Influence of heat source characteristics on dimensionless thermal spreading resistance

Thermal spreading resistance (TSR) for eccentric circular, square and equilateral triangular heat sources on circular heat flux tubes are conducted in this paper. It is shown that the eccentricity has a great influence on TSR. Our numerical results concerning the TSR are in good agreement with Bairi & Laraqi's analytical data. Influence of the shapes on TSR is studied utilizing a series of isosceles triangular heat sources on circular heat flux tubes and rectangular heat sources on square heat flux tubes. The numerical results show that the TSR is strongly dependent on the ratio of inscribed circle radius to circumcircle radius of the heat source. Effect of heat source with fractal boundary on dimensionless TSR is also carried out when the heat source area of every tube is kept at a constant value. The numerical results show that TSR decreases as the construction number N increases and the variation of amplitude of TSR increases as the relative contact size increases.