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Inside Heat Transfer Coefficient - Radiation

heat transfer radiation insulation pipe thermal

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#1 Neelakandan

Neelakandan

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Posted 07 December 2018 - 01:15 AM

Hello All,

 

I happened to work on Heat transfer calculation recently and have a doubt on the heat transfer through radiation.

 

Considering an insulated wall/pipe having heat source from inside (gas), we know that the heat transfer happens from inside through convection+radiation then conduction through wall and finally convection+radiation outside to the environment. But when I went through the example calculations and spreadsheets I noticed that the radiative heat transfer co-efficient from inside is often neglected and only the convective heat transfer co-efficient considered.  However for the outside I can see both convection and radiation heat transfer co-effts considered in all cases.

 

Could some on throw some light on this. Thank you so much.

 

Regards

Neel

Mechanical Engineer



#2 Dazzler

Dazzler

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Posted 03 January 2019 - 11:18 PM

Hi Neel,

Reason is you probably have fast moving gas in pipe inside and so it is turbulent regime flow, well mixed, even temperature of the gas from centre of pipe to the wall.  Convective heat transfer and conductive heat transfer through the gas "film" at the inside wall would be the governing heat transfer methods or terms, and radiation insignificant.

Dazzler






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