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An important prerequisite for process simulations of laser beam welding is the accurate depiction of the surface energy distribution. This requires capturing the optical effects of the laser beam occurring at the free surface. In this work, a novel optics ray tracing scheme is proposed which can handle the reflection and absorption dynamics associated with laser beam welding. Showcasing the applicability...
A theoretical study is carried out to obtain an analytical solution of free convective heat transfer for the flow of a polar fluid through a porous medium with variable permeability bounded by a semi-infinite vertical plate in a slip flow regime. A uniform magnetic field acts perpendicular to the porous surface. The free stream velocity follows an exponentially decreasing small perturbation law. Using...
Problem-based learning has been at the core of significant developments in engineering education in recent years. This term refers to any learning environment in which the problem drives the learning, because it is posed in such a way that students realize they need to acquire new knowledge before the problem can be solved. This paper presents the experience of a structured problem-based learning...
Relative contributions from particle conduction and gas convection to the heat transfer coefficient between gas-solid fluidized beds and surfaces are studied using experimentally measured values. The measurements were made over a wide range of fluidization conditions (d sv =56-1789 μm, U=0.02-2.6 m/s). This includes 18 different systems, i.e. five different materials (glass, sand, aluminum,...
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