A laser in an aluminum cylindrical housing with diameter D

A laser in an aluminum cylindrical housing with diameter D = 12.7 mm and length, L = 50 mm. The laser consumes 2 NV of electrical power. The laser is ~7% efficient and emits 100 mW of optical radiation. The remaining 1 W is dissipated thermally. To cool the laser an external fan blows air over the laser with T = 25 degree C and u_infinity = 10 m/s. (a) Evaluating your properties at a film temperature of 500 K, estimate the temperature of the laser housing neglecting heat transfer from the ends, (b) Iterate the solution (with interpolation as necessary) so that it converges to less than 5%

Solution

Need formuae from Handbooks involving Nusselt number at film temp of 500k

nU =Hd/K

need to know all these parameters, k of al etc.