Chemical Reaction in continuous flow
 

Dear users,

I am actually working on two case of chemical reaction inside different type of reactor.

One is a tubular reactor with baffles . I have the 3D model and already did some simulation with a UDF function giving oscillation at the inlet of the flow. I got good flow patterns and movies so I am happy with it. The thing is I would like to had a chemical reaction in the flow to see where the product start to appear in the reactor. I already tried some reactions inside the reactor with ansys fluent and have strange results. The reactant are still here and doesn’t react while I have already at the beginning of the flow some of the product which is strange. Maybe my parameters are not good.
That why I am writing this post to see if there is not a UDF function or some parameters I could put to see the product appearing.

On this picture bf46 is the product:

https://photos-5.dropbox.com/t/2/AAB...60&size_mode=2

Here the oscillation:

https://photos-5.dropbox.com/t/2/AAB...60&size_mode=2

The UDF function for the oscillations:

/************************************************** ********************
unsteadfffy.c
UDF for specifying a transient velocity profile boundary condition
************************************************** *********************/

#include "udf.h"

DEFINE_PROFILE(unsteady_velocity, thread, position)
{
face_t f;
real t = CURRENT_TIME;

begin_f_loop(f, thread)
{
F_PROFILE(f, thread, position) = 0.0027 + 0.0025*12.566*cos(12.566*t);
}
end_f_loop(f, thread)
}

The reaction rate :

https://photos-6.dropbox.com/t/2/AAC...60&size_mode=2

In another hand I made some simulations on segmented flow. It is a multiphase VOF. One of the fluid is the solution and the other is the carrier fluid. And I would like to apply the same thing as above to the solution (the solution doesn’t react with the carrier fluid) to see the nucleation, growth of the product inside the slugs.

https://photos-3.dropbox.com/t/2/AAC...60&size_mode=2


Thanks in advance for your input, :)

Kind regards,

Piba