Using the naphthalene sublimation technique, the
Chapter 6, Problem 6.69(choose chapter or problem)
Using the naphthalene sublimation technique, the radialdistribution of the local convection mass transfer coeffi-cient for uniform flow normal to a circular disk hasbeen correlated by an expression of the formShD?hm(r)DDAB?Sho?1?a?rro?n? The stagnation point Sherwood number (Sho) depends onthe Reynolds (ReD?VD/?) and Schmidt (Sc??/DAB)numbers, and data have been correlated by the follow-ing expression:Obtain an expression for the average Nusselt numbercorresponding to heat transfer froman isothermal disk exposed to the foregoing flowconditions. If a?1.2 and n?5.5, what is the rate ofheat transfer from a disk of diameter D?20 mm and sur-face temperature Ts?125C to an airstream for whichReD?5?104and T??25C? Typically, boundarylayer development from a stagnation point yields adecaying convection coefficient with increasing distancefrom the stagnation point. Provide a plausible explana-tion for why the opposite trend is observed for the disk.
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