Pls let me know the charges for these assignments. Document Preview: ME012D: HEAT TRANSFER Assignment 2 1) Using dimensional analysis of the forced heat transfer coefficent, derive the expression for the Nusselt number in terms of the Prandtl number and the Reynolds number. 2) A steam pipe 6cm in diameter is covered 2cm thick insulation which has a emissivity of 0.92. the insulation surface is 750C and the pipe is placed in atmosphere 250C. Considering the heat loss both by radiation and natural convection estimate the heat loss from 5m length of the pipe, also calculate the overall heat transfer coefficient and heat transfer coefficient due radiation alone. 3) Air at 2 bar and 400C is heated and flows through a 30mm diameter tube at a velocity of 10m/sec, if the wall temperature is maintained at 1000C, all along the length find the heat transfer per unit length of the tube , also find the temperature rise per unit length of the tube using the relation , 0.8 0.4 Nu = 0.023Re Pr The following properties relates to the air at average film temperature of the film 0.0297 /deg Pr 0.694 20 10 sec/1.009 /deg 6 2 = = = Ž?? = k W m N m C kJ kg p ?Ž? 4)A black body of 0.2 m2 area has an effective temperature of 800K, calculate the total rate of energy emission , intensity of normal radiation, intensity of radiation along a direction at 500 to the normal and also find the wave length of maximum monochromatic emissive power. 5) Exhaust gases flowing through a tubular heat exchanger at the rate of 20kg/min are cooled from 4000C to 1290Cby water initially at 100C. The specific heat of the gases may be taken as 1.13kJ/kg-deg and the overall heat transfer coefficient may be taken as 502kJ/m2-hr-deg.If the water flow rate is 25kg/mincalculate the surface area required for the 1) Counter flow arrangement 2) parallel flow heat exchanger Attachments: ME012D.pdfMA003D.pdfME017D.pdfME017D1-.pdfME024D.pdf