A metal ball of diameter 60 mm is initially at 220°C. The ball is suddenly cooled by an air jet of 20°C. The heat transfer coefficient is 200 W/m 2 K. The specific heat, thermal conductivity and density of the metal ball are 400 J/kg. 400 W/mK and 9000 kg/m 3 , respectively. The ball temperature (in °C) after 90 seconds will be approximately

GATE Mechanical Engineering (ME) 2017 Shift 2 Solved Paper

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A metal ball of diameter 60 mm is initially at 220°C. The ball is suddenly cooled by an air jet of 20°C. The heat transfer coefficient is 200 W/m²K. The specific heat, thermal conductivity and density of the metal ball are 400 J/kg. 400 W/mK and 9000 kg/m³, respectively. The ball temperature (in °C) after 90 seconds will be approximately

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