Wave model for longitudinal dispersion: Application to the laminar‐flow tubular reactor
The wave model for longitudinal dispersion, published elsewhere as an alternative to the commonly used dispersed plug-flow model, is applied to the classic case of the laminar-flow tubular reactor. The results are compared in a wide range of situations to predictions by the dispersed plug-flow model as well as to exact numerical calculations with the 2-D model of the reactor and to other available methods. In many practical cases, the solutions of the wave model agree closely with the exact data. The wave model has a much wider region of validity than the dispersed plug-flow model, has a distinct physical background, and is easier to use for reactor calculations. This provides additional support to the theory developed elsewhere. The properties and the applicability of the wave model to situations with rapidly changing concentration fields are discussed. Constraints to be satisfied are established to use the new theory with confidence for arbitrary initial and boundary conditions.
Three‐Phase Trickle‐Bed Reactors
This chapter reviews the art and science involved in understanding the multiscale multiphase phenomena that affect the performance of trickle bed reactors. Their application areas, the traditional approach to their design and scaleup, and some commonly encountered problems in practice are discussed. The foundations for rational scaleup are introduced. The recent attempts to develop a multiscale science-based approach to scale up and design of these reactors is summarized at the end. 
 
 
 
The article contains sections titled: 
 
1. Introduction 
2. Design 
2.1. Flow Regimes 
2.2. Flow Distribution 
2.3. Pressure Drop 
2.4. Liquid Holdup 
2.5. Catalyst Wetting and Liquid–Solid Contacting 
2.6. Residence Time Distributions 
2.7. Heat Transfer and Thermal Stability 
3. Modeling and Analysis 
3.1. Reactor Models 
3.2. Hydrodynamic and Computational Fluid Dynamic Models 
3.3. CFD Models of Trickle Beds 
4. Trickle-bed Reactor Scaleup 
5. Reactor Troubleshooting 
6. Acknowledgment 
  References 
 
 
 
 
Keywords: 
 
Trickle bed reactor; 
multiphase reactors; 
scaleup
Study on workspace analysis and simulation of 6-DOF painting robot based on monte-carlo method
Comparing recent kinds of methods working on robot workspace when we design to calculate the workspace of 6R painting robot,we bring Monte-Carlo method to analysis the workspace according to the actual working condition. With robot Tool Center Point(TCP) position aggregate via the solution of forward kinetic equation,Monte-Carlo method analysis and simulate painting robot workspace efficiently.