Many of the solid surfaces for which values of the thermal

Chapter , Problem 8.112

(choose chapter or problem)

Many of the solid surfaces for which values of the thermal and momentum accommodation coefficients have been measured are quite different from those used in micro- and nanodevices. Plot the Nusselt number NuD associated with fully developed laminar flow with constant surface heat flux versus tube diameter for 1 m D 1 mm and (i) t 1, p 1, (ii) t 0.1, p 0.1, (iii) t 1, p 0.1, and (iv) t 0.1, p 1. For tubes of what diameter do the accommodation coefficients begin to influence convection heat transfer? For which combination of t and p does the Nusselt number exhibit the least sensitivity to changes in the diameter of the tube? Which combination results in Nusselt numbers greater than the conventional fully developed laminar value for constant heat flux conditions, NuD 4.36? Which combination is associated with the smallest Nusselt numbers? What can you say about the ability to predict convection heat transfer coefficients in a small-scale device if the 558 Chap accommodation coefficients are not known for material from which the device is fabricated? Use properties of air at atmospheric pressure and T 300 K.

Unfortunately, we don't have that question answered yet. But you can get it answered in just 5 hours by Logging in or Becoming a subscriber.

Becoming a subscriber
Or look for another answer

×

Login

Login or Sign up for access to all of our study tools and educational content!

Forgot password?
Register Now

×

Register

Sign up for access to all content on our site!

Or login if you already have an account

×

Reset password

If you have an active account we’ll send you an e-mail for password recovery

Or login if you have your password back