Air at 1 bar is contained between two concentric spheres both having area of ( 1.2 mathrm{~m}^{2} ) each are separated by a distance of ( 2 mathrm{~cm} ) and maintained at temperature of 300 and ( 390 mathrm{~K} ). Evaluate the free convection heat transfer across the air gap. Given parameter ( C=0.228, n=0.226 ) and ( m=0 ). [6 mark

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Air at 1 bar is contained between two concentric spheres both having area of  ( 1.2  mathrm{~m}^{2}  ) each are separated by a distance of  ( 2  mathrm{~cm}  ) and maintained at temperature of 300 and  ( 390  mathrm{~K}  ). Evaluate the free convection heat transfer across the air gap. Given parameter  ( C=0.228, n=0.226  ) and  ( m=0  ). [6 marks]

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