Estimate the heat loss by natural convection from the surface of a heated horizontal cylindrical heater that has a surface temperature of 40°C and is immersed in water which is at a temperature of 26°C. From experiments , it is observed that the correlation Nu =0.53(GrPr)025 hold for all types of flow behavior. The properties of water at the mean temperature are : Density 994.9 kg/m2 Viscosity 7.65 kg/m s Specific heat 4.174 kJ/kg K Thermal conductivity 0.623 W/m K Coefficient if thermal expansion 3.26 x10 K

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