Straight-Base Rectangular Fin
Dimensional: eta_fin_straight_rect(th, L, h, k)
Function eta_fin_straight_rect calculates the fin efficiency of a straight fin with a rectangular base. This function is applicable for a fin where W>>th (i.e., the fin is infinitely long into the page). To account for the convection from the tip, the function will use a corrected length where:
The function then calls a corresponding non-dimensional function, which determines the fin efficiency in terms of the fin parameter mL, described below. Note that the fin surface area that should be used with this fin efficiency is:
Inputs:
L - length of the fin [m or ft]
th - thickness of the fin [m or ft]
h - heat transfer coefficient [W/m^2-K or Btu/hr-ft^2-R]
k - conductivity of fin material [W/m-K or Btu/hr-ft-R]
The units for the inputs to the function are based on the unit setting in EES.
Example:
$UnitSystem SI K Pa J
L=0.06 [m]
th=0.003 [m]
h=60 [W/m^2-K]
k=200 [W/m-K]
eta=eta_fin_straight_rect(th, L, h, k)
{Solution:
eta=0.8063}
Non-dimensional: eta_fin_straight_rect_ND(mL)
Function eta_fin_straight_rect_ND returns the fin efficiency of a straight fin with a rectangular base given the product of the fin parameter, m, and fin length, L, where m is defined as:
