The purpose of this study is to develop an experimental data-based char particle gasification model in order assess the effects size, temperature and generation heating rate on global parameters. Also, effect initial porosity observed by performing parametrical numerical simulations. A continuum-based used solve inside a within external boundary layer. intrinsic CO2 reaction computed according ...

In the case of heterogeneous reactions, diffusion is the only mechanism, locally, of transport of species to and from a surface. Thus, accurate prediction of diffusive transport is a prerequisite for accurate prediction of the operation of devices in which heterogeneous reactions occur. Three different diffusion models are examined from the standpoint of both accuracy and efficiency. Two of the...

This work investigates the transient equilibration process when partially miscible ternary liquid mixtures of two different compositions are brought into contact with each other. Diffusional coupling effects are shown to become increasingly significant as the mixture compositions approach the meta-stable regions of the phase equilibrium diagrams. The proper modelling of coupled diffusion phenom...

The governing equations of three dimensional elasticity problems include the six Beltrami-Michell stress compatibility equations, the three differential equations of equilibrium, and the six material constitutive relations; and these are usually solved subject to the boundary conditions. The system of fifteen differential equations is usually difficult to solve, and simplified methods are usual...

When attacked by predators, flatfishes perform fast-starts that result in a rapid take-off from the ocean bottom on which they lie. High-speed video recordings of the blind side of flatfishes indicate that they expel a coherent jet of water from the blind-side opercular valve during take-off. Buccal pressure recordings in winter flounder (Pseudopleuronectes americanus) show that a buccal pressu...

We consider a system of partial differential equations describing mass transport in multicomponent isothermal compressible fluid. The diffusion fluxes obey the Fick–Onsager or Maxwell–Stefan closure approach. Mechanical forces result into one single convective mixture velocity, barycentric one, which obeys Navier–Stokes equations. thermodynamic pressure is defined by Gibbs–Duhem equation. Chemi...

An approximation procedure for the identiication of a nonlinear boundary heat transfer function in a one phase Stefan problem is presented. Alternatively the problem can be viewed as constructing a feedback control law for the control of the solidiication surface in the Stefan problem. The analysis is based on Hilbert space methods and convex analysis techniques. Numerical results combining two...

Department of Computer Science and Helsinki Institute for Information Technology HIIT, University of Helsinki, Finland Department of Knowledge Technologies, Jožef Stefan Institute, Ljubljana, Slovenia International Postgraduate School Jožef Stefan, Ljubljana, Slovenia Department of Biotechnology and Systems Biology, National Institute of Biology, Ljubljana, Slovenia Email: {laura.langohr, hannu...