INTEC   05402
INSTITUTO DE DESARROLLO TECNOLOGICO PARA LA INDUSTRIA QUIMICA
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Multiple interconnected capillary tubes model for description of advanced features of capillary flow in paper strips.
Autor/es:
THOMAS DURIEZ; EMANUEL ELIZALDE; CLAUDIO L.A. BERLI; RAÚL URTEAGA
Lugar:
Sao Paulo
Reunión:
Workshop; VII Workshop em Microfluídica; 2017
Resumen:
Detailed study of capillary wicking in paper has become an important issue in the field of paper-based microfluidics. Based on a recent model of multiple interconnected capillary tubes presented by Cummins et al., we discuss the most appropriate pore size distribution to reproduce the experimental data. We demonstrate that this model can predict correctly the dynamic of the flow front under an exhausted reservoir condition. This phenomenon has not been discussed in literature previously and constitutes the major claim of this work. However, the model needs a suitable pore size distribution as an input in order to match experimental saturation curves. We use state-of-the-art machine learning tools to find a pore size distribution that justifies the observed features of capillary flow in filter paper strips. Experimentally, we measure the light transmittance of the paper strip as a function of time and position during wicking. Through a appropriate calibration this optical signal can be converted to porous medium saturation. The pore size distribution found can be used to reproduce all the dynamics along the different flow regimes.