No conjugate heat transfer between solid (cast iron) and fluid (water)

Rajaero · August 21, 2018, 22:00

Hello guys,
I am working on conjugate heat transfer problem in fluent. In my problem i have one solid zone (cast iron) and one fluid zone (water). cold water flowing inside to the solid part (like water flowing in a pipe). water is used to cool the solid part. I have created coupled interface (wall and wall shadow) between solid and fluid zone. The solution converged but there is no conjugate heat transfer occurs. I tried this problem many time with all possible way. please help me with this.

Boundary condition:
water inlet velocity = 2 m/s
water inlet temp = 303K
outlet pressure = 2.5bar
solid part temperature = 453K (I dont have h and heat flux value)

Questions:
1. how to set thermal boundary condition if i only know solid temperature?
2. solution converged but no conjugate heat transfer taking place?

Thanks in advance...Its urgent please help me with this guys.

LuckyTran · August 23, 2018, 14:01

The thermal boundary condition at wall and wall shadow should be coupled and not a temperature or heat flux. The momentum BC is no-slip.

August 21, 2018, 22:00	No conjugate heat transfer between solid (cast iron) and fluid (water)	#1
Rajaero Member Taiwan,new north city Join Date: Aug 2017 Location: Taiwan Posts: 74 Rep Power: 9	Hello guys, I am working on conjugate heat transfer problem in fluent. In my problem i have one solid zone (cast iron) and one fluid zone (water). cold water flowing inside to the solid part (like water flowing in a pipe). water is used to cool the solid part. I have created coupled interface (wall and wall shadow) between solid and fluid zone. The solution converged but there is no conjugate heat transfer occurs. I tried this problem many time with all possible way. please help me with this. Boundary condition: water inlet velocity = 2 m/s water inlet temp = 303K outlet pressure = 2.5bar solid part temperature = 453K (I dont have h and heat flux value) Questions: 1. how to set thermal boundary condition if i only know solid temperature? 2. solution converged but no conjugate heat transfer taking place? Thanks in advance...Its urgent please help me with this guys.

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August 23, 2018, 14:01		#2
LuckyTran Senior Member Lucky Join Date: Apr 2011 Location: Orlando, FL USA Posts: 5,761 Rep Power: 66	The thermal boundary condition at wall and wall shadow should be coupled and not a temperature or heat flux. The momentum BC is no-slip.