<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body style="overflow-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;"><meta http-equiv="content-type" content="text/html; charset=utf-8"><div style="overflow-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;"><div style="font-family: HelveticaNeue;"><font face="HelveticaNeue">Dear Soft Matter & Complex Systems Colleagues and Friends,</font></div><div><div style="font-family: HelveticaNeue;"><font face="HelveticaNeue"><br></font></div><div style="font-family: HelveticaNeue;"><font face="HelveticaNeue">On Friday 7 November 2025 at 9:30 AM at the UW Faculty of Physics (Pasteura 5, Warsaw; room 1.40) we are hosting a seminar, during which </font></div><div style="font-family: HelveticaNeue;"><font face="HelveticaNeue"><br></font></div><div style="font-family: HelveticaNeue; margin: 0px; font-width: normal; line-height: normal; min-height: 14px;"><font face="HelveticaNeue"><b>Tomasz Szawełło</b></font><font face="HelveticaNeue"><b> </b>(IFT UW</font><font face="HelveticaNeue">)</font></div><div style="font-family: HelveticaNeue; margin: 0px; font-width: normal; line-height: normal; min-height: 14px;"><font face="HelveticaNeue"><br></font></div><div style="font-family: HelveticaNeue; margin: 0px; font-width: normal; line-height: normal;"><font face="HelveticaNeue">will give a talk</font></div><div style="margin: 0px; font-width: normal; line-height: normal; min-height: 14px;"><div><h2 style="margin: 6px 0px 12px; padding: 0px;"><font face="HelveticaNeue"><span style="font-size: 12px;">Diffusive transport in network models of dissolution in porous media</span></font></h2><h2 style="font-family: HelveticaNeue; margin: 6px 0px 12px; padding: 0px;"><b style="caret-color: rgb(68, 68, 68);"><font face="HelveticaNeue" style="font-size: 12px;">Abstract</font></b></h2></div><div><div><div><font face="HelveticaNeue">Dissolution in porous media emerges from the interplay of fluid flow, reactant transport, chemical reactions, and evolving structure. Reactant transport combines advection and diffusion: advection promotes channeling instabilities, whereas diffusion stabilizes fronts. Pore network models provide an efficient framework to simulate dissolution, but often assume advection-dominated axial transport in pores—an assumption frequently violated in natural and industrial systems such as groundwater flows or catalytic reactors.</font></div><div><font face="HelveticaNeue">In this seminar I first motivate the need to include axial diffusion in pore network models and derive the classical Graetz solution for advection–reaction in a cylindrical pore with reactive walls. I next show how retaining axial diffusion modifies the solution structure, inducing additional dependence on Damköhler and Péclet numbers. Building on this, I present a solution to the 1D advection–diffusion–reaction problem for pores in the network that incorporates axial diffusion. Finally, I map dissolution outcomes on Damköhler–Péclet phase diagrams, highlighting transitions in morphology and comparing them with laboratory benchmarks.</font></div></div><div style="font-family: HelveticaNeue;"><br></div></div><div style="font-family: HelveticaNeue;"><br></div></div><div style="font-family: HelveticaNeue; margin: 0px; font-width: normal; line-height: normal;"><font face="HelveticaNeue">We warmly welcome everyone to attend the talk and the Soft Matter Coffee Break after the seminar, held in room 2.63 (2nd floor).</font></div></div><div style="font-family: HelveticaNeue;"><font face="HelveticaNeue"><br></font></div><div style="font-family: HelveticaNeue;"><div dir="auto" style="overflow-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;"><div style="margin: 0px; font-width: normal; line-height: normal;"><font face="HelveticaNeue">Maria Ekiel-Jeżewska</font></div><div style="margin: 0px; font-width: normal; line-height: normal;"><font face="HelveticaNeue">Maciej Lisicki</font></div><div style="margin: 0px; font-width: normal; line-height: normal;"><font face="HelveticaNeue">Piotr Szymczak</font></div><div style="margin: 0px; font-width: normal; line-height: normal;"><font face="HelveticaNeue">Panagiotis Theodorakis</font></div></div></div></div></body></html>