Engineering Physics Annotation << Back Redistribution of the Concentration of Monodispersed Nanoparticles in a Nanoliquid Flow Through a Flat Channel During its Heat Treatment Ryazhskikh A.V., Ryazhskikh V.I. Within the framework of the classical singlephase model of transport phenomena in nanofluids, an engineering approach has been synthesized for assessing the uniformity of the distribution of monodisperse nanoparticles in a laminar fl ow of a nanofluid during its heating/cooling in a horizontal fl at channel without nanoparticle adhesion on "wetted" surfaces. Assuming a stationary process and the averaged temperature profi le found from the solution of the Grätz-Lévy problem for a parabolic velocity profi le, an accurate analytical normalized relation for the transverse profi le of nanoparticle concentration, depending on the thermaldiffusion-diffusion and sedimentation-diffusion numbers, has been obtained. Analysis for the Al2 O3 +H2 O nanofluid during its thermal treatment in a flat microchannel has demonstrated its adequacy. Keywords: nanofluid, Brownian motion, thermophoresis, sedimentation, monodispersity, cooling/heating, fl at channel. DOI: 10.25791/infizik.7.2026.1567 Pp. 40-46.