In this lecture, we report on the development of a numerical method aimed at simulation of heat transfer and flow of nanofluids. The developed algorithm is based on the boundary element method. Validity and accuracy of the method is presented on a flow around a cylinder.
B.04 Guest lecture
COBISS.SI-ID: 19246614The presented paper deals with numerical analysis of operating characteristics of a new axial fan design. Two different axial fan geometries with blades embedded in the hub at outer diameter of impeller are introduced. The air flow in axial fans usually flows across installed electric motor which drives the fan. This conventional design of axial fans decreases the air flow cross section area behind fan active part and generates a wake in air flow. In order to minimize the fan influence on air flow, two geometries of axial fans with blade embedded in the fan hub at the outer diameter of the impeller were tested in presented study. By placing (positioning) fan blades in the hub at outer diameter, effective air flow area behind fan was unchanged. Two types of spatially curved fan blades were tested in presented study. The proposed geometries of a new axial fan were tested numerical using commercial computational fluid dynamics program. Transient simulations were made using standard two equations SST turbulent model. The results of new axial fan geometries were compared to the results obtained with standard axial fan geometry. The decrease of cross section area caused an increase in air flow speed in active part of a standard geometry axial fan which influences the pressure and velocity fields before and after fan active part. The new proposed axial fans geometries have significant less impact on velocity and pressure fields before and after active part of the fan. This also influences the turbulent flow structure after fan active part which continues as a Von Karman vortex street. The significant improvements in air flow and fan characteristics were obtained using new proposed axial fan geometries. This indicates that the new proposed axial fan geometries have potential for further research and model tests.
B.03 Paper at an international scientific conference
COBISS.SI-ID: 18924310The importance of the use of thermal treatment in the waste management system at the regional level, which contributes to the introduction of these technologies into practice.
B.03 Paper at an international scientific conference
COBISS.SI-ID: 18625046Investigation of IR380 turbine operation using extraordinary large steel shot (shot diameter between 2 and 3 mm) was performed. Our own testing procedure presented in [ISSN 0955-5986] was applied. The basic shot jet characteristics and the shot velocity 1.35 m behind the turbine were measured in order to check if these are in accordance with the contractor demands.
F.14 Improvements to existing production methods and tools or processes
COBISS.SI-ID: 18513686Development of onedimensional and axisymmetrical 3D model of lyophilization based on Boundary Element Method, enabling computation of temporal dynamics of sublimation drying inside a single vial and in the conditions of vacuum. The developed numerical algorithms enable computation of primary drying phase with moving interface as well as desorptive moisture removal in the secondyra drying phase of lyophilization. In their design they are suitable for implementation inside the computational models for simulation of 3D conditions inside a shelf type lyophilizator. The research work was done in collaboration with company LEK d.d.
F.14 Improvements to existing production methods and tools or processes
COBISS.SI-ID: 19401238