In the apparatus developed at NJIT, for the determination of thermal contact res

Question

In the apparatus developed at NJIT, for the determination of thermal contact resistance (TCR) and thermal conductivity, the total thermal resistance, R_t, at the plastic-metal interface is related to the contact resistance, R_c, as R_t = t/k_p + 2R_c, where t is specimen thickness, and k_p its thermal conductivity. Figure 1 shows a plot of total thermal resistance for ABS at a mean temperature of 95 degree C. From the Figure, determine (a) the thermal conductivity and (b) the thermal contact resistance for the ABS sample (Note: The best-fit straight line through the data points does not pass through the origin (0, 0)).

Explanation / Answer

the straight line when extended meets the y axis at 0.00025

2RC=0.00025

RC =0.00025/2= 0.000125

slope =1/Kp = (0.004-0.002)/ (0.0007-0.0003) =5

Kp =1/5=0.2

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