scholarly journals Sorption-enhanced gasification (SEG) of agroforestry residues: Influence of feedstock and main operating variables on product gas quality

2022 ◽  
Vol 226 ◽  
pp. 107074
Author(s):  
Isabel Martínez ◽  
María S. Callén ◽  
Gemma Grasa ◽  
José M. López ◽  
Ramón Murillo
Keyword(s):  
Operating Variables ◽  
Product Gas ◽  
Main Operating

Development of a Visco-Plastic Lubricant Model for the Synthesis of High Pressure Rolling Contact Tractions

1979 ◽  
Vol 193 (1) ◽  
pp. 295-301 ◽  
Author(s):  
S. Lingard
Keyword(s):  
Elastohydrodynamic Lubrication ◽  
Rolling Contact ◽  
Point Contacts ◽  
Design Problems ◽  
Plastic Lubricant ◽  
Operating Variables ◽  
Transmission Design ◽  
Rolling Elements ◽  
Experimental Rolling ◽  
Main Operating

Experimental rolling contact traction data for the nominal point contacts of a steplessly variable ratio drive are presented. Operation is in the elastohydrodynamic lubrication regime with peak contact pressures of 1.5 to 3.0 GPa. Good agreement with the measurements is demonstrated by a visco-plastic lubricant model, and contrary to the conclusions of other recent work it is shown that the effects of elastic compliance of the fluid and rolling elements are small. The ability of the theory to account for the influence of the main operating variables, and its simplicity, should facilitate the solution of certain transmission design problems.

scholarly journals Single-Stroke Attachment of Sheets to Tube Ends Made from Dissimilar Materials

Materials ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 815
Author(s):  
Luis M. Alves ◽  
Tiago J. Reis ◽  
Rafael M. Afonso ◽  
Paulo A.F. Martins
Keyword(s):  
Numerical Simulation ◽  
Dissimilar Materials ◽  
Mechanical Interlocking ◽  
Forming Process ◽  
Operating Variables ◽  
Sheet Surface ◽  
New Process ◽  
Deformation Mechanics ◽  
Tube Expansion ◽  
Main Operating

This paper presents a new joining method by a forming process for attaching sheets to tube ends. The process consists of two different forming stages carried out sequentially in a single stroke. Firstly, the free tube end is flared by compression with a contoured die, then is squeezed (indented) against the sheet surface to create a mechanical interlocking. The new process is carried out at an ambient temperature and, in contrast to existing joining by forming operations based on tube expansion, it avoids seal welds, tube protrusions above the sheet surfaces, and machining of grooves on the sheet holes to obtain the form-fit joints. The paper starts by analyzing the process deformation mechanics and its main operating variables and finishes by presenting examples that demonstrate its effectiveness for attaching sheets to tube ends made from polyvinylchloride and aluminum. Experimental and numerical simulation work provides support to the presentation.

scholarly journals Analysis of a Hybrid Suspended-Supported Photocatalytic Reactor for the Treatment of Wastewater Containing Benzothiazole and Aniline

Water ◽  
2019 ◽  
Vol 11 (2) ◽  
pp. 337 ◽  
Author(s):  
Cristian Ferreiro ◽  
Natalia Villota ◽  
José Lombraña ◽  
María Rivero ◽  
Verónica Zúñiga ◽  
...  
Keyword(s):  
Industrial Effluent ◽  
Supported Catalyst ◽  
Operating Conditions ◽  
Energy Costs ◽  
Photocatalytic Reactor ◽  
Operating Variables ◽  
Ms Analysis ◽  
Photocatalytic Material ◽  
Main Operating

In this work, a study of the main operating variables affecting TiO2/UV photocatalysis was carried out. The treatment of an industrial effluent containing aniline and benzothiazole from the manufacture of accelerants for vulcanization was performed in a TiO2-supported commercial photoreactor. The degradation of both contaminants was monitored by GC-MS analysis. The proposed experiments were able to properly identify the phenomenon of adsorption, as well as to improve the performance of the commercial photoreactor by adding small amounts of TiO2 in suspension. The removal performance, durability of the photocatalytic material, and energy costs were analysed. The results showed that the use of suspensions intensifies the degradation obtaining an improvement of 23.15% with respect to the use of the supported catalyst. For an aniline and benzothiazole solution, the best operating conditions were found at pH = 12.0, introducing 60.0 mg L−1 of suspended TiO2 together with the existing supported catalyst.

scholarly journals Graphene-Based Catalysts for Ozone Processes to Decontaminate Water

