The Effect of Inner Walls Reflection on Microorganisms Inactivation in Water Ultraviolet Reactor using computational fluid dynamics

Document Type : Research Article

Authors

1 Tarbiat modarres university

2 tarbiat modares university

Abstract

The inner walls reflection of ultraviolet radiation is one of the effective components of the ultraviolet reactor efficiency. In this study, the effect of inner walls reflection of the reactor on the performance of the multi-lamp ultraviolet reactor has been evaluated using ultraviolet dose distribution and log inactivation values of MS2 and Bacillus subtilis microorganisms. The simulation of the flow field is performed using the SST k-ω model and the discrete ordinates model for radiation. The wall reflectivity is in the range of zero (no reflection) to 100 (ideal reflection) percent. In this range of reflections, for the reactor walls with aluminum cover, the reflectivity of 80.5% and 26.1% for the steel wall and ultraviolet transmittance of 87.7% and 78.5% were calculated. For ultraviolet transmittance of 78.5%, the received dose and log inactivation change with increasing reflectivity were very low but for ultraviolet transmittance of 87.7%, there is a tangible increase in these values and the results variation trend for two different flow rate was similar in ultraviolet transmittance of 78.5%. The performance of the reactor was investigated in two different lamp powers and ultraviolet transmittance of 78.5%, which is related to the higher power, the reflectivity effect has become more apparent.

Keywords

Main Subjects

References

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Amirkabir Journal of Mechanical Engineering
Volume 53, Issue 1 (Special Issue)
April 2021
Pages 375-392

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