Evaluation of alternative fluence rate distribution models (2004)

Research Article| September 01 2004 Evaluation of alternative fluence rate distribution models Dong Liu; Dong Liu 1Department of Civil, Construction, and Environmental Engineering, North Carolina State University, 208 Mann Hall CB 7908, Raleigh, NC 27695-7908, USA Search for other works by this author on: This Site PubMed Google Scholar Joel Ducoste; Joel Ducoste 1Department of Civil, Construction, and Environmental Engineering, North Carolina State University, 208 Mann Hall CB 7908, Raleigh, NC 27695-7908, USA E-mail: jducoste@eos.ncsu.edu Search for other works by this author on: This Site PubMed Google Scholar Shanshan Jin; Shanshan Jin 2Degremont North American Research & Development Center, 510 E. Jackson St, Richmond, VA 23219, USA Search for other works by this author on: This Site PubMed Google Scholar Karl Linden Karl Linden 3Department of Civil and Environmental Engineering, Duke University, Durham, NC 27708-0287, USA Search for other works by this author on: This Site PubMed Google Scholar Journal of Water Supply: Research and Technology-Aqua (2004) 53 (6): 391–408. https://doi.org/10.2166/aqua.2004.0031 Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Share Icon Share Twitter LinkedIn Tools Icon Tools Cite Icon Cite Permissions Search Site Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentAll JournalsThis Journal Search Advanced Search Citation Dong Liu, Joel Ducoste, Shanshan Jin, Karl Linden; Evaluation of alternative fluence rate distribution models. Journal of Water Supply: Research and Technology-Aqua 1 September 2004; 53 (6): 391–408. doi: https://doi.org/10.2166/aqua.2004.0031 Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex A detailed evaluation of several fluence rate distribution models was performed. These models included line source integration (LSI), multiple points source summation (MPSS), multiple segment source summation (MSSS), UVCalc3D, RAD-LSI, view factor and discrete ordinate (DO). As part of the evaluation, a complete MSSS model, which accounts for the quartz sleeve thickness when calculating the refraction angles, was developed. In addition, a simple attenuation factor was introduced to integrate the physics of reflection, refraction and absorption effects into the LSI model. As an alternative simple correction to the LSI, the RAD-LSI incorporates the RADIAL intensity model into the original LSI formulation. All models were compared with experimental measurements using spherical actinometers, which measure the fluence rate at specific points in space. Experimental measurements were performed in air and water. Experiments in water were performed at two different ultraviolet transmittance (UVTs) (77 and 88%). The results showed that models that neglected the effects of refraction deviated significantly from the experimental data. In addition, the MSSS approach or models that incorporated the MSSS concept were found to best match the experimentally measured fluence rate distribution. Moreover, little difference was found between the results of MSSS with quartz sleeve thickness and UVCalc3D, which does not model the quartz sleeve thickness in the refraction angle calculation but uses a factor to account for the effects of the quartz sleeve on the fluence rate. The attenuation factor combined with the LSI model was found to match the MSSS model predictions, while reducing the computational cost. disinfection, fluence rate, model, spherical actinometry, UV This content is only available as a PDF. © IWA Publishing 2004 You do not currently have access to this content.