26 Questions 5 Answers 0 Followers
Questions related from Ahmad Alsuwaidi
I am working on reduced-order modeling of CFD simulation data. I performed POD on temperature fields (structured grid) and extracted the POD coefficients. I also tried an Autoencoder approach to...
10 August 2025 4,555 0 View
Hi all, In my CFD study of a fluidized bed reactor (using ANSYS Fluent), I observed that the system reaches a pseudo-steady state around t = 350s. For a parametric study, I want to evaluate the...
04 July 2025 8,086 1 View
Hello, Anyone wrote down UDF using Gas-Solid Hetrogenous kinetics such as Jander or Glinsting ? should I simply use the parametereters obtained from the models, or should I rewrite the rate...
20 March 2025 6,937 0 View
Recently I used this equation, that I found from http://chemphys.space/thinks/ on Modelling Coke oxidation Kinetics. I got some interesting results, but I am not sure if my method is reliable. A...
17 January 2025 2,352 2 View
I am currently working on modeling FCC catalyst regeneration and have come across a point of uncertainty that I hope you can assist me with. In my previous models, I have utilized lumped kinetics...
31 July 2024 6,744 0 View
Hi Everyone, I am using a UDF file that contains coke oxidation of spent catalyst. I was wondering if there is any way to use the built in Function in Ansys instead. Furthermore, coke oxidation...
24 May 2024 4,522 0 View
Hello, I was wondering if any modelled 2 stage FCC regenerator and happy to share the model to me.
03 May 2024 526 0 View
Hello Everyone, I am looking for 2 stage regenerator configuration. I am want to perform some CFD modelling on this model. Ahmad
27 April 2024 9,619 0 View
In the multiple surface reaction, both rate constant and dissuion constant takes place. Is it possible to model this heterogeneous reaction without using UDF in fluent. I was wondering if there...
03 April 2024 1,994 0 View
I want to learn how to create UDF file for CFDs Fluent. I don't know how and what is the difference of specifying reaction using UDF. I was recomended to build the UDF based on multiple surface...
29 March 2024 6,959 0 View
Hello Everyone, I am facing a challenge of determining reliable kinetics. I know ICTAC recommended multiple heating to perform to perform reliable results. However, I am conducting single...
26 March 2024 3,915 1 View
hello Everyone, if I want to study, coal combustion in different atmospheres for example in O2/N2 and O2/CO2. I obtain the kinetics of both atmospheres using Hetrogenous models. ( Shrinking core...
14 March 2024 5,936 1 View
Hey Everyone I am looking model free Kinetics calculation sample or tutorial. Also I am looking NLN ( advanced Model free method ) Tutorial ?
13 March 2024 7,139 3 View
Hello, I am desinging a reactor in CFD, and I was wondering the possibility to couple DAEM model, Model Fitting Models, Isoconversional Models, and advanced Isoconversional Model into my...
13 March 2024 287 0 View
Hey Everyone, I am looking for Sample Kinetic Analysis files for some the following methods. Isoconversio Mod DAEM advanced Isoconversional Models (NLN)
12 March 2024 9,464 0 View
Hello, I was wondering why DAEM model is not used widely in Coke oxidation kinetics. I found out most DAEM models been applied to coal gasification. I am considering adopting the DAEM model for...
12 March 2024 7,544 0 View
Hello Everyone, I have couple questions about Kinetic analysis: 1- I performed linear fitting of non-isothermal reaction by coats-redfern and I obtained the kinetic parameters, most of the...
12 March 2024 5,943 0 View
I performing combustion in two different atmosphere I want to observe the affect of replacing N2 with CO2 in combustion in solid fuels I am dividing my research into three parts: 1- Kinetic...
10 March 2024 3,975 2 View
Hello Everyone, I have some queries about if its possible using heterogeneous models reactions to model particle Temperature profile in CFD ? I performed Kinetic analysis of my reaction (coke...
07 March 2024 7,022 1 View
Hello, what is the best way to find partial pressure order. I am proposing the following and correct me if I am wrong ? Obtain Activation Energy and pre-exponential factor from ( Coat-redfern)...
07 March 2024 1,116 2 View
I was infomed by my colleagues that conducting TGA analysis is not the best option for my material ( spent catalyst with 1% coke ). They informed me to conduct instead TPO and convert the results...
05 March 2024 4,868 1 View
I was wondering is using Coat-Redfern method is reliable for single heating rate. I calculated the activation energies from slope of 5 different partial pressure results and wondering how I can...
05 March 2024 5,412 3 View
Hello Everyone, I know there are many modelling techniques. We have Coats-redfern were used mainly for single heating ( Model Fitting Technique) Also we have DAEM modelling which is consider...
01 January 1970 5,163 0 View
Is MDPI Processes a reliable journal for early-career researchers, particularly in terms of peer-review quality and scientific impact? I am considering submitting a manuscript to the MDPI journal...
01 January 1970 3,657 1 View
Hey Everyone, 1) I have a question for the community is publishing in Frontiers chemistry is consider bad, many people is saying this while I found out the journal to be Q1 according...
01 January 1970 9,100 1 View
I am considering submitting a manuscript to MDPI Catalysts as part of my PhD thesis work. I am aware that MDPI as a publisher has received some criticism regarding its open-access model, but I...
01 January 1970 1,882 2 View
