DEPARTMENT OF MECHANICAL ENGINEERING
INTERNAL ASSESSMENT 1
Subject: ignite and Mass Transfer (06ME65) Date:13-03-2010
Semester: VIII (Old Scheme) Marks :50
tear down: Answer Any Five Questions Choosing at least dickens Question From each Part
Part A
1) A intricate palisade is as shown in fig. shoot for the rate of foment loss from ka = 18.88 W/mk, Kb=2.77 W/mk, Kc = 2.32 W/mk, Kd = 1.9 W/mk, Ke = 1.16 W/mk, Kf = 1.37 W/mk . hi =8500 W/m2k, ho = 2000 W/m2k. Tin = 900? , Tout = 40? . (10)
2) A furnace wall is made of inside slica brick (k = 16 W/mk) outside magnesium oxide brick (k= 4.8 W/mk) 10 cm thick each, if the inner and outer(prenominal) surfaces are exposed to temperature 820? and 120 ? find heat run through wall per unit area. Assume a adjoin resistance of 0.02 m2k/w. Determine the rate of heat transfer and appeal the temperature profile through the composite wall.
The inside and outside passion Transfer coefficients are 35w/m2k and 12 W/m2k respectively (10)
3) A steam pipe 100 mm Outer diameter is covered with two layers of insulating clobber each 25 mm thick, one having thermal conductivity thrice the other. Determine the fortune increase in heat loss when the better insulating material is inside than when it is outside. (10)
4) A long Hollow cylinder is constructed from a material whose k = 0.01+0.001 T Where T is in ? and k is in W/mk. The inner and outer radius of the cylinder are 125 mm and 250 mm resp. Under soused state conditions the inner and outer temperature are 425 ? and 90? resp. Calculate 1) The rate of heat flow/meter length 2) The temperature of the dividing line on the outside of the cylinder. If the surface heat transfer coefficient on the exterior surface is 14.5 W/m2k. (10)
Part B
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