The current research topics are: Enhancement of heat transfer in compact heat exchangers, e.g. radiators, oil coolers; numerical investigation of convective flow and heat transfer in complex narrow geometries e. g. cooling of combustor walls, recuperators and intercoolers in gas turbine system; combustion-related heat transfer, coupled conduction – convection – thermal radiation phenomena, evaporation in plate-and-frame-heat exchangers, application of thermal imaging techniques in heat transfer research, flow phenomena of importance for heat transfer, heat exchanger networks (process integration).
The main objectives of the research programme are to develop and apply numerical and experimental methods for investigation and analysis of fundamental heat transfer processes and fluid flow of relevance to both academia and industry.
Modern numerical computer codes have been developed and applied for a variety of situations, e.g., transient and steady laminar convective-conductive heat transfer, laminar and turbulent forced convection in complex narrow geometries, analytical-empirical methods for heat transfer in fluidized bed combustor.
The present computer facilities consist of several DEC workstations and network-connected X-terminals as well as PC:s. Through the computer network access is available to powerful computing facilities like a parallel processors computer. The multipurpose computer code CALCHT is applied and further developed. Also problem-oriented computer codes are developed and applied. For optimisation of heat exchanger networks by using the so-called pinch technology also an in-house code has been developed.
Commercially available codes, like CFX (FLOW3D), FLUENT and STAR-CD, are applied in investigations of industrial-related problems. For process integration access to the SUPER TARGET code is available.
For turbulent flows cases k-epsilon, non-linear k-epsilon models (high and low Reynolds number models), RNG-, RSM-models as well as algebraic stress models are considered. For determination of turbulent heat fluxes also a variety of models are investigated.
In the experimental projects, special purpose rigs are built for determining the thermal-hydraulic performance of enhanced surfaces. Imaging processing technique with liquid crystal thermography has recently been adopted. Hot wire anemometry using the streamline concept of Dantec is applied in some flow field experiments. Through other research groups within the department of Heat and Power Engineering LDV-systems are available to some extent.