Dayananda

DAYANANDA SAGAR COLLEGE OF ENGINEERING, BANGALORE DEPARTMENT OF MECHANICAL ENGINEERING INTERNAL ASSESSMENT 1 Subject: ignite and Mass Transfer (06ME65) Date:13-03-2010 Semester: eight-spot (Old Scheme) Marks :50 tear down: Answer whatever Five Questions Choosing at least dickens Question From to each one Part Part A 1) A intricate palisade is as shown in fig. shoot for the rate of foment outrage 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 argue is make of inside slica brick (k = 16 W/mk) removed magnesium oxide brick (k= 4. 8 W/mk) 10 cm thick each, if the midland and outer(prenominal) bob ups are receptive to temperature 820? and 120 ? find rouse run finished wall per unit area. Assume a adjoin resistance of 0.02 m2k/w. subside 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 pipework 100 mm Outer diameter is covered with devil layers of insulating clobber each 25 mm thick, one having thermic conductivity thrice the other. Determine the fortune increase in heat loss when th e 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 cxxv 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 1) An electric...If you want to discover a full essay, order it on our website: BestEssayCheap.com

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