Engineering, 15.10.2019 01:20 grace1248
Along plastic rod of 20-mm diameter (k = 0.3 w/m ⋅ k and rhocp = 1040 kj/m3 ⋅ k) is uniformly heated in an oven as preparation for a pressing operation. for best results, the temperature in the rod should not be less than 200°c. to what uniform temperature should the rod be heated in the oven if, for the worst case, the rod sits on a conveyor for 3 min while exposed to convection cooling with ambient air at 25°c and with a convection coefficient of 10 w/m2 ⋅ k? a further condition for good results is a maximum–minimum temperature difference of less than 10°c. is this condition satisfied? if not, what could you do to satisfy it?
Answers: 1
Engineering, 04.07.2019 18:10, lowkeyqueenk
Apipe with an outside diameter of 15 cm is exposed to an ambient air and surrounding temperature of -20°c. the pipe has an outer surface temperature of 65°c and an emissivity of 0.85. if the rate of heat loss from the pipe surface is 0.95 kw per meter of length, the external convective heat transfer coefficient (h) is: (a) 12.5 w/m"k (b) 18.6 w/mk (c) 23.7 w/mk (d) 27.9 w/mk (e) 33.5 w/mk
Answers: 1
Engineering, 06.07.2019 03:10, netflixacc0107
Consider two concentric spheres forming an enclosure with diameters of 12 cm and 18 cm the spheres are maintained at uniform temperatures ti-50°c and t2 = 250°c and have emissivities .45 and .8, respectively. determine the net rate of radiation heat transfer between the two spheres per unit surface area.
Answers: 1
Along plastic rod of 20-mm diameter (k = 0.3 w/m ⋅ k and rhocp = 1040 kj/m3 ⋅ k) is uniformly heated...
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