Semianalytical model of optothermal fluidics in a confinement

Abstract

In this paper, we provide the semianalytical solution of the temperature and flow fields of a fluid confined in a narrow space between two parallel plates. The temperature increase is triggered by photothermal effects of fluids and/or boundaries due to the absorption of a focused Gaussian beam irradiated perpendicular to the fluid film, and then the temperature variation induces the flow fields through a buoyancy force and/or thermo-osmotic slip. The semianalytical solution to this optothermal fluidic system is validated by comparing with the results of numerical simulation, and is applied to typical optothermal fluidic problems. In particular, the optothermal trap of nanoparticles observed in our previous experiment [Tsuji, Electrophoresis 42, 2401 (2021)0173-083510.1002/elps.202100118] is investigated in terms of thermophoretic force and flow drag that are obtained semianalytically. The semianalytical solution can be shared through open-source codes that are available to researchers without the background of fluid mechanics.