Thermal Contact Resistance
Basic thermal contact resistance between two materials
Fundamental equation is:
The Thermal Contact Resistance component models a heat transfer between two materials which have different thermal conductivities.
The following image illustrates an example of apparent contact area of two materials.
Because of the surface roughness of both materials, the actual contact area of two materials becomes spots of contact. The other areas are regarded as the void space filled by fluid such as air. The following image illustrates the mechanism of jointed surface in more detail.
Then heat flow of the contact of two materials is regarded as the following image. This component is based on this.
Using each option, you can control the apparent area size, area ratio, and the thickness of void space by real input signals.That makes it possible for you to change contact resistance value during simulation. For example, change by deformation of actual contact area size caused by joint pressure change.
The equation for the areas is shown below:
The equation for heat flow is as below:
 : J. P. Holman. "Heat Transfer Ninth Edition", McGraw-Hill Higher Education.
Heat flow rate from port a to port b
Temperature difference between port a and port b
Thermal contact resistance
Coefficient of thermal contact conductance, which is the inverse of Rc
Apparent contact area
Actual contact area
Area of void space
Thickness of the void space
Thermal port a
Thermal port b
if use Apparent contact area input is
Apparent contact area is defined by Real signal input.
if use Area ratio input is
Area ratio A__cA is defined by Real signal input.
if use Void space thickness input is
Thickness of the void space is defined by Real signal input.
Solid material property data
Material_a.k is the thermal conductivity of the material of port_a
Material_a.cp is the specific heat capacity of the material of port_a
Material_a.rho is the density of the material of port_a
Material_b.k is the thermal conductivity of the material of port_b
Material_b.cp is the specific heat capacity of the material of port_b
Material_b.rho is the density of the material of port_b
The thermal conductivity of the fluid which fills void space
Apparent contact area between materials
Area ratio A__cA (between 0 and 1)
Initial heat flow rate
Initial temperature difference
Heat Transfer Library Overview
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