Molecules ◽  
2019 ◽  
Vol 24 (19) ◽  
pp. 3438 ◽  
Author(s):  
Fernando J. Beltrán ◽  
Pedro M. Álvarez ◽  
Olga Gimeno
Keyword(s):  
Organic Pollutants ◽  
Advanced Oxidation Processes ◽  
Catalyst Activity ◽  
Advanced Oxidation ◽  
Oxidation Processes ◽  
Operating Variables ◽  
Radiation Sources ◽  
Radiation Processes ◽  
Main Operating

The use of graphene-based materials as catalysts in both ozone and ozone/radiation processes is creating interest among researchers devoted to the study of advanced oxidation processes (AOPs) for the degradation of organic pollutants in water. In this review, detailed explanations of catalytic and photocatalytic ozonation processes mediated by graphene-based materials are presented, focusing on aspects related to the preparation and characterization of catalysts, the nature of the water pollutants treated, the type of reactors and radiation sources applied, the influence of the main operating variables, catalyst activity and stability, and kinetics and mechanisms.

Catalytic Ozonation for the Degradation of p-Chloronitrobenzene in Aqueous Solution by Pumice

2011 ◽  
Vol 239-242 ◽  
pp. 1123-1128
Author(s):  
Lei Yuan ◽  
Zhong Lin Chen ◽  
Yue Liu ◽  
Yu Liu
Keyword(s):  
Aqueous Solution ◽  
Hydroxyl Radical ◽  
Reaction Temperature ◽  
Significant Contribution ◽  
Positive Influence ◽  
Catalytic Ozonation ◽  
Degradation Efficiency ◽  
Utilization Efficiency ◽  
Operating Variables ◽  
Main Operating

Catalytic ozonation of p-Chloronitrobenzene (pCNB) in aqueous solution has been carried out where pumice have been used as the catalysts. The presences of the catalysts significantly improve the degradation efficiency of pCNB and the utilization efficiency of ozone. The adsorption of pCNB is too small to make a significant contribution to the degradation of pCNB in either of the processes of catalytic ozonation by pumice. Addition of t-BuOH causes the obvious decrease of degradation efficiency, suggesting that degradation of pCNB follows the mechanism of hydroxyl radical (OH) oxidation. Some of the main operating variables like dosage of catalyst and reaction temperature exert a positive influence on the degradation efficiency of pCNB.

Reduction of Acquisition Time for RIL, SDL, and LADA

2007 ◽  
Author(s):  
Arjan Mels ◽  
Frank Zachariasse
Keyword(s):  
Background Noise ◽  
Signal Strength ◽  
Acquisition Time ◽  
Optimal Conditions ◽  
Signal Collection ◽  
Defect Localization ◽  
Model Equations ◽  
Set Up ◽  
Main Operating ◽  
Quantitative Tool

Abstract Although RIL, SDL and LADA are slightly different, the main operating principle is the same and the theory for defect localization presented in this paper is applicable to all three methods. Throughout this paper the authors refer to LADA, as all experimental results in this paper were obtained with a 1064nm laser on defect free circuits. This paper first defines mathematically what 'signal strength' actually means in LADA and then demonstrates a statistical model of the LADA situation that explains the optimal conditions for signal collection and the parameters involved. The model is tested against experimental data and is also used to optimise the acquisition time. Through this model, equations were derived for the acquisition time needed to discern a LADA response from the background noise. The model offers a quantitative tool to estimate the feasibility of a given LADA measurement and a guide to optimising the required experimental set-up.

Cake Formation in Cross-Flow Microfiltration Systems

1992 ◽  
Vol 25 (10) ◽  
pp. 149-162 ◽  
Author(s):  
V. L. Pillay ◽  
C. A. Buckley
Keyword(s):  
Cross Flow ◽  
Operating Conditions ◽  
Waste Waters ◽  
Domestic Waste ◽  
Time Curve ◽  
Good Correspondence ◽  
Operating Variables ◽  
Start Up ◽  
Turbulent Flow Regime ◽  
Cake Formation

Cross-flow microfiltration (CFMF) has potentially wide application in the processing of industrial and domestic waste waters. Optimum design and operation of CFMF systems necessitates a knowledge of the characteristic system behaviour, and an understanding of the mechanisms governing this behaviour. This paper is a contribution towards the elucidation and understanding of the behaviour of a woven fibre CFMF operated in the turbulent flow regime. The characteristic flux-time curve and effects of operating variables on flux are presented for a limestone suspension cross-flow filtered in a 25 mm woven fibre tube. The phenomena contributing to the shape of the flux-time curve are discussed. A model of the mechanisms governing cake growth and limit is presented. Predicted steady-state fluxes show a notably good correspondence with experimentally measured values. It is also found that the flux may not be uniquely defined by the operating conditions, but may also be a function of the operating path taken to reach the operating point. This is of significance in the start-up and operation of CFMF units.

Sign in / Sign up

Export Citation Format

Share Document