A student working for HSRC at LSU developed a web-based unsteady-state fate and transport model for engineers to use in cap design.

View model

All professional chemical engineers and chemical engineering students should have all run into the UNIFAC method for the calculation of liquid activity coefficients. Developed in 1975 by Fredenslund, Jones and Prausnitz (AIChE J., 21, pp 1086), it is one of the best methods in estimating activity coefficients that has been established to date.

However, those who are familiar with the method will also know that it is quite a lengthy procedure unsuitable for situations where a quick and simple calculation is required. To address make the UNIFAC method easily accessable for quick calculations without need of large commercial packages, the UNIFAC Activity Coefficient Calculator was developed. The calculator is a 32-bit Windows 95 or Windows NT application that applies a user-friendly interface to the UNIFAC method. The system's chemical species are chosen from pull-down lists. The chemical component database is fully customizable, and allows for the creation and editing of species using the UNIFAC subgroup definitions.

Download the calculator here

Bruce Choy and Danny Reible's book, Diffusion Models of Environmental Transport, (CRC-Lewis Publishers, Boca Raton ISBN: 1-56670-414-6) solves a variety of diffusion equations. You can download the following three in mathcad spreadsheet format:

1-layer system
2-layer system
3-layer system

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