Problem in Axial turbine stage NonEquilibrium Calculation

bharath · April 13, 2016, 00:38

Hi to all
I am doing simulation for Axial turbine (Steam turbine) Last Stage Blade Non Equilibrium calculation using IAPWS table.

1)For Droplet Condensation, I used MUSIG approach for different size particle diameters (1µ to 20 µ). While doing post processing, I found that steam(liquid) temperature (Tl) is more than steam (Vapor) temperature (Tv). Tl > Tv

2) However when using small droplets model Steam (liquid) temperature is less than Steam (Vapor) temperature. Tl < Tv and I think this is right.

Why Tl > Tv in MUSIG approach? Could any body help me regarding this issue.
Thanks in advance

bharath · April 19, 2016, 00:15

Hi,

After further study I found the reason for this.

At first in both models Tl>Tv.(i.e) steam (liquid) temperature is greater than Steam (gas) temperature. Previously, I noted it wrong.

Steam (gas) is in super cooled state (otherwise metastable region) Tl is greater than the Tv. This is possible in meta stable regions and nucleation barrier is stopping steam (gas) to convert into liquid.

Thank you all.

April 13, 2016, 00:38	Problem in Axial turbine stage NonEquilibrium Calculation	#1
bharath Senior Member Bharath kumar Join Date: Apr 2009 Posts: 169 Rep Power: 17	Hi to all I am doing simulation for Axial turbine (Steam turbine) Last Stage Blade Non Equilibrium calculation using IAPWS table. 1)For Droplet Condensation, I used MUSIG approach for different size particle diameters (1µ to 20 µ). While doing post processing, I found that steam(liquid) temperature (Tl) is more than steam (Vapor) temperature (Tv). Tl > Tv 2) However when using small droplets model Steam (liquid) temperature is less than Steam (Vapor) temperature. Tl < Tv and I think this is right. Why Tl > Tv in MUSIG approach? Could any body help me regarding this issue. Thanks in advance

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April 19, 2016, 00:15		#2
bharath Senior Member Bharath kumar Join Date: Apr 2009 Posts: 169 Rep Power: 17	Hi, After further study I found the reason for this. At first in both models Tl>Tv.(i.e) steam (liquid) temperature is greater than Steam (gas) temperature. Previously, I noted it wrong. Steam (gas) is in super cooled state (otherwise metastable region) Tl is greater than the Tv. This is possible in meta stable regions and nucleation barrier is stopping steam (gas) to convert into liquid. Thank you all.