Speaker
Description
Forced evaporation of water from porous substrates is one of the oldest techniques humans have actively used for their own purposes with historical records reaching back more than 14000 years [1]. By now drying is ubiquitous in our daily lives for which we spend significant amount of our energy budget, be it for food preservation, inkjet printing, carbon capture and storage or polymer synthesis. Although it seems to be a simple process, we have only begun to understand the complexity of the underlying physical phenomena and their intricate coupling.
Especially within the porous substrates, we have to account for the formation of interfaces and their induced capillary suction, liquid and gas flows, localized evaporation cooling and heat transfer as well as stress on the solid matrix with potential fracturing. Depending on our application, transport of dissolved components and its influence on the fluid properties becomes significant, eventually leading to precipitation and inducing an in-situ change to the solid matrix geometry.
To better understand those multiscale phenomena we have developed model based on Darcy-type of flow, taking into account the relevant heat and mass transfer mechanisms. Additionally, we introduced a simple capillary model that enables the computation of the hydrodynamic properties of the porous media from arbitrary pore size distributions. With this model we have investigated, how the pore space geometry and fluid properties influence the redistribution of dissolved components throughout the drying process [2].
We also have obtained insights into the pore scale dynamics of water evaporation and film dynamics from micro-CT and AFM experiments which shed light on the fascinating mechanisms that control the local evaporation [3], precipitation and their coupling. We will present our models, as well as our results and discuss the potential for future research directions.
References:
[1] S. Bhattacharjee et. al. A critical review on drying of food materials: Recent progress and key challenges 2024 Int. Comm. Heat and Mass T. 107863
[2] D.R. Rieder et. al. Modeling the Drying Process of Porous Catalysts: Impact of the Pore Size Distribution 2023 I&ECR 62/46
[3] G. Wensink et. al. Spontaneous Imbibition and Evaporation in Rocks at the Nanometer Scale 2023 Energy & Fuels 37/23
| Country | Netherlands |
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