Assessment of the fluid-dynamic and acoustic behaviour of a swirl static mixer for after-treatment systems

2022 ◽  
Vol 186 ◽  
pp. 108446
Author(s):  
A.J. Torregrosa ◽  
A. Broatch ◽  
P. Quintero ◽  
Á. Redondo ◽  
F. Morin
Keyword(s):  
Fluid Dynamic ◽  
Static Mixer ◽  
Acoustic Behaviour

Quantitative Mixing Analysis of Laminar Flow in Circle Grid Perforated Plate with 50% Porosity Static Mixer

2014 ◽  
Vol 541-542 ◽  
pp. 836-840 ◽  
Author(s):  
Mat Loddin Mohd Zamadi ◽  
Amir Khalid ◽  
Bukhari Manshoor
Keyword(s):  
Laminar Flow ◽  
Fluid Dynamic ◽  
Perforated Plate ◽  
Reynolds Numbers ◽  
Manufacturing Cost ◽  
Static Mixer ◽  
New Approach ◽  
Static Mixers ◽  
Ansys Cfx ◽  
Research Findings

The applications of the static mixers are widely applied in many industries to obtain the desired type of mixing. In this context, to perform the mixing process should have two different fluids that also have different properties which will combines it in a single equipment to make an another fluid. The main objective of this research study is to propose a new approach of fractal concept (circle grid perforated plate) for internal rapid mixing by determining the coefficient of variation (COV). This study was implemented by fully numerical simulations. The simulations of mixing fluid were carried out with the help of commercial computational fluid dynamic (CFD) package ANSYS CFX 14.0 software. The simulation was done primarily in cylindrical pipe with insertions of circle grid perforated plate with porosity of 50%. Three levels of laminar flow have been chosen to result in Reynolds numbers (Re) equal to 100, 200 and 400. The effectiveness of circle grid perforated plate static mixer has been evaluated by comparing the homogeneity level of mixing fluids to the Kenics static mixer that readily available in industries applications. Based on the research findings, the COV value for circle grid perforated plate with 50% porosity at Re 100 was 0.0744 which is out of the range while Reynolds number at 200 and 400 were 0.0483 and 0.0247 respectively which are in the range in term of reasonable target of mixing homogeneity. The values of COV between 0.01 and 0.05 are the reasonable target for many applications. In term of manufacturing cost and energy loss due to static mixer, definitely this new approach of 50% porosity circle grid perforated plate is better design compared to the Kenics static mixer because of lower number of inserts and simpler design of static mixer to produce.

scholarly journals Granular flow in static mixers by coupled DEM/CFD approach

2016 ◽  
Vol 70 (5) ◽  
pp. 539-546 ◽  
Author(s):  
Lato Pezo ◽  
Milada Pezo ◽  
Aca Jovanovic ◽  
Nenad Kosanic ◽  
Aleksandar Petrovic ◽  
...  
Keyword(s):  
Granular Flow ◽  
Fluid Dynamic ◽  
Mixing Time ◽  
Numerical Approach ◽  
Mixing Efficiency ◽  
Multiphase Model ◽  
Static Mixer ◽  
Mixing Process ◽  
Static Mixers ◽  
Relative Standard

The mixing process greatly influence the mixing efficiency, as well as the quality and the price of the intermediate and/or the final product. Static mixer is used for premixing action before the main mixing process, for significant reduction of mixing time and energy consumption. This type of premixing action is not investigated in detail in the open literature. In this article, the novel numerical approach called Discrete Element Method is used for modelling of granular flow in multiple static mixer applications (1 - 3 Komax or Ross mixing elements were utilized), while the Computational Fluid Dynamic method was chosen for fluid flow modelling, using the Eulerian multiphase model. The main aim of this article is to predict the behaviour of granules being gravitationally transported in different mixer configuration and to choose the best configuration of the mixer taking into account the total particle path, the number of mixing elements and the quality of the obtained mixture. The results of the numerical simulations in the static mixers were compared to experimental results, the mixing quality is examined by RSD (relative standard deviation) criterion, and the effects on the mixer type and the number of mixing elements on mixing process were studied. The effects of the mixer type and the number of mixing elements on mixing process were studied using analysis of variance (ANOVA). Mathematical modelling is used for optimization of number of Ross and Komax segments in mixer in order to gain desirable mixing results.

