Learning Forum

[J.LoongHee]

Hi all,

We are seeking advice choosing an appropriate assumption for refractory wall and water cooled tube wall emissivities in a high temperature furnace.

 

The furnace 0.9 x 0.9 x 3.5m.The furnace walls are made of light density, vacuum formed, alumina fibre. Furnace is natural gas and hydrogen fire, and it is fitted with stainless steel water cooled tubes

The focus of the work is predicting radiative heat transfer to the water cooled tubes. These are positioned 50mm inboard of the side walls. There are 5 tubes along each side wall ~0.6m apart.

Refractory wall temperatures are likely to be in the region of 1200-1400degC and water cooled tube surface temperatures ~100degC.

Could you advise me on this please? 

Thanks
Jee 

[SVV]

Hi,

I would recommend you to refer to heat transfer text books and journals to get an appropriate value of material properties for the working condition.