Abstract
The present study establishes the link between the well-known Nielsen model for the calculation of tortuosity in polymer-filled systems and the Darcy-Brinkman equation for flows in porous media. Based on the fact that the polymer-filled system is a porous medium, with properties fixed by the volume fraction and the geometry of the fillers, we employ the Darcy-Brinkman equations to compute an expression for tortuosity. This expression is then directly linked to the interphasial drag coefficient. Finally, we prove that the Nielsen model constitutes a special case of our derived formula.
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