Dear Miss Neda Aizmi,

Humbly stated that thanks first of all I am highly thankful for the reply.

I have used that UDF for my Radiation Model in DO modeling for my water disinfection using UV light.

I have a good understanding of that UDF and all Radiation modeling approaches (MSSS, UVCalc3D, LSI, RAD-LSI, View Factor, DO) by the date in research.

Madam, I want to elaborate my answer more.

In CFD modeling there are three sub modeling under water disinfection or AOP i.e. (Flow modeling, Fluence rate modeling, and kinetic modeling). I can hand well both flow modeling (turbulence etc.) and radiation modeling. But I am struggling with kinetic modeling i.e. relating with chemical engineering. My major is mechanical engineering.

Now I explain more about the Kinetic modelling. This I can understand by date from the literature survey and published articles. Your recommendations and suggestions will be guiding steps for me. Here is my week part of modeling. I am not good at it.

In Fluent in order to perform the Kinetic modeling we have to use species model. Right??? . I am confused which would be the better modeling approach for AOP??

How we can do it?

I have read following articles (1-4)

(1) Crittenden, J. C.;Hu, S.;Hand, D. W.;Green, S. A. A Kinetic Model for H2o2/Uv Process in a Completely Mixed Batch Reactor. Water Res. 1999,33, 2315-2328.

(2) Moghaddami, M.;Raisee, M. Performance and Energy Consumption Analysis of Uv-H2o2 Photoreactors Using Computational Fluid Dynamics. Momentum,10, 1.

(3) Moghaddami, M.;Raisee, M.;Jalali, A. Development and Evaluation of One-Dimensional Model for Annular Uv-H2o2 Photoreactors. International Journal of Environmental Science and Development 2012,3, 382-386.

(4) Santoro, D.;Raisee, M.;Moghaddami, M.;Ducoste, J.;Sasges, M.;Liberti, L.;Notarnicola, M. Modeling Hydroxyl Radical Distribution and Trialkyl Phosphates Oxidation in Uv− H2o2 Photoreactors Using Computational Fluid Dynamics. Environmental science & technology 2010,44, 6233-6241.

In these articles If we go through the Kinetic modeling they have well explained about kinetic modeling especially reference [4] page 6234 in kinetic modeling section there are lines as under

"The kinetic model was incorporated into CFD using numerical subroutines to prescribe the net rate of generation, Ri, for each chemical species considered (eqs1-6).”

I am struggling with this ???

If you can guide me about this.

I would be obliged to you for help and guidance.

With profound regards

Tipu Sultan