CFD simulation as a tool for evaluation and optimization of uv reactor decontamination process
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The document discusses the use of computational fluid dynamics (CFD) as a tool for evaluating and optimizing UV decontamination processes in various applications, including water treatment. It highlights the capability of CFD to analyze fluid flow and UV radiation fields, providing insights into pressure losses and dose distributions for microbial organisms. The model enables detailed assessments of unit performance and can identify causes of dose variation, aiding in the operational efficiency of UV reactors.
![Example geometry
Computational Fluid Dynamics (CFD) is an efficient and valuable tool for
evaluation and optimization of UV decontamination units. UV reactors are
used in a variety of fields, such as decontamination of drinking water,
industrial processes, ballast water and wastewater treatment. CFD can
help map the fluid flow and UV radiation field of complex geometries, and
provide detailed insight into the path and dose of microbial organisms.
Computational Mesh
Flow field [m/s]
Radiation field [W/m2]
Distribution of dosesParticles coloured by dose [J/m2]
Isolated low-dose particle
tracks [J/m2]
The simulation initially solves the flow field, and accounts for turbulent
dispersion. Post-processing of the flow field provides valuable information
about pressure losses, and highlights ill-defined flow patterns, such as flow
separation and recirculation zones. The model also simulates the UV
radiation field and can be adjusted to accurately capture the influence of
wall emissivity, diffuse reflection, and Ultraviolet Transmittance (UVT).
The microbial are simulated as discrete solid particles, and the absorbed
dose is calculated as a function of retention time in the radiation field and
the local radiation intensity. Applying a sufficiently high number of
particles supplies the user with a statistical analysis regarding mean-,
maximum-, minimum-, and standard deviation of dose. With the use of a
log-inactivation curve of the relevant microbial, the results can also
account for RED (Reduction Equivalent Dose). This may then readily be
used for evaluating unit performance and comparisons.
Through post-processing it is possible to isolated single particles, which
may be used to pinpoint the root cause of potential dose variation,
supplying additional highly valuable data regarding the operation of the UV-
reactor.
Gasværksvej 26, DK 9000 Aalborg www.R-R-Consult.com www.LinkedIn.com/company/R&R-consult Info@R-R-consult.com
CFD simulation as a tool for evaluation and optimization of UV-reactor
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CFD simulation as a tool for evaluation and optimization of uv reactor decontamination process
- 1. Gasværksvej 26, DK 9000 Aalborg www.R-R-Consult.com www.LinkedIn.com/company/R&R-consult Info@R-R-consult.com CFD simulation as a tool for evaluation and optimization of UV-reactor decontamination process
- 2. Example geometry Computational Fluid Dynamics (CFD) is an efficient and valuable tool for evaluation and optimization of UV decontamination units. UV reactors are used in a variety of fields, such as decontamination of drinking water, industrial processes, ballast water and wastewater treatment. CFD can help map the fluid flow and UV radiation field of complex geometries, and provide detailed insight into the path and dose of microbial organisms. Computational Mesh Flow field [m/s] Radiation field [W/m2] Distribution of dosesParticles coloured by dose [J/m2] Isolated low-dose particle tracks [J/m2] The simulation initially solves the flow field, and accounts for turbulent dispersion. Post-processing of the flow field provides valuable information about pressure losses, and highlights ill-defined flow patterns, such as flow separation and recirculation zones. The model also simulates the UV radiation field and can be adjusted to accurately capture the influence of wall emissivity, diffuse reflection, and Ultraviolet Transmittance (UVT). The microbial are simulated as discrete solid particles, and the absorbed dose is calculated as a function of retention time in the radiation field and the local radiation intensity. Applying a sufficiently high number of particles supplies the user with a statistical analysis regarding mean-, maximum-, minimum-, and standard deviation of dose. With the use of a log-inactivation curve of the relevant microbial, the results can also account for RED (Reduction Equivalent Dose). This may then readily be used for evaluating unit performance and comparisons. Through post-processing it is possible to isolated single particles, which may be used to pinpoint the root cause of potential dose variation, supplying additional highly valuable data regarding the operation of the UV- reactor. Gasværksvej 26, DK 9000 Aalborg www.R-R-Consult.com www.LinkedIn.com/company/R&R-consult Info@R-R-consult.com CFD simulation as a tool for evaluation and optimization of UV-reactor decontamination process