CFD analysis of large‐scale bioreactor conditions for guiding free‐flowing sensor development and operation

2020 ◽  
Vol 92 (9) ◽  
pp. 1244-1244
Author(s):  
P. Ho ◽  
B. Stute ◽  
E. von Lieres
Keyword(s):  
Large Scale ◽  
Cfd Analysis ◽  
Sensor Development ◽  
Large Scale Bioreactor

PROTOTIPE APLIKASI PENYIRAMAN TANAMAN MENGGUNAKAN SENSOR KELEMBABAN TANAH BERBASIS MICRO CONTOLLER ATMEGA 328

2019 ◽  
Vol 5 (1) ◽  
pp. 97-106
Author(s):  
Rudi Budi Agung ◽  
Muhammad Nur ◽  
Didi Sukayadi
Keyword(s):  
Soil Moisture ◽  
Growth And Development ◽  
Large Scale ◽  
Simple Method ◽  
Moisture Sensor ◽  
Sensor Development ◽  
Soil Moisture Sensor ◽  
Application Systems ◽  
Harvesting Systems ◽  
Working Principle

The Indonesian country which is famous for its tropical climate has now experienced a shift in two seasons (dry season and rainy season). This has an impact on cropping and harvesting systems among farmers. In large scale this is very influential considering that farmers in Indonesia are stilldependent on rainfall which results in soil moisture. Some types of plants that are very dependent on soil moisture will greatly require rainfall or water for growth and development. Through this research, researchers tried to make a prototype application for watering plants using ATMEGA328 microcontroller based soil moisture sensor. Development of application systems using the prototype method as a simple method which is the first step and can be developed again for large scale. The working principle of this prototype is simply that when soil moisture reaches a certainthreshold (above 56%) then the system will work by activating the watering system, if it is below 56% the system does not work or in other words soil moisture is considered sufficient for certain plant needs.

Large-Scale Bioreactor Pilots for Monitoring the Long-Term Hydromechanics of MSW

2013 ◽  
Vol 17 (4) ◽  
pp. 285-294 ◽  
Author(s):  
Matthias J. Staub ◽  
Jean-Pierre Gourc ◽  
Nicolas Drut ◽  
Guillaume Stoltz ◽  
Alicia A. Mansour
Keyword(s):  
Large Scale ◽  
Large Scale Bioreactor

Large-scale bioreactor production of the herbicide-degrading Aminobacter sp. strain MSH1

2013 ◽  
Vol 98 (5) ◽  
pp. 2335-2344 ◽  
Author(s):  
Nadja Schultz-Jensen ◽  
Berith E. Knudsen ◽  
Zuzana Frkova ◽  
Jens Aamand ◽  
Tina Johansen ◽  
...  
Keyword(s):  
Large Scale ◽  
Large Scale Bioreactor

CFD Analysis of a Solar Parabolic Dish

2015 ◽  
Vol 787 ◽  
pp. 280-284
Author(s):  
C. Uma Maheswari ◽  
R. Meenakshi Reddy
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Large Scale ◽  
Energy Markets ◽  
Solar Thermal ◽  
Cfd Analysis ◽  
Aluminium Copper ◽  
Parabolic Dish ◽  
Wind Velocities ◽  
Computational Fluid Dynamics Cfd

Concentrated solar thermal (CST) power has been used for years to help supply power to certain energy markets and has proven to be fairly successful. Unfortunately the high prices of these solar technologies have prohibited them from really making a large impact on the world's energy scene. This study analyses the structural, thermal, and CFD performance of a parabolic dish concept which could be the basis for large scale commercial concentrated solar thermal electricity. Simulation of the structural, thermal and CFDanalysis of the dish with varying metallic properties (Aluminium, Copper and StainlessSteel) under different windconditionswas compared. Computational Fluid Dynamics (CFD) was done to simulate the thermal performance of the dish at two different wind velocities.

Mass propagation of shoots of Stevia rebaudiana using a large scale bioreactor

1994 ◽  
Vol 13-13 (3-4) ◽  
Author(s):  
Motomu Akita ◽  
Takeo Shigeoka ◽  
Yoko Koizumi ◽  
Michio Kawamura
Keyword(s):  
Large Scale ◽  
Stevia Rebaudiana ◽  
Mass Propagation ◽  
Large Scale Bioreactor

Numerical Analysis on the Development of the Large-Scale Showerhead for Depositing AlGaInN Films

2013 ◽  
Author(s):  
Chulsoo Byun ◽  
Dae Hyeon Kim ◽  
Kang Woo Joo ◽  
Kwang-Sun Kim
Keyword(s):  
Large Scale ◽  
High Reliability ◽  
Chemical Vapor ◽  
Organic Chemical ◽  
Cfd Analysis ◽  
Mocvd Reactor ◽  
Process Gas ◽  
Metal Organic ◽  
Process Gases ◽  
Organic Chemical Vapor Deposition

