UV FLUENCE RATE EVALUATION IN A UV SYSTEM: SIMULATING THE IMPACT OF OPERATING AND DESIGN PARAMETERS

摘要

The flow field and the intensity field collectively dictate the dose distribution delivered by a UVrnsystem. Estimate of the dose distribution represent a key output from the modeling tool developedrnin this research.rnAs a first component of this modeling work, a modeling tool has been developed for the simulationrnof the radiation intensity field in the reactor. It is based on the LSI method. It allows the rapidrnsimulation of fluence rate distribution field in different configurations and the analysis of design andrnoperation parameters sensitivity. Uncertainties exist in this model; however it is not expected tornprovide an absolute value of the fluence rate field, but rather to provide a sound basis forrnperformance evaluation and comparison.rnPractically, the model consists in a user-friendly Windows interface developed with Visual Basic.rnThe results are expressed in terms of fluence rate field within a section perpendicular to the lamps.rnExamples of calculations made for different reactor geometries are presented in this paper, eitherrnsingle lamp or multi-lamp systems. The main advantage of this tool is its capability to simulate thernfluence rate distribution in most of the various existing UV reactor lamp configurations.rnEven though the experimental validation of UV fluence rate could not be performed, the predictionsrnof the complete model combining UV fluence rate simulations with Computational Fluid Dynamicsrnshowed a satisfactory agreement with experimental bioassay. The model has been used to design arnfull-scale prototype. Details are given in the paper by Do-Quang et al (same session of thernconference).