parameter becomes large comprises two regions with different viscosities. In the general case of non-zero viscosity in the limit of large extra stress the two regions have different constant viscosities, whereas in the special case of zero viscosity in the limit of large extra stress one region has constant viscosity and the other has a non-constant power-law viscosity, leading to a plug-like velocity profile with large magnitude in the narrow central region of the rivulet.

AB - Steady unidirectional gravity-driven flow of a uniform thin rivulet (i.e. a rivulet with small transverse aspect ratio) of a generalised Newtonian fluid down a vertical planar substrate is considered. The parametric solution for any generalised Newtonian fluid whose viscosity can be expressed as a function of the shear rate, and the explicit solution for any generalised Newtonian fluid whose viscosity can be expressed as a function of the extra stress are obtained. These general solutions are used to describe rivulet flow of Carreau and Ellis fluids, highlighting the similarities and differences between the behaviour of these two fluids. In addition, the general behaviour of rivulets of nearly Newtonian fluids and of rivulets with small or large prescribed flux, as well as the behaviour of rivulets of strongly shear-thinning Carreau and Ellis fluids, are also described. It is found that whereas the monotonic dependence of the viscosity of a Carreau fluid on its three non-dimensional parameters and of an Ellis fluid on two of its three non-dimensional parameters leads to the expected dependence of the behaviour of the rivulet on these parameters (namely that increasing the viscosity of the fluid leads to a larger rivulet), the non-monotonic dependence of the viscosity of an Ellis fluid on the non dimensional parameter that measures the degree of shear thinning leads to a more complicated dependence of the behaviour of the rivulet on this parameter. In particular, it is also found that when the maximum extra stress in the rivulet is sufficiently large a rivulet of an Ellis fluid in the strongly shear-thinning limit in which this parameter becomes large comprises two regions with different viscosities. In the general case of non-zero viscosity in the limit of large extra stress the two regions have different constant viscosities, whereas in the special case of zero viscosity in the limit of large extra stress one region has constant viscosity and the other has a non-constant power-law viscosity, leading to a plug-like velocity profile with large magnitude in the narrow central region of the rivulet.

KW - Newtonian fluid

KW - viscosity

KW - Carreau fluids

KW - Ellis fluids

KW - rivulets

UR - https://journals.aps.org/prfluids/

U2 - 10.1103/PhysRevFluids.3.083302

DO - 10.1103/PhysRevFluids.3.083302

M3 - Article

VL - 3

JO - Physical Review Fluids

T2 - Physical Review Fluids

JF - Physical Review Fluids

SN - 2469-990X

IS - 8

M1 - 083302

ER -