. A liquid of mass 7 kg and specific heat 4 kJ/kg K is contained in a cylinder type heater of diameter 0.15 m and height

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A Liquid Of Mass 7 Kg And Specific Heat 4 Kj Kg K Is Contained In A Cylinder Type Heater Of Diameter 0 15 M And Height 1 (31.6 KiB) Viewed 16 times

Initial temp is 100°C
. A liquid of mass 7 kg and specific heat 4 kJ/kg K is contained in a cylinder type heater of diameter 0.15 m and height 0.40 m. The cylinder surface is exposed to the atmosphere at 20°C. Both sides caps of the cylinder are completely insulated to prevent heat leakage from the ends. Following data are noted: Heater wall thickness and thermal conductivity = 2 mm and 10 W/mK, respectively. Heat transfer coefficient of liquid and air = 100 W/m²K, and 10 W/m²K, respectively. Calculate (1) Overall heat transfer coefficient (ii) time required the temperature of the fluid to reduce 50 °C after the heater is switched off.