The question comes up with a mixture of aluminium powder and steam is to be modelled thermodynamically. So that I assume based on the thermal conduction of aluminium some of the heat is transferred to aluminium powder from steam. But to express the overall enthalpy and energy flow of the stream. How do we consider solid phases in a flow of solid-gas mixture?
My first idea was to take the specific heat of the aluminium powder at corresponding temperature to calculate the heat transferred, but I got a little bit confused since it doesn't so true to add the amount of heat carried by aluminium to the enthalpy of the steam. As follows:
Q= hsteam + mAL . cp . Delta T (or directly T ?)
as we do the energy balance of a system component, let's say a heat exchanger.
I would really appreciate your advice.
All the best
Hüseyin
I would recommend to analyze the considered system and it bounaries including all incoming flows (energy/enthalpy and substances) first. Then write the energy and mass balance. Then you will see that you forgot the steam flow and your enthalpy term does not show any influence of heating of the steam, so you have also here to use an enthalpy difference. Finally don't forget that the steam flow and the Al flow must have the same outlet temperature. It is easier to understand if you make first a graphic of your problem before you write your equations. Good success.
Hello Huseyin,
if the energy is transferred from the steam to the aluminium powder, then the internal energy U of the steam is reduced (h = U +pV). This means Q is constant (if you have adiabatic conditions). If you have isotherm conditions, then the energy loss is balanced and your formulaes are OK.
With Regards
R. Mitdank
Before you get confused look in thermodynamic textbook about energy and mass balances (open closed systems. Don't forget to check dimensions, you didn't obviously (msteam? rest see above).
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