Introduction: One of the most important discoveries of the NEAR Shoemaker mission to Eros was the “ponds”, flat regions (relative to surrounding terrain) inside craters that exhibit a slightly bluer reflectance spectra than most of the asteroid [1]. Ponds have been interpreted as being composed of finer-grained material than the rest of the asteroid surface. Formation processes for ponds includ...

Blast furnace ironmaking is one of the most serious carbon dioxide emission processes. To reduce energy consumption and CO2 emissions, fluidized bed technology with hydrogen as a reducing agent has attracted more attention. An inclined agitator was added to reactor address sticking issue in conventional process. In this research, numerical simulation used examine impacts gas composition agitati...

Comparative analysis of the steady-state and transient properties a bubbling fluidized-bed catalytic reactor obtained according to different mathematical models emulsion zone was performed verify commonly used assumption regarding pseudohomogeneous nature this zone. Four dynamics were formulated, based on thermal diffusional conditions at gas-solid interface within catalyst pellet, namely model...

The pressure-controlled injection tool (PCIT) is the key equipment in process of high-pressure water jet fragmentation solid fluidization exploitation deep-sea natural gas hydrate (NGH). internal flow field erosion wear numerical simulation model PCIT established through computational fluid dynamics software to study influence law and main factors drilling PCIT. laws different physical paramete...

the presence of particles in liquid-solid fluidized beds enhances the bed heat transfer, because the movement of the particles leads to an increased turbulence in the system. moreover, the violent movement of the particles has a positive effect on fouling of the heat transfer surface. the aim of this investigation was to perform systematic measurements of bed voidage and heat transfer coefficie...

Gas solid fluidized bed application has gained popularity as an excellent contacting device that is been widely used in thermo-chemical processes, drying food processing industries etc. due to its favorable heat transfer characteristics. Most of the outmoded fluidization activities reported confined with columnar/cylindrical shaped reactors. Conventionally, tapered/conical reactors are for ener...

Soft-sphere discrete element method (DEM) and Navier-Stokes equations were coupled with equations of energy for gas and solids to investigate the process of agglomeration in fluidized bed of polyethylene particles at high temperature. The Newton’s second law of motion was adapted for translational and rotational motion of particles and agglomerates. The cohesive force for polyethylene particles...

Fluidized beds are used to gasify materials such as coal or biomass in the production of producer gas. Modeling these reactors using computational fluid dynamics is advantageous when performing parametric studies for design and scale-up. While two-dimensional simulations are easier to perform than threedimensional simulations, they may not capture the proper physics. This paper compares twoand ...

Fluidization of non-spherical particles is a common process in energy industries and chemical engineering. Understanding the fluidization important to guide relevant processes. There already have been numerous studies which investigate behaviors different during fluidization, but investigations polyhedral do not receive much attention. In this study, investigation described by polyhedron approa...