ConvEx

Purpose of the program 

ConvEx package is the analog-free powerful tool for simulation of thermal explosion in reactive fluids when convection and diffusion are of significant importance.

The project-oriented User's interface visualizes structure of the project to be simulated, provides easy access to every project's component. It such a manner the interface guides you along all the steps of the problem solution.

The package consists of three autonomous modules - CE- FK, CE-DK, and CE-Pro. The access to these modules is provided by the ConvEx suite shell which makes use of the package more convenient and vivid.

CE- FK allows simulation of thermal explosion in pseudo-one-component liquid. Chemical reactions are described by formal kinetic models.

CE- DK provides simulation of thermal explosion in multi-component liquid. Chemical reactions are described by concentration-based descriptive kinetic models. CE-DK utilizes the simplified set of species properties. The simplified built-in database can be replenished by the User. The additive rules are applied for calculation of properties of multi-component mixtures

CE-Pro: simulation of thermal explosion in multi-component liquid. Chemical reactions are described by concentration-based descriptive kinetic models. This module is linked to Mixture software that allows calculation of the comprehensive set of properties of real mixtures.

Simulation modes

All these modules support three modes of simulation

• Runaway – simulation of thermal explosion development, estimate of induction period of an explosion
• Critical search - automated determination of critical temperature for the object of the defined geometry and size, and induction period.
• SADT - automated determination of the Self Accelerating Decomposition Temperature (SADT) in accordance with the United Nations Recommendations on Transport of Dangerous Goods

Critical search and SADT modes are based on the assumption of a well stirred tank. It allows getting fast preliminary estimates. More precise results can be obtained by applying runaway mode starting from these preliminary estimates.

Handling data

ConvEx is based on the project concept. A project unites all the data necessary for simulation – kinetic model, object description (geometry, size, boundary conditions), physical properties of a reacting substance and construction materials, type of simulation, parameters of numerical method.

Projects are stored in the internal database. Database consists of data volumes. Every data volume includes number of projects.

ConvEx provides direct access to the ForK and DesK data bases which allows easy import of kinetic models  created by using of ForK or DesK software.

Boundary conditions

ConvEx allows simulation of an object under boundary conditions of the first (temperature on the outer surface is defined), second (heat flux on the outer surface is defined, and third (heat exchange in accordance with Newtonian low) kind. Boundary conditions as tabular functions of time can be defined separately on every surface.

Viewing the results

Results of simulation are presented in graphical form as evolutional curves (temperatures, conversions or concentrations), in form of the Color Gradient view of temperature distribution during the simulation, in the 3-D plot, and as iso-lines for temperature and concentrations. The flow of liquid in a tank can be observed on the “velocity vector field” page.

CE-FK and DK support set of tanks or predefined geometry – shelled fully filled sphere, barrel and infinite horizontal cylinder.

CE-Pro allows simulation of thermal explosion of the same fully filled tanks. Important feature of this module is that it provides simulation of thermal explosion and accurate calculation of pressure rise of gas-vapor mixture in a partly filled vertical tank. CE-Pro requires the Mixture software to be installed.

Installation

ConvEx 2x and higher is compatible with Windows XP, 7, 8, 10.

ATTENTION!

​1. When installing ConvEx under Windows 7 and higher we strongly recommend to use the default path
    C:\Users\[username]\CISP\ConvEx

2. When installing new versions of TSS applications one can meet the problem with Anti-virus tools you use.
    Some of them may suspect that TSS programs are hazardous ones. Please don't worry. This may happen 
    due to new powerful protection system (provided by  the Enigma Protector - one  of the world  leaders in this
    area) which sometimes causes alarm because anty-virus tools cannot look  inside the protected code. As a
    result the approcation will be blocked.  To avoid such problem ask your IT service to exclude
    Users\[username]\CISP folder from virus  check.
    CISP guarantees that TSS is 100% clean, which means its applications do not contain any form
    of malware, including but not limited to: spyware, viruses, trojans and backdoor.
    

Requirements:

CPU: Intel Pentium 1200 MHz and faster
Memory: 512 MB
Disk space: 50 MB
CD-ROM: present
OS: MS Windows XP, 7, 8, 10.