Dynamics of liquid imbibition through partially soluble porous sheets
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JMST Advances (2020) 2:53–59 https://doi.org/10.1007/s42791-020-00033-5
LETTER
Dynamics of liquid imbibition through partially soluble porous sheets Sohyun Jung1 · Wonjung Kim2 · Ho‑Young Kim1 Received: 31 March 2020 / Revised: 14 July 2020 / Accepted: 16 July 2020 / Published online: 7 August 2020 © The Korean Society of Mechanical Engineers 2020
Abstract We investigate the dynamics of liquid imbibition through partially soluble porous sheets. Using a polymeric porous sheet composed of polyethylene oxide (PEO) nanofibers, we examine the imbibition of mixtures of ethylene glycol (EG) that does not dissolve PEO and water that dissolves PEO. For aqueous EG mixtures with a concentration of greater than 70 wt% that only partially dissolves a PEO nanofibrous sheet, imbibition with dissolution is markedly slower than without dissolution. By developing a mathematical model to predict the imbibition velocity, we elucidate how dissolution changes the viscosity of the invading liquid and affects the dynamics of imbibition. This study guides us to extend the classical theoretical framework for liquid imbibition through porous media to complex porous media involving dissolution. Thus, a useful background is provided for long-term drug delivery using partially soluble porous materials and for engineering processes, such as geological sequestration and exploration, and coffee percolation. Graphic abstract
Keywords Capillary flows · Porous media · Dissolution
1 Introduction Fluid flow through porous media has been extensively investigated over a century since the pioneering work by Darcy [1], and physical principles of capillary imbibition through simple porous media were elucidated decades ago [2–4]. * Wonjung Kim [email protected] * Ho‑Young Kim [email protected] 1
Department of Mechanical Engineering, Seoul National University, Seoul 08826, Korea
Department of Mechanical Engineering, Sogang University, Seoul 04107, Korea
2
However, researchers have only recently focused on liquid imbibition through complex porous media, for instance, with multi-scaled pores [5, 6] and deformable pores by swelling [7] or dissolution of porous media [8]. The understanding of liquid imbibition in soluble porous media is crucial for engineering applications, such as geological sequestration [9] and exploration [10], coffee percolation [11], and microfluidics [12]. In particular, there is growing interest in techniques for long-term drug delivery using porous materials [13], and some research groups reported the role of porosity [14], dynamic swelling [15], and dissolution of the porous polymer [16] in the drug release rate. Although many studies have addressed dissolution mechanisms, the dynamics of liquid flow through
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porous media affecting drug release rate remains far from clear. Here, we report an experimental investigation of the capillary imbibition of aqueous ethylene glycol (EG) mixture through a porous sheet composed of polyethylene oxide (PEO) nanofibers. Whi
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