Abstract
The additional thermal resistance associated with the geometrical constriction is often encountered in the electronic components like relay circuits, the printed circuit boards, and so on. In these cases, heat is transferred frequently through a thin and narrow passage. In the present study, as a first step to propose an estimation equation for simple thermal network analysis of electronic components, the thermal constriction resistance of a thin plate has been intensively studied. Furthermore, heat flow of two thin plates connected by a narrow passage has been shown, and the effect of the plate length on the resistance has been clarified.
