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Radiative properties of gaseous species and soot
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Unexpected fluctuation in total emissivity before the temperature T=1000 K #12

Open ahsadeghi opened 5 years ago

ahsadeghi commented 5 years ago

Hi, The values for total emissivity have some unexpected fluctuations and bumps before the temperature 1000 K with the relative minimums at the temperatures where the experimental data were reported [Wakatsuki, 2005]. Does anyone know why it happens and where it is calculated or interpolated? Please see the attached figure for gas Heptane for total emissivity which is calculated by ((1-total_transmissivity)).

ahsadeghi commented 5 years ago

Hi @gforney, Could you help me?

rmcdermo commented 5 years ago

This may take us some time to look at. We do not run RADCAL off line very often. Please be patient.

rmcdermo commented 5 years ago

@drjfloyd can you take a look at this? Does stand alone RADCAL actually give a continuous function EMISSIVITY(T)? It is not clear to me where the blue line comes from versus where the black dots come from.

drjfloyd commented 5 years ago

ahsadeghi,

Where did the blue line and the black dots come from? Is the blue line FDS or are you running RADCAL? Can you attach the input you are using?

ahsadeghi commented 5 years ago

I run Radcal for different temperatures and then plot this (as I explained in the question topic).

ahsadeghi commented 5 years ago

Do you know how Radcal calculates SNB parameters at the temperatures other than the FTIR experiment temperatures? In which part of the code it is?

drjfloyd commented 5 years ago

None of the current development team were part of the development of RADCAL. The original RADCAL source and the theory manual for RADCAL can be found here: https://github.com/firemodels/radcal

If you ran RADCAL as a standalone code using the RADCAL namelist format can you attach the input file you used.