Tek-Tips is the largest IT community on the Internet today!

Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!

  • Congratulations cowski on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!

Free convection

Status
Not open for further replies.

googool

Mechanical
Joined
Mar 3, 2005
Messages
9
Location
EU
Hello
How can i calculate the average Nusslet number for free convection over rectangular duct
thx
 
You need to calculate the vertical sides seperate from the top & bottom surfaces. THen add up the conductivities using formulas for parallel resistances. "Advanced Heat Transfer" by Rosenhow & Choi has simplified formulas for upward facing, downward facing and verticla surfaces in contact with air.
 
Status
Not open for further replies.

Part and Inventory Search

Sponsor

Back
Top