Tutorial 4.doc

# Tutorial 4.doc - HEAT AND MASS TRANSFER BMCT 3143 TUTORIAL...

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HEAT AND MASS TRANSFER BMCT 3143 TUTORIAL 04 DR MOHD YUSOFF SULAIMAN JUN2010 HEAT AND MASS TRANSFER BMCT 3143 TUTORIAL 04 – Unsteady State Conduction 1. A large slab of brick [k = 1.07 W/m · K, = 5.4 x 10 -7 m 2 ] is initially at a uniform temperature of 20°C. One surface is suddenly exposed to a uniform heat flux of 4500 W/m 2 . Calculate and plot the surface temperature as a function of time. Also calculate the heat flux through the plane 2.0 cm deep when the surface temperature reaches 150°C. 2. A cube of aluminum 11 cm on each side is initially at a temperature of 400°C. It is suddenly immersed in a tank of oil maintained at 85°C. The convection coefficient is 1100 W/m 2 · K. Calculate the temperature at the center of one face after a time of 1 min. 3. A boy decides to place his glass marbles in an oven at 200°C. The diameter of the marbles is 15 mm. After a while he takes them from the oven and places them in room air at 20°C to cool. The convection heat transfer coefficient is approximately 14 W/m 2 · K. Calculate the time the boy must wait until centre temperature of the
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