scholarly journals Numerical Study of Viscous Fluid Flows in a Kenics Static Mixer

Mechanika ◽  
2020 ◽  
Vol 26 (3) ◽  
pp. 206-211
Author(s):  
Cherif BELHOUT ◽  
Mohamed BOUZIT ◽  
Brahim MENACER ◽  
Youcef KAMLA ◽  
Houari AMEUR
Keyword(s):  
Pressure Drop ◽  
Cfd Simulation ◽  
Numerical Study ◽  
Fluid Dynamic ◽  
Fluid Flows ◽  
Static Mixer ◽  
Static Mixers ◽  
Cosmetic Industry ◽  
Dynamic Software ◽  
Computational Fluid Dynamic Software

Since many years static mixers find usage in chemical, food, cosmetic and pharmaceutical industry. One of the most commonly used is the Kenics type static mixer. In a framework of the current work the CFD simulation for Kenics static mixer were performed. In food or cosmetic industry one must deal very often with non-Newtonian fluids. Therefore this work concerns the numerical study of non-Newtonian fluid flux in a kenics km static mixer with laminar flow using the Navier-Stocks equation governing the phenomenon and the pressure loss equation. This simulation was made using the computational fluid dynamic software (CFX 12.0). In this paper we studied the influence of the Reynolds number, the viscosity of the fluid, aspect ratio and the number of helical elements fixed on the pressure drop. It was found that the CFD results of pressure drop for non-Newtonian power law was similar to literature data (the correlation of C.D.GRACE 1971 and the numerical simulation of E.SAATDJIAN 2012).

COMPUTATIONAL FLUID DYNAMIC INVESTIGATIONS ON EFFECTS OF CIRCULAR ROD INSERTS IN FAST REACTOR FUEL BUNDLE

2018 ◽  
Author(s):  
G Padmakumar ◽  
K. Velusamy ◽  
Bhamidi V. S. S. S. Prasad ◽  
P Lijukrishnan ◽  
P. Selvaraj
Keyword(s):  
Fast Reactor ◽  
Computational Fluid Dynamic ◽  
Fluid Dynamic ◽  
Reactor Fuel ◽  
Fuel Bundle ◽  
Fast Reactor Fuel

Computational Fluid Dynamic Control

1989 ◽  
Author(s):  
Tom T. Hartley ◽  
Alex DeAbreu-Garcia
Keyword(s):  
Computational Fluid Dynamic ◽  
Fluid Dynamic ◽  
Dynamic Control

First Record of the Bush-Cricket Isophya Harzi (Orthoptera: Phaneropteridae) Outside its Locus Typicus

2012 ◽  
Vol 55 (2) ◽  
pp. 201-206 ◽  
Author(s):  
Ionuţ Ştefan Iorgu ◽  
Alexandru Ioan Tatu ◽  
Elena Iulia Iorgu
Keyword(s):  
First Record ◽  
Acoustic Behaviour ◽  
Bioacoustic Analysis ◽  
The Subject ◽  
Locus Typicus ◽  
Bush Cricket

Abstract During the period 2008-2012, the bush-cricket Isophya harzi Kis, 1960 has been the subject of several collecting trips in Cozia Mountains, where it was believed to be endemic, in order to study its acoustic behaviour. However, on a recent trip to Piatra Craiului Mountains, to study its Orthoptera fauna, I. harzi was surprisingly found in clearings and mountain steppe slopes covered with tall subalpine vegetation from Northern and Western areas. Bioacoustic analysis and some ecological notes are presented in the paper.

Sign in / Sign up

Export Citation Format

Share Document