Anna-Lena Ljung

Ongoing Work

Drying phenomena for increased innovation in dishwashers

With a rather fundamental study on drying phenomena this project aims to increase the innovation towards energy efficient dishwashers. The work is conducted through a collaboration between AB Electrolux and Luleå University of Technology (LTU) with funding from VINNMER. The objective of the project is to study natural and forced convective drying of droplets, films and pools both numerically and experimentally in order to reveal the theoretical limitations.

Grate Aerodynamics– Study of process gas flows in Grate

The aim with this project is to study the fluid dynamic phenomena that arise in the Grate-Kiln process when the process gas enters the grate. Specific attention is given to how process gas, leakage, pellet bed, roasters and the design of the grate affects the flow profile and pressure drop above, below and through the pellet bed. The project is divided into two parts, a senior project with focus on the flow through the pellet bed and a PhD project focusing on the whole system including pellet bed, leakage etc. For more information see www.HLRC.se.

The Faste Laboratory

Project leader of RP3.2: Simulation Driven Product Development and Operation in the VINN Excellence center The Faste Laboratory.

New business agreements continuously raise new demands on companies research and development processes. This project focuses on how simulation tools shall be used, especially in the concept phase, to drive functional product development processes and to secure optimal operation. For more information see http://www.ltu.se/centres/Fastelaboratoriet-Vinnexc-Center.

Previous work

Drying of iron ore pellets

Iron ore pellets are a highly refined product and for companies such as LKAB it is important to constantly improve the pelletization in order to enhance production and improve product quality. A long term goal has been established to develop and considerably refine tools and techniques with which the drying zone can be optimized. The aim with this project is to numerically and experimentally investigate how material and processing parameters influence the drying. This will be applied to several scales: i) The constituents of the pellets and their properties and geometry. ii) The geometry of the pellet, their permeability and size distribution. iii) The geometry of the bed and the processing conditions including the state of the air (ex. humidity, temperature and velocity). Numerical models of convective and diffusion driven moisture transport are thus derived on several scales. Experimental studies are carried out in order to validate the models and to determine unknown material parameters. The latter will probably be done in cooperation with other HLRC-projects.