The present work reports the results of an entropy generation analysis on a symmetric flow distributor. The entropy generation minimisation method (EGM) was applied in order to lower the intrinsic irreversibilities associated to the geometric configuration of the flow pattern, aiming to improve the uniformity of flow distribution. 3D Computational Fluid Dynamics (CFD) methods were used to simulate the flow conditions, including a local entropy generation model. The implementation of the entropy generation minimisation method enabled to achieve a significant optimisation of the original design.
- Inderscience Publishers
- Irreversibilities reduction of a flow distribution system by ...
Flow Energy Management: 3 Killer Apps to Lower Energy Costs
More and more, buzz words like “flow energy” or “flow energy management” have become prevalent as companies grapple to control costs, reduce energy use, and comply with government regulations—all while trying to increase profitability. But what are flow energy and flow energy management? Why should you care? In this three-part series, we will: Explore what flow energy is Discuss the applications and flow meters that really impact the bottom line Give tips and tricks for using...
Hydraulic simulation of perforated pipe systems feeding vertical flow constructed wetlands
For successfully operating a vertical flow constructed wetland, the uniform distribution of wastewater on the surface of the soil filter is essential. In research, however, this aspect is often overlooked. This study presents a methodology for assessing discharge uniformity from perforated pipe systems via hydraulic modeling. First, the requirements and conditions for the simulation of perforated pipe systems are investigated and the model basics are explained. Then the whole process of model build-up, calibration,...
Evaluation of alkalinity spatial distribution in an up-flow fixed bed anaerobic digester
In this paper, an experimental study upon alkalinity and hydrodynamic behavior in an anaerobic up-flow fixed bed reactor for the treatment of tequila vinasses is presented. Measurements of volatile fatty acids, pH, alkalinity and bicarbonate were obtained at three sampling points in the reactor in the axial axis. Then, the spatial distribution of alkalinity is studied and discussed. Moreover, for further control process purposes, a hydrodynamic model based on the use of two interconnected two-steps reduced AM2...
Release of hydrogen sulfide under intermittent flow conditions – the potential of simulation models
For engineering purposes it is especially useful to be able to predict and control sewer corrosion rates and odor impacts as well as to design effective measures aiming to reduce effects related to hydrogen sulfide formation and release. Doing so, it is important to use modeling tools that are capable of assessing variations of dissolved oxygen, dissolved sulfide and hydrogen sulfide gas concentrations for a wide range of environmental scenarios. Two such models were assessed: AEROSEPT, an empirical formulation,...
Sensitivity of groundwater flow with respect to the drain–aquifer leakage coefficient
Mitigation measures may be used to prevent soil and water pollution from waste disposal, landfill sites, septic or chemical storage tanks. Among them, drains and impervious barriers may be set up. The efficiency of this technique can be evaluated by means of groundwater modeling tools. The groundwater flow and the leakage drain–aquifer interactions are implemented in a conforming finite element method (FEM) and a mixed hybrid FEM (MHFEM) in a horizontal two-dimensional domain modeling regional aquifer below...