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Author: Publisher: ISBN: Category : Languages : en Pages : 7
Book Description
The aim of the present work is to provide global insight on the turbulent mixing processes typically occurring in a rectangular perspex mixing module simulating a sector of an annular RQL gas turbine combustor, through an experimental investigation of non reacting multiple jet mixing with a confined swirling crossflow. The RQL (Rich burn - quick Quench - Lean burn) staged combustion concept has been proposed as one of the candidate technologies towards reducing NOx emissions in gas turbine combustion systems. Mean and fluctuating momentum and scalar field distributions, mixing rate and standard deviation were determined in a number of different test cases obtained by parametric variation of flow and geometric configuration conditions. The results clearly indicate the sensitivity of the attained mixing quality on the particular flow arrangement, the momentum flux ratio and the effect of swirl induced in the primary zone.
Author: Publisher: ISBN: Category : Languages : en Pages : 7
Book Description
The aim of the present work is to provide global insight on the turbulent mixing processes typically occurring in a rectangular perspex mixing module simulating a sector of an annular RQL gas turbine combustor, through an experimental investigation of non reacting multiple jet mixing with a confined swirling crossflow. The RQL (Rich burn - quick Quench - Lean burn) staged combustion concept has been proposed as one of the candidate technologies towards reducing NOx emissions in gas turbine combustion systems. Mean and fluctuating momentum and scalar field distributions, mixing rate and standard deviation were determined in a number of different test cases obtained by parametric variation of flow and geometric configuration conditions. The results clearly indicate the sensitivity of the attained mixing quality on the particular flow arrangement, the momentum flux ratio and the effect of swirl induced in the primary zone.
Author: Robert Brodkey Publisher: Elsevier ISBN: 0323154689 Category : Technology & Engineering Languages : en Pages : 352
Book Description
Turbulence in Mixing Operations: Theory and Application to Mixing and Reaction presents a summary of the current status of research on turbulent motion, mixing, and kinetics. Each chapter of this book discusses turbulence in the context of mixing and reaction in scalar fields. Chapters I and III discuss the classification of turbulent reacting systems and the different possibilities in this context. Chapter II reviews the properties of passive mixing. Chapter IV looks at turbulent mixing in chemically reactive flows. Chapter V uses different techniques to make parallel numerical calculations of both mixing and reaction. Finally, Chapter VI reviews turbulence and actual industrial mixing operations. This book will be of great value for chemical and industrial engineers, especially for those interested in turbulent and industrial mixing.
Author: S. Murthy Publisher: Springer Science & Business Media ISBN: 1461587387 Category : Science Languages : en Pages : 469
Book Description
Turbulence, mixing and the mutual interaction of turbulence and chemistry continue to remain perplexing and impregnable in the fron tiers of fluid mechanics. The past ten years have brought enormous advances in computers and computational techniques on the one hand and in measurements and data processing on the other. The impact of such capabilities has led to a revolution both in the understanding of the structure of turbulence as well as in the predictive methods for application in technology. The early ideas on turbulence being an array of complicated phenomena and having some form of reasonably strong coherent struc ture have become well substantiated in recent experimental work. We are still at the very beginning of understanding all of the aspects of such coherence and of the possibilities of incorporating such structure into the analytical models for even those cases where the thin shear layer approximation may be valid. Nevertheless a distinguished body of "eddy chasers" has come into existence. The structure of mixing layers which has been studied for some years in terms of correlations and spectral analysis is also getting better understood. Both probability concepts such as intermittency and conditional sampling as well as the concept of large scale structure and the associated strain seem to indicate possibilities of distinguishing and synthesizing 'engulfment' and molecular mixing.
Book Description
Mixing may be thought of as the operation by which a system evolves from one state of simplicity (initial segregation) to another state of simplicity (complete uniformity). Between these two extremes, complex patterns emerge and die. Questions naturally arise- how can the geometry of complex patterns be characterised, what is the time scale of the process, what structures are involved in the flow? This volume, comprising the proceedings of the NATO ASI on Mixing, attempts to address these questions from the approaches of geometry, kinetics and structure. The ASI which brought together diverse communities with a common interest in the problem of mixing, now provides us with a comprehensive work on the problem of mixing.
Author: Andrew Brown Publisher: ISBN: Category : Languages : en Pages : 0
Book Description
Mixing is a fundamental part of many processes in chemical engineering. In order for molecular processes to proceed there is an implicit requirement for molecular scale mixing. Many processes are so slow that they are effectively independent of mixing as mixing is fast relative to the process. However, for fast processes mixing can be the limiting step and for processes with competitive elements it can control product quality and distribution. Antisolvent crystallisation is one such process which is strongly influenced by mixing. The initial mixing controls the distribution of supersaturation which in turn controls the nucleation rate and hence many key parameters such a particle size distribution. In order to understand antisolvent crystallisation and how the initial mixing influences nucleation it is important to first understand the mixing process itself. In this thesis mixing was measured and quantified by utilising a mixing sensitive competitive reaction scheme with well understood and well defined kinetics. The reaction scheme that was chosen was the Bourne IV reaction scheme which has received considerable interest in the scientific literature as a means to quantify and characterise the mixing performance of rapid continuous mixers. The original scheme has some inherent limitations in terms of ranking mixers operating under the conditions commonly encountered in industrial applications; namely the 1:1 flow ratio and the lack of a difference in the physical properties of the streams. This original scheme has been extended in a systematic way to incorporate differences in the flow ratio and physical properties. The results have been analysed in conjunction with a model capable of allowing fair comparison between the flow ratios. Several continuous mixers of various sizes including an impinging jet mixer and a vortex mixer have been characterised over a variety of mixing conditions. The antisolvent precipitation of valine in a confined impinging jet mixer was explored and analysed in conjunction with the mixing characterisation data allowing depth to be added to the analysis of standard crystallisation experiments. It is demonstrated that the initial mixing (over the first second) controls many of the key parameters in antisolvent crystallisation which underlines the importance of designing and scaling the initial mixing process correctly. It is also demonstrated that this is true even when samples are subjected to additional shear over long timescales. The vortex mixer characterised here was utilised in an industrial scale pilot trial and the results contrasted with those obtained using an "off the shelf" cross mixer. This work underlines that controlling the initial mixing step has strong industrial relevance and is one of the single most important parameters in the process design of antisolvent crystallisation processes.
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Author: American Society of Mechanical Engineers. Winter Annual Meeting
Author: Robert Brodkey
Author: Guiren Wang
Author: Paul J. Waltrup
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Author: S. Murthy
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Author: H. Chaté
Author: Andrew Brown