Can we use methane-air chemical mechanism, which includes H2 oxidation mechanism as a submechanism, for a H2 combustion simulation with CFD?

Can we use methane-air chemical mechanism, which includes H2 oxidation mechanism as a submechanism, for a pure H2 combustion simulation or H2 enriched methane combustion simulation with CFD? Do...

10 November 2018 6,394 17 View

Is the reaction rate constant, k(T), of a chemical reaction affected by the kind of a third inert species, under the constant temperature condition?

Is the reaction rate constant, k(T), of a molecular chemical reaction affected by the kind of a third inert species (CO2 or N2 for example) under the constant temperature condition ? The reaction...

10 November 2018 1,726 19 View

Why does the mixture fraction combustion model overpredicts the outlet temperature in a natural gas boiler, according to the experimental datas?

I am simulating natural gas combustion in ANSYS Fluent. If i use the mixture fraction combustion model, the outlet temperature of the boiler is overpredicted according to the experimental datas....

06 July 2018 2,618 4 View

I am simulating methane - air combustion on Ansys Fluent. I use DO radiation model. Radiation residual diverges?

I am simulating methane - air combustion on Ansys Fluent. I use DO radiation model. For the first 700 iterations, the solution continuously converges. But later, the radiation residual suddenly...

31 December 2017 6,869 6 View

I am simulating methane - air combustion on Ansys Fluent. I use DO radiation model. I got all the residuals converged except radiation residual?

I am simulating methane - air combustion on Ansys Fluent. I use DO radiation model. I got all the residuals converged except radiation residual. The results look reasonable. The total heat...

11 December 2017 3,685 3 View

I am looking for a skeletal methane combustion mechanism in chemkin format, which has 17 species and 25 reactions. Where can i get it?

I am looking for a skeletal methane combustion mechanism in chemkin format, which has 17 species and 25 reactions. I have searched through many web sites but i can't get it. It is propably called...

10 November 2017 5,060 7 View

On your experience, what is the most preferable radiation heat transfer model for a combusting medium in Ansys Fluent?

On your experience, what is the most preferable radiation heat transfer model for a combusting medium (e.g. natural gas-air) in Ansys Fluent?

10 November 2017 2,888 3 View

Solution is converged for my cold flow analysis (methane-air) on Fluent, but the results look nonphysical ?

I'm simulating a cold flow analysis (methane-air) on fluent, using species transport model. The model has around 5 millions meshes with tetrahedrons and swept bodies. I use "realizable k-epsilon"...

08 September 2017 7,693 6 View

Why is a turbulent flow always inherently unsteady,even if the all conditions in the flow system are kept constant?What is the physical reason for it?

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03 April 2017 770 1 View

What is the difference between thermodiffusion coefficient DT and thermodiffusion coefficient for a particular species DT,i?

10 November 2016 3,142 0 View

what is the simplest definition of ion exchange capacity

What this unit identifies for the ion exchange capacity ca. 0.92 meq. g-1. I am a newcomer in the membrane area. I just started. I highly appreciate your help

08 May 2021 0 0 View

what is the simplest definition of ion exchange capacity

What this unit identifies for the ion exchange capacity ca. 0.92 meq. g-1. I am a newcomer in the membrane area. I just started. I highly appreciate your help

08 May 2021 0 0 View

How the parameters (such as Mw, Chemical bonds, polymer bland and so on) affect the mechanic property of polymer (such as storage, loss modulus) ?

Anyone can recommend any books on such topics? Thanks in advance.

02 March 2021 8,457 2 View

Why almost every element would be metallized in sufficiently high pressure and low temperature?

(This statement is from wikipedia, BTW). What is so special about metallic bond that is limiting high-P low-T state of a matter (as long as individual atoms exist, not white dwarf of neutron star...

02 March 2021 3,309 2 View

How Relativistic effects is one reason for lanthanide contraction?

The Lanthanide contraction which is the decrease in ionic radii of the elements in the lanthanide series from atomic number 57, lanthanum, to 71, lutetium, is due to poor shielding of the 4f...

01 March 2021 2,272 4 View

Ester cleavage conditions?

Hi all, I need to cleave the ester in Ethyl 2-amino-1H-imidazole-5-carboxylate to make the carboxylic acid and retrieve the product from solution to use in downstream applications of linking to...

01 March 2021 8,766 3 View

How Can I bring as much common elements in steel as possible to calculate stable phase(s) in OpenCalphad?

As I was tweaking step-by-step OpenCalphad6 Macros step1.ocm involving phase and thermal property calculation of a High-speed steel, I could not incorporate more than 6 elements in the steel...

01 March 2021 8,840 1 View

How could I process data in RCT to include it in meta-analysis?

I'm in the process of doing a meta-analysis and have encountered some problems with the RCT data. One of my outcom is muscle strength. In one study, I have three different measurements of muscle...

25 February 2021 7,603 3 View

What is the error of the Txy diagram?

Hi, I know the attached Txy diagram has an error but can't figure it out. Could you please look at the diagrams and explain it to me?

23 February 2021 4,239 1 View

I am looking for a simple software program to model 3D chemical bonds. The purpose is to generate high-quality graphical abstracts. Any suggestion?

Hello everyone: I am looking for a simple software program to model chemical bonds. The purpose is to generate a high-quality graphical abstract for a top leading journal in the field of...

23 February 2021 8,012 3 View