Contents - Index


SR_5

 

 

Function SR_5(a, b, k) returns the thermal resistance between the surface of a rectangular contact area that is exposed to a uniform heat flux and is located on the surface of a semi-infinite half-space.  The resistance is based on the area-averaged temperature of the rectangle (SR_4 provides the resistance based on the center temperature).

 

The calling protocol is:

 

R = SR_5(a, b, k)

 

Inputs:

a = half-width of the larger dimension of the rectangle [m or ft]

b = half-width of the smaller dimension of the rectangle [m or ft]

k = thermal conductivity of the material [W/m-K or Btu/hr-ft-R]

 

Outputs:

R = resistance [K/W or R-hr/Btu]

 

Rohsenow, W.M, J. P. Hartnett, and Y. I. Cho, Handbook of Heat Transfer, 3rd Edition, McGraw Hill, (1998).

 

Example: 

$UnitSystem SI Mass J K Pa Radian

$VarInfo R5 units=K/W

a=1 [m]

b=1 [m]

k=1 [W/m-K]

R5=sr_5(a,b,k)

 

{Solution:

R5=0.2366 [K/W]}

 

Spreading Resistance Index