scholarly journals Helical tubular photobioreactor design using computational fluid dynamics

2020 ◽  
Vol 10 (1) ◽  
pp. 123-130
Author(s):  
Arnol Smith García Barbosa ◽  
Daniel Andres Antequera Cantillo ◽  
Juan Pablo Arango Restrepo ◽  
César Augusto Gómez Pérez ◽  
Jairo José Espinosa Oviedo
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Energy Consumption ◽  
Flow Direction ◽  
Minimum Energy ◽  
Radius Of Curvature ◽  
Minimum Energy Consumption ◽  
Computational Fluid Dynamics Cfd ◽  
Pumping Rates ◽  
Photobioreactor Design

In this paper we present the design problem of helical tubular PhotoBioReactors (PBR) based on energy consumption minimization, using the radius of curvature for the cultivation of microalgae. Computational Fluid Dynamics (CFD) is used to design a configuration of the helical pipeline with minimum energy consumption. We determined how flow direction changes affect energy consumption. Additionally, it was found that the radius of curvature affects the pressure drop in the PBR’s pipe, so a cost function has been developed to solve an optimization problem seeking to obtain the optimum radius of curvature and a helical tubular PBR design with low pumping rates.

Computational fluid dynamics (CFD) for “typical Dutch” houses failure: experiments and numerical modelling comparison.

2020 ◽  
Author(s):  
Manuel Andrés Díaz Loaiza ◽  
Benedikt Bratz ◽  
Jeremy Bricker ◽  
PAul Korswagen
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Numerical Model ◽  
Numerical Modelling ◽  
Flow Direction ◽  
Orientation Angle ◽  
Small Scale ◽  
Flow Conditions ◽  
Computational Fluid Dynamics Cfd ◽  
Multiple Variables

<p><strong>Computational fluid dynamics (CFD)  for “typical Dutch” houses failure: experiments and numerical modelling comparison.</strong></p><p>Authors: Andres Diaz Loaiza<sup>1</sup>, Benedikt Bratz<sup>1,2</sup>, Jeremy Bricker<sup>1</sup> and Paul Korswagen<sup>1</sup></p><p>1- Hydraulic Structures and Flood Risk, Technical University of Delft, 1- Technische Universität Braunschweig</p><p> </p><p>Coastal and riverine floods can be a catastrophic natural hazard with importance consequences. Many of the casualties occurring during these events can be attributed to the collapse of residential houses, and it is thus required to gain knowledge about the failure mechanism of these structures. Multiple variables can lead to various flow conditions that will in turn represent different load pressures over the house; among these, the type of the material (used in the construction), the orientation angle in respect to the main flow direction, the shape of the structure, and the urban density (blockage ratio), are relevant. In the present paper, small scale experiments are compared with CFD simulations performed with openFOAM in order to obtain a numerical model than can predict different combinations of load pressures for various flood events.</p><p> </p><p>The present study aims to represent different “typical Dutch” houses near or close to a dam break in which rapid high flow velocities and depths can be presented. The flow conditions and load pressures outputs are compared to physical results in order to validate the numerical model.</p>

Study of Erosion Behavior in Elbows Mounted in Series Using Computational Fluid Dynamics Method

2020 ◽  
Vol 142 (11) ◽  
Author(s):  
Zhenqiang Xie ◽  
Xuewen Cao ◽  
Juni Zhang ◽  
Xiaoyang Sun ◽  
Chenyang Fu ◽  
...  
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Stokes Number ◽  
Radius Of Curvature ◽  
Dean Number ◽  
Erosion Behavior ◽  
Pipeline Systems ◽  
In Series ◽  
Computational Fluid Dynamics Cfd ◽  
Erosion Zone

Abstract To date, numerous studies using experimental methods or computational fluid dynamics (CFD) simulations to investigate erosion in elbows have been published. However, most of these studies focused on erosion caused by large particles flowing through a single elbow, whereas erosion due to small particles in elbows mounted in series is largely ignored. Studying erosion in elbows mounted in series is essential for improving the design of pipeline systems. In this paper, a CFD model is developed and validated against experimental data in the literature. The effects of both the connecting length (i.e., the distance between two elbows connected in series) and the elbow radius of curvature on erosion behavior were investigated using the verified model. In addition, the Dean number and Stokes number were used to investigate particle motion. The results show that erosion in the second elbow first decreases and then increases, as the connecting length increases, and the maximum erosion zone always occurs in the first elbow. However, when the number of elbows is increased to four, interestingly, the maximum erosion zone is located in the fourth elbow. The findings are valuable and provide guidance for designing novel pipeline systems that can mitigate erosion.

Efficiency prediction for storage chambers using computational fluid dynamics

1996 ◽  
Vol 33 (9) ◽  
pp. 163-170 ◽  
Author(s):  
Virginia R. Stovin ◽  
Adrian J. Saul
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Shear Stress ◽  
Particle Tracking ◽  
Critical Value ◽  
Complex Geometries ◽  
Bed Shear Stress ◽  
Breadth Ratio ◽  
Computational Fluid Dynamics Cfd ◽  
Simulated Flow

Research was undertaken in order to identify possible methodologies for the prediction of sedimentation in storage chambers based on computational fluid dynamics (CFD). The Fluent CFD software was used to establish a numerical model of the flow field, on which further analysis was undertaken. Sedimentation was estimated from the simulated flow fields by two different methods. The first approach used the simulation to predict the bed shear stress distribution, with deposition being assumed for areas where the bed shear stress fell below a critical value (τcd). The value of τcd had previously been determined in the laboratory. Efficiency was then calculated as a function of the proportion of the chamber bed for which deposition had been predicted. The second method used the particle tracking facility in Fluent and efficiency was calculated from the proportion of particles that remained within the chamber. The results from the two techniques for efficiency are compared to data collected in a laboratory chamber. Three further simulations were then undertaken in order to investigate the influence of length to breadth ratio on chamber performance. The methodology presented here could be applied to complex geometries and full scale installations.

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