Browsing NTNU Open by Author "Umeki, Kentaro"
Now showing items 1-4 of 4
-
Computational fluid dynamic simulations of thermochemical conversion of pulverized biomass in a dilute flow using spheroidal approximation
Guo, Ning; García Llamas, Ángel David; Li, Tian; Umeki, Kentaro; Gebart, Rikard; Løvås, Terese (Peer reviewed; Journal article, 2020)A drag force model for spheroids, referred as the spheroid model, was implemented in OpenFOAM, in order to better predict the thermochemical conversion of pulverized biomass. Our previous work has found that the spheroid ... -
The effect of Stefan flow on Nusselt number and drag coefficient of spherical particles in non-isothermal gas flow
Jayawickrama, Thamali R.; Haugen, Nils Erland L; Bäbler, Matthâus Ulrich; Chishty, Muhammad Aqib; Umeki, Kentaro (Peer reviewed; Journal article, 2021)A Stefan flow can be generated during a phase change or reactions of a particle immersed in a fluid. This study investigates the effect of Stefan flow on the exchange of momentum (drag coefficient (CD)) and heat transfer ... -
Supercritical extraction and microwave activation of wood wastes for enhanced syngas production and generation of fullerene-like soot particles
Trubetskaya, Anna; Hunt, Andrew J.; Budarin, Vitaliy L.; Attard, Thomas M.; Kling, Jens; Surup, Gerrit Ralf; Arshadi, Mehrdad; Umeki, Kentaro (Peer reviewed; Journal article, 2020)This work demonstrated that supercritical carbon dioxide extraction is effective as a pre-treatment technology to generate soot particles with the fullerene-like structure and increase syngas yield from extracted residues ... -
The effect of Stefan flow on the drag coefficient of spherical particles in a gas flow
Jayawickrama, Thamali R.; Haugen, Nils Erland L; Bäbler, Matthâus Ulrich; Chishty, Muhammad Aqib; Umeki, Kentaro (Journal article; Peer reviewed, 2019)Particle laden flows with reactive particles are common in industrial applications. Chemical reactions inside the particle can generate a Stefan flow that affects heat, mass and momentum transfer between the particle and ...