Heat and Mass Transfer problem 5, Assignments of Heat and Mass Transfer

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5. Consider a very long, slender rod. One end of the rod is attached to a base surface maintained at T, , while the surface of the rad is exposed to an air temperature of 400°C. Thermocouples imbedded in the rod at locations 25 and 120 mm from the base surface register temperatures of 300° C and 375° C, respectively. (a) Calculate the rod base temperature [ °C ). (b) Determine the rod length (mm) for the case where the ratio of the heat transfer from a finite length fin to the heat transfer from a very long fin under the same conditions is 99 percent. 7 ¥ ff} PEP figs / j ff Air foo oF * if eT Vey / Tos Re ~ Ae Ped ad wo be