Séminaire de Mécanique d'Orsay

Le Jeudi 27 mai 2021 à 14h00 - Webinaire - le lien sera communiqué ultérieurement

Liquid-infused slippery surfaces to control turbulent heat transfer and friction

Shervin Bagheri
Linne FLOW Centre, Department of Engineering Mechanics, Royal Institute of Technology, Stockholm, Sweden

In order to reduce energy losses, there is a need for new surfaces that, in the presence of turbulence, are able to simultaneously control drag, heat and fouling. Slippery Liquid-Infused Porous Surfaces (SLIPS) have an untapped potential as multi-functional surfaces for turbulence. SLIPS, inspired by the peristome of the Nepenthes pitcher plant, have been tremendously successful for controlling droplets and flows in small channels. They can be tuned to reduce drag, enhance condensation and resist fouling and corrosion. However, compared to small laminar systems, turbulence exerts much larger shear stresses that also fluctuate chaotically. This makes SLIPS prone to shear-driven and pressure-driven drainage and considerably more challenging to design. In this talk, I show our efforts to understand precisely how to enhance stability and multi-functionality of SLIPS in the presence of turbulence. In particular, we demonstrate ; i) failure due to turbulence-driven capillary waves that develop on trapped lubricant and; ii) that by tuning the thermal properties of the solid and the infused liquid, the convective heat flux from the surface to the fluid can be enhanced, without increasing the drag.

Accès Webinaire - le lien sera communiqué ultérieurement