In the last decade, a few of early attempts to bring CFD-DEM fluidized beds beyond limits small, lab-scale units larger scale systems have become popular. The simulation capabilities Discrete Element Method in multiphase flow and largely benefitted by improvements offered coarse graining approaches. fact, number real particles that can be simulated increases point pilot-scale some industrially ...

Between 1830 and 1950 much of northeastern Puerto Rico was cleared for agriculture. Runoff increased by 50% and sediment supply to the river channels increased by more than an order of magnitude. Much of the land clearance extended to steep valley slopes, resulting in widespread gullying and landslides and a large load of coarse sediments delivered to the stream channels. A shift from agricultu...

Waters flowing in natural streams and rivers have the ability to scour and to deposit materials, hence to change the bed topography. It is recognized that undular flows have great potential for sediment transport. In the present study, a fixed-bed model was used to investigate the spatial variations of boundary shear stress under standing waves (i.e., undular flow). The results (Figure 8) highl...

Rivers are important water resources for human life, but sometimes cause irreparable damages. The flood plains are fertile terrains which are endangered by flood. Flood hazard mapping is one of the basic methods in flood fighting. In order to decline flood damages, the simulation of the hydraulic behavior of the rivers during flood occurrence is very important. In this study, areas that are flo...

Braided rivers are widespread in nature, and their bed morphology is complex variable. This paper aims to investigate quantitatively analyze the surface roughness of braided utilizing statistical theory. In this paper, a physical model developed, four constant discharge experiments carried out. Based on Structure-from-Motion photogrammetry direct measurement bedload transport using load cell, d...

In this paper design and fabrication of compact fluidized bed gasifier with increased gas – solid interaction is proposed for automotive vehicle. The aim of the design is generate a nitrogen (N2) free product gas with low tars and fines content. Firstly a compact size gasifier with fluidized bed is designed and after that it fabricated. Design was done with the help of CATIA design/modeling sof...