Why the results when using wall thickness and when using shell conduction are different in ansys fluent?

Actually, I am running cfd simulation for a heat exchanger which has two fluids one hot and other one is cold fluid. there is a solid domain between them, which I removed and instead I have used...

01 March 2021 9,537 2 View

How much pressure we can reduce at the outlet to avoid Reverse Flow?

I am simulating Heat Exchanger. I have tried and tested all the methods to resolve this issue from the internet like refining mesh, improving skewness and orthogonal quality ,extending outlet to...

01 March 2021 6,985 3 View

Does anyone know to clarify these changes?

01 March 2021 1,290 2 View

What is recommended for solid domain in ANSYS FLUENT?

Should I mesh the solid domain ? or should I use wall thickness? or Shell conduction? for Heat Transfer between two fluids of a Heat Exchanger. what is recommended?

01 March 2021 9,785 3 View

Can Virtual Servers (remote dekstop manager) run heavy ANSYS Fluent CFD simulation ?

I have a virtual machine. My host Pc specs are not that good thats why i went for virtual servers. so basically my host pc has 8gb of ram with nvidia quadro k2200 4Gb DDR5 GPU ,processor intel...

01 March 2021 8,415 1 View

What is the difference between PBE and PBEsol functional?

Hello, I am a 3rd year chemistry student and I'm writing my project report on computational chemistry. does anyone know how PBEsol improves upon the PBE functional? Thanks in advance

19 February 2021 7,068 4 View

Can someone help me with this error that I am getting while estimating a VAR model in R?

I am using annual time series data to estimate a VAR model in R. However, when I run the command to find the optimal lag length, I get the following error: Fehler in VARselect(data, lag.max = 10,...

18 February 2021 9,647 3 View

How to avoid ATP degradation while performing ATP assay?

I am using the ATP Assay Kit (Colorimetric/Fluorometric) (ab83355) for measuring intracellular ATP from treated cell lines. Although my standards are wokring fine when using the fluorometric...

15 February 2021 3,746 4 View

In your experience what is the difference between G.652D and G.655D optical fiber. In field and in lab?

In our current era there is a big confusion about the usage of G.652 and G.655 optical fiber cable. Theoretically G.655 is much better than G.652 but the operator feel that G.652 is giving almost...

11 February 2021 4,006 8 View

How many dilutions are good enough for TCOD50 of SARS-CoV-2?

I started with 10e-1 till 10e-10. But when I searched for online calculator they mostly consider 5 dilutions. Is there a reason behind it or I should make less dilutions?

11 February 2021 5,839 3 View

Have you ever experiencing air vent trouble in fermentation process?

Dear all, My research group is currently working with a 12-litre fermenter. Somehow, if we do the fermentation for more than 20 hours, the process will be more prone to contamination. Our current...

23 February 2021 1,908 2 View

Can anyone please suggest where I can find a reference for ReaxFF parameters for PTFE(Teflon) suitable for use in LAMMPS?

Trying to simulate a ice-PTFE interaction and am unable to find a reference which actually lists out forcefield parameters for PTFE-PTFE interactions using ReaxFF or even other force fields like...

08 February 2021 9,373 2 View

Why is there no global interest in using alternatives to rebar?

Why is there no global interest in using alternatives to rebar? GFRP has many advantages such as 1-High strength. 2-Corrosion resistance 2-High Insulation. it is better than Steel Rebars?

24 January 2021 5,757 6 View

How to measure the hardness for PLA & PHAs polymers?

Hello, I am a bit confused on whether to follow ASTM D785 (Standard Test Method for Rockwell Hardness of Plastics and Electrical Insulating Materials) or ASTM D2240 (Standard Test Method for...

21 January 2021 7,487 4 View

How can i disable thermal insulation node for internal boundaries of sub domains?

Hello Researchers.. I am new to Comsol and using heat transfer in porous media and heat transfer in fluids physics interface. We know that in Comsol a default node Thermal Insulation is added when...

16 December 2020 9,531 1 View

Is it possible to measure surface area of the polymer film using BET analysis?

I need to measure the surface area of the polymer film (PTFE, PET, 50 um thickness) with micro/nano roughness on the surface (not porous). Is it possible through BET analysis? What is the best way...

20 August 2020 8,866 6 View

Are there any chances that the cable gets damaged while performing the Insulation resistance test?

Regarding Insulation Test on Cable

21 April 2020 4,938 5 View

Is it possible to coat PTFE on PP to decrease surface energy?

I would like to know about the coating possibilities of PTFE on PP or any other fluorinated polymer on PP to decrease surface energy. All suggestions are welcome.

27 March 2020 9,623 3 View

Are glass vials suitable for microwaving organic solvents such as Dicholoromethane? And, can DCM be microwaved at 100 deg C in a sealed tube?

I want to convert a carboxylic acid into Thio Acid using Lawesson's reagent. Based on the literature, this reaction requires a microwave reaction with Dichloromethane as an organic solvent, at 100...

27 February 2020 9,173 2 View

Which thermal insulation material?

Hello, we are looking for a good thermal insulation material (let's say k < 2 [W/mK]), with reasonable mechanical properties (especially regarding compression), and which can be operated at...

20 February 2020 7,694 8 View