The metal organic chemical vapor deposition (MOCVD) process is widely used to form a multi-layered structure with thin films for diverse semiconductor materials. The MOCVD process is the most promising method for manufacturing chips that are based on the compound semiconductor, but its technology is partly still insufficient. If a device, for example, lacks a non-uniformity related to the composition and thickness of the film, it decreases the reliability of the final product and affects the economics. To ensure that the equipment is competitive in the worldwide markets, a high reliability including the controllability of compositions is required for the equipment. In this study the CFD analysis was used to investigate the behavior of the process gas in a MOCVD reactor where the process gases including the component of the GaN films are injected as separated through a multi-module showerhead for eventually targeting multi-component films such as AlGaInN materials. After applying of Porous Media, a stabilization of process gas was confirmed from the results of pressure distribution.

scholarly journals Techno-Economic Analysis of Constant-Flow Woodchip Bioreactors

2021 ◽  
Vol 64 (5) ◽  
pp. 1545-1554
Author(s):  
Lindsey M. Hartfiel ◽  
Michelle L. Soupir ◽  
Kurt A. Rosentrater
Keyword(s):  
Economic Analysis ◽  
Large Scale ◽  
Removal Rate ◽  
Unit Cost ◽  
Cost Effective ◽  
Pilot Scale ◽  
Bypass Flow ◽  
Mass Removal ◽  
Low Probability ◽  
Large Scale Bioreactor

HighlightsTechno-economic analysis was performed for multiple scales of bioreactors operated under a variety of conditions.The unit cost decreased as the bioreactor size increased.The unit cost increased in bioreactors with longer HRTs and bypass flow due to reduced treatment capacity.One large bioreactor was more cost-effective than multiple smaller bioreactors.Abstract. Woodchip denitrification bioreactors are a relatively new, edge-of-field technology used to reduce nitrate-nitrogen (NO3-N) from subsurface tile drainage. The removal rate of nitrate is influenced by many factors, including temperature, dissolved oxygen, and hydraulic residence time (HRT). The objective of this study was to conduct a techno-economic analysis (TEA) for four scales of woodchip denitrification bioreactors operating at three HRTs (2, 8, and 16 h), designed with bypass flow or with a low probability of bypass flow, to determine the cost to remove 1 kg of NO3-N at each bioreactor scale and at each HRT. Several assumptions were made: the flow rate required to achieve a 2 h HRT on a per m3 basis could be achieved at all scales, the same mass removal of NO3-N was achieved on a per cubic meter basis, and the 2 h HRT did not have any bypass flow at each scale. With these assumptions, the lowest unit cost was observed for the large-scale bioreactor sized to have a low probability of bypass flow at 16 h HRT, with a resulting cost of $0.74 kg-1 NO3-N removed. The highest unit cost was observed for the pilot-scale bioreactor designed with bypass flow to achieve a 16 h HRT at a cost of $60.13 kg-1 NO3-N removed. At longer HRTs with bypass flow, a greater percent removal of nitrate has been observed with a lower mass removal rate. By having a low probability of bypass flow in the design, a higher mass removal and percent removal of nitrate were observed, leading to the above results. Contrasting this trend, the total and annual costs were highest for the large-scale bioreactor and lowest for the pilot-scale bioreactor. However, it was determined that 783%, 280%, and 54% increases in total cost for the pilot-, small-, and medium-scale bioreactors would be incurred to implement the number of bioreactors (66, 24, and 4, respectively) required to treat the same volume of flow as one large bioreactor. These results can be used to inform future design decisions and inform stakeholders of the approximate unit cost of installing a denitrifying woodchip bioreactor over a range of expected field conditions. While a larger bioreactor with a low probability of bypass flow may represent a more cost-effective investment, the potential for unintended, negative byproducts needs to be considered in the design. Keywords: Denitrification, Nitrate, Tile drainage, Water quality, Woodchip bioreactor.

Effect of Partial Admission and Swirl Brakes on Destabilization Force of Labyrinth Gas Seal

2020 ◽  
Author(s):  
Makoto Iwasaki ◽  
Rimpei Kawashita ◽  
Naoto Omura ◽  
Kazuyuki Matsumoto ◽  
Kenichi Murata ◽  
...  
Keyword(s):  
Steady State ◽  
Steam Turbine ◽  
Large Scale ◽  
Labyrinth Seal ◽  
Cfd Analysis ◽  
Analysis Method ◽  
Labyrinth Seals ◽  
Fluid Force ◽  
Swirl Velocity ◽  
Partial Admission

Abstract Destabilization forces in labyrinth seals can cause subsynchronous vibration and many researchers have investigated the destabilization force under full admission (FA). It is known that partial admission (PA) can increase rotor instability, but there is little knowledge about seal fluid force under PA. In this study the experiment was conducted in order to confirm the effect of PA and swirl brakes (SB) on swirl velocity and destabilization force. For the experiment, a 500mm diameter rotor was used so that size of the labyrinth seal can be close to the large-scale steam turbine. According to the experimental results, it was found that (1) average swirl velocity and destabilization force under PA became larger than FA, (2) relationship between average swirl velocity and destabilization force under PA was almost same with that of FA, (3) seal fluid force under PA had anisotropy by the instant rotor position, (4) SB reduced 70% of swirl velocity and destabilization force under both FA and PA. Also it was found that CFD analysis could predict the effect of PA and SB on swirl velocity and seal fluid force. For predicting the effect of SB under FA, new steady state CFD analysis method applying frozen rotor interface at SB region was proposed.

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