Sökning: "Péclet number"

Hittade 2 uppsatser innehållade orden Péclet number.

1. 1. Nanoparticle Removal and Brownian Diffusion by Virus Removal Filters: Theoretical and Experimental Study

   Uppsats för yrkesexamina på avancerad nivå, Uppsala universitet/Nanoteknologi och funktionella material

   Författare :Olof Gustafsson; [2017]
   Nyckelord :virus removal filtration; Péclet number; nanocellulose; hydrodynamic constraint; convective capture; diffusion;

   Sammanfattning : This study aims to examine the throughput of nanoparticles through a Cladophora cellulose based virus removal filter. The effect of Brownian motion and flow velocity on the retention of 5 nm gold nanoparticles, 12.8 nm dextran nanoparticles and 28 nm ΦX174 bacteriophages was examined through MATLAB simulations and filtration experiments. LÄS MER

3. 2. Hydrodynamic simulations with a radiative surface

   Master-uppsats, Institutionen för astronomi

   Författare :Atefeh Barekat; [2013]
   Nyckelord :The Sun; Magnetohydrodynamics; radiative transfer;

   Sammanfattning : We solve the equations of radiation hydrodynamics to compute the time evolution toward one-dimensional equilibrium solutions using ageneralized Kramers opacity, κ=κ0 ρa Tb, with adjustable prefactor κ0 and exponents a and b on density ρ and temperature T, respectively. We choose our initial conditions to be isothermal and find that the early time evolution away from the isothermal state is fastest near the height where the optical depth is unity, and is slower both above and below it. LÄS MER