i Preface The report deals with development of reduced kinetic mechanisms for ammonia oxidation that can be used for CFD modeling of NO x formation in biomass combustors. A computer code CARM was tested for generation of the reduced mechanisms. Berkeley. We want to thank him for supplying us with the code, as well as helping us to get started. The report firstly describes shortly the general me...

Ferrochrome is the major chromium source for stainless steel production, and submerged-arc furnaces (SAF) are most commonly utilised to smelt chromite ores into ferrochrome by using suitable carbonaceous reductants such as coke. Because of the complexity of feed structure and electrical-thermal-chemical interactions, there exist large gradients and wide distributions of temperature, mineralogy ...

The design and optimization of photobioreactor(s) (PBR) benefit from the development robust quantitatively accurate computational fluid dynamics (CFD) models, which incorporate complex interplay fundamental phenomena. In present work, we propose a comprehensive model for tubular photobioreactors equipped with glass sponges. simulation requires minimum at least three submodels hydrodynamics, lig...

Three-dimensional computational fluid dynamics (CFD) modeling of the gasification performance in a one-stage, entrained-bed coal gasifier (Shell Coal Gasification Process (SCGP) gasifier) was performed, for the first time. The parametric study used various O2/coal and steam/coal ratios, and the modeling used a commercial code, ANSYS FLUENT. CFD modeling was conducted by solving the steady-state...

Soot concentration distribution is investigated both numerically and experimentally in methane-air diffusion flame. The experimental work is conducted with a cylindrical swirl stabilized combustor. Filter paper technique is used to measure soot volume fraction inside the combustor. The numerical simulation is based on the solution of the fully-coupled conservation equations for swirling turbule...

Previous studies indicated that the coupling of multizone and CFD (Computational Fluid Dynamics) models can provide a good compromise between the accuracy and required computation time. The results show that the coupled model predicts contaminant distribution more accurately than multizone model alone for the zones close to the contaminant source location. For all other zones, the multizone mod...

mixing is an important unit operation in many chemical engineering applications. nowadays, the jet mixing is widely used and going to be replaced with conventional mixers as a result of its simplicity, high performance and low costs. jet mixing in tanks has been investigated by many researchers. however, no comprehensive literature review exists. in the present review detailed investigation of ...

A coupled 3-D CFD and detailed chemical kinetics model of free-piston engine generator (FPEG) was adopted to investigate the effects initial parameters on homogeneous charge compression ignition (HCCI) combustion emission. Biodiesel with 115 species skeletal mechanism selected as fuel. Five different parameters, namely pressure, temperature, working frequency, ratio fuel equivalence ratio, were...

A parallel CFD code capable of simulating flow within moving boundaries is coupled to a beam element structural dynamics code. The coupled codes are used to simulate fluid-structure interaction for a class of applications involving long and slender structures, e.g., suspension bridges and offshore risers. Due to the difference in size and dimensionality of the 3D CFD problem on one side, and th...

An electronic representation of Sulzer’s Mellapak N250Y structured packing was generated by subjecting a physical packing element to CT scan. The resulting file was imported into a three-dimensional imaging program and then copied, translated, and rotated to create a stack of three packing elements. This stack was then inserted into an open-ended cylindrical surface to approximate a packed colu...