[Tleja]

Hi All!

I'm not familiar in heat transfer field. I'm studying fluidized bed reactor with transient study.

In my system, solid particle was patched at the bottom of reactor. Then, i continuously fed gas and solid with 343K temperature. I also initialized this system with 375K.

After starting calculation, i found that total heat flux of gas and solid at feed inlet are negative value. As my understanding, total heat flux should be equal to mass flow rate*heat capacity*(T in-T ref) which is certainly positive value. i also checked that mass flow rate of gas and solid at inlet are positive value.

I don't know why total heat flux is negative value at inlet.

Please anyone advice me to solve this problem.
Thank you so much.

Best regard
Tleja