Consider the rotating disk of .16. A disk-shaped,

Chapter 6, Problem 6.17

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Consider the rotating disk of 6.16. A disk-shaped, stationary plate is placed a short distance awayfrom the rotating disk, forming a gap of width g.The stationary plate and ambient air are at T??20C.If the flow is laminar and the gap-to-radius ratio,G?g/ro, is small, the local radial Nusselt number dis-tribution is of the formNur?h(r)rk?70(1?e?140G) Re?0.456roRe0.478rSupport tuberroConnections toelectric heaterTsAirTNuD 421CH006.qxd 2/24/11 3:32 PM Page 421 where Rer??r2/?[Pelle J., and S. Harmand, Exp.Thermal Fluid Science, 31, 165, 2007]. Determine thevalue of the average Nusselt number, where D?2ro. If the rotating disk temperature isTs?50C, what is the total heat flux from the diskstop surface for g?1 mm, ??150 rad/s? What is thetotal electric power requirement? What can you sayabout the nature of the flow between the disks?

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