Granular Bed Filter Development Program. Theoretical Analysis of Granular Bed Filtration Principles and Performance Prediction.

摘要

The purpose of theoretical investigations has been to identify and define key relationships to be incorporated in a computerized model of GBF performance. Successful implementation and development of such an analytical tool was expected to yield a number of potential applications and benefits:the understanding of physical principles and mechanisms contributing to observed filter performance and recognition of those mechanisms that have negligible influence;interaction between the model results and an ongoing experimental program to build confidence and improve accuracy in the former,and provide useful direction to the latter;guidance for empirical correlations of experimental data in the choice of promising forms,etc.,by reference to available computer solutions;model extension to predict performance for new designs,conditions,and applications;and use of the model to search for optimal operating conditions,and to define sensitivities. In addition,the traditional justification for simulators--to generate solutions that simultaneously satisfy a large number of interacting relationships in a consistent,accurate,and repeatable manner--applies with special force to the GBF situation. This task paralleled the cold-flow filter model design,installation and testing effort. Early literature search and consultant services yielded equation development and identification of major filtration coefficients which,when applied to mathematical models and computer programming,provided filter performance solutions for all parameters under consideration. The correlation of these theoretical results with data from on-going experiments permitted an upgrading of the model,thus providing a firm data base with which to design future hot-flow filters. (ERA citation 04:004958)