[sache]

Hi all,

I am working on sound based thermoacoustic cooling. It contains just a duct, speaker at one end and stack in between with other end closed.
I have done transient simulation using fluent with oscillatory pressure inlet condition. K-E, ideal gas, PISO and other required conditions.
Idealy one end of the stack should get cooled while other become worm.
while in my case getting the temperature difference but both end temperatures are more than atmospheric.
i dont know what is wrong with the simulation, please guide me.

[adi.ptb]

thermoacoustic cooler consist of a resonator tube ,a cold heat exchanger(chx),hot heat exchanger(hhx),and a regenerator(stack),you can model the thermoacoustic cooler either with porous formulation and body forces or with physical flow channels,if you use porous formulation you need to choose the viscous resistance coe and inertial resistance carefully and also the materials(heat exchangers usually copper and stack are made of stainless steel),another important thing is the oscillating boundary(loud speaker ) the frequency must be low(20hz or so) and the amplitude of the pressure must be high in order to see the thermoacoustic cooling,in modeling base upon physical flow channel u should introduce a temperature gradient along the stacks to create a thermoacoustic effect,hope this helps

[sache]

Thank u Adi.ptb for this reply.
Currently I have set 350 hz freq. And 6000 pa amplitude.

What u r saying is correct. Is it necessary to set temp. gradient along stack. Obviously solution will get easily converged. But even if we don't sent code will calculate itself isn't?

[adi.ptb]

sorry i didnt catch that,would you mind explain further?