Static mixer proposal for tubular photobioreactors to reduce mixing energy consumption and enhance light–dark cycles

2020 ◽  
Vol 96 (1) ◽  
pp. 113-124
Author(s):  
Yulánderson Salguero‐Rodríguez ◽  
C A Gómez‐Pérez ◽  
Juan P Arango‐Restrepo ◽  
Jairo Espinosa
Keyword(s):  
Energy Consumption ◽  
Static Mixer ◽  
Mixing Energy ◽  
Tubular Photobioreactors

scholarly journals Fouling Mitigation in Tubular Membranes by 3D-printed Twisted Tape Turbulence Promoters

2019 ◽  
Author(s):  
Matthias Wessling
Keyword(s):  
Energy Consumption ◽  
Membrane Filtration ◽  
Specific Energy Consumption ◽  
Twisted Tape ◽  
Static Mixer ◽  
Permeate Flux ◽  
Severe Problem ◽  
Static Mixers ◽  
3D Printed ◽  
Tubular Membranes

Despite intensive research, fouling remains a severe problem in membrane filtration. It is often controlled by applying turbulent flow which requires a higher energy consumption. So-called turbulence promoters or static mixers can be inserted into the flow channel of tubular membranes. They deflect the fluid, induce vortices, enhance particle back-transport and increase the shear rate at the membrane surface, thus mitigating fouling. However, little is known how the geometry of such turbulence promotors affects the reduction of fouling. We investigate how different 3D-printed mixer geometries affect fouling and improve the flux during filtration with humic acid. Most mixer geometries used in the present study are based on a twisted tape; a Kenics static mixer is investigated as well. Static mixers with changing diameter prove to be less effective than twisted tape mixers with constant diameter which lead to an increase in permeate flux of around 130%. The highest flux improvement of 140% can be reached by applying a Kenics mixer. Regardless of their geometry, all investigated static mixer cause higher permeate fluxes at same specific energy consumption. Again, the Kenics mixer proves to be the most efficient static mixer. The presented mixer geometries can be fabricated with undercut injection molding techniques and represent a simple and viable option to make tubular membrane based filtration processes more efficient.

Correlations for mixing energy in processes using Rushton turbine mixer‡

2016 ◽  
Vol 70 (6) ◽  
Author(s):  
Grzegorz Story ◽  
Marian Kordas ◽  
Rafał Rakoczy
Keyword(s):  
Energy Consumption ◽  
Mixing Time ◽  
Power Input ◽  
Rotating Magnetic Field ◽  
Mixing Process ◽  
Total Energy Consumption ◽  
Innovative Strategy ◽  
Rushton Turbine ◽  
Mixing Energy ◽  
Dimensionless Energy

AbstractThis study reports the research results on a mixing process using a stirred tank mixer under the action of a rotating magnetic field (RMF). Dimensionless correlations are proposed to predict the power consumption and mixing time for the mixing systems analysed. The results suggest that the mixing behaviour of the experimental set-ups tested may be assessed using the dimensionless mixing energy as the product of the power input and mixing time. In addition, an innovative strategy is proposed on the basis of the synergistic effect of the rotational Rushton turbine and the RMF generator. The values of the dimensionless energy thus obtained were used to compare the mixing process performed by the mixing devices tested. It is shown that the mixing process under the RMF action has significantly higher values of energy consumption than the conventional Rushton turbine. The total energy consumption for the mixing process performed by the RMF mixer may be reduced by concomitant use of a rotational agitator.

scholarly journals Influence of the Mixing Energy Consumption Affecting Coagulation and Floc Aggregation

2017 ◽  
Vol 51 (6) ◽  
pp. 3480-3489 ◽  
Author(s):  
Yamuna S. Vadasarukkai ◽  
Graham A. Gagnon
Keyword(s):  
Energy Consumption ◽  
Mixing Energy

Effect of the Technological Additives on the Properties of Recycled Polyolefins

2019 ◽  
Vol 816 ◽  
pp. 90-95 ◽  
Author(s):  
Svetoslav Isaakovich Volfson ◽  
Larisa Yuryevna Zakirova ◽  
Yulia Sergeevna Karaseva ◽  
Alina Ildusovna Nigmatullina
Keyword(s):  
Thermal Properties ◽  
Energy Consumption ◽  
Surface Defects ◽  
Melt Flow Index ◽  
Flow Index ◽  
Shear Stresses ◽  
Technological Properties ◽  
Melt Flow ◽  
Processing Equipment ◽  
Mixing Energy

Recycling of polymers is an important environmental task. However, during the recycling of polymers many technological problems arise because usually not only one polymer, but also mixtures of polymers are recycled. To improve technological properties, such as increasing fluidity, improving processability and quality, reducing the melt pressure in the spinneret head, addressing surface defects caused by viscosity anomaly and excessive shear stresses, preventing the formation of deposits and residue on the forming tool, increasing productivity, reducing the amount gelic, etc., use processing and technological additives. In the research, the effect of technological additives manufactured by Weihai CY Dendrimer Technology Co., Ltd (China) on the technological and thermal properties of recycled polyolefins was studied. It was shown that the technological additives improved the technological properties of recycled polymers: the mixing energy decreased when receiving compositions, the melt flow index values increased, the thermal properties did not deteriorate. The results show the possibility of using of the technological additives in production to increase the productivity of processing equipment and reducing its energy consumption.

Lay Perceptions of Energy Consumption

2009 ◽  
Author(s):  
Shahzeen Z. Attari ◽  
Michael L. DeKay ◽  
Cliff I. Davidson ◽  
Wandi Bruine de Bruin
Keyword(s):  
Energy Consumption ◽  
Lay Perceptions

Study on Energy Consumption by Land Cargo Transportation

ICCTP 2009 ◽  
2009 ◽  
Author(s):  
Shunquan Huang ◽  
Siqin Yu ◽  
Zhongmin Liu
Keyword(s):  
Energy Consumption ◽  
Cargo Transportation
Sign in / Sign up

Export Citation Format

Share Document