Experimental and numerical analyses are conducted to investigate the heat transfer characteristics of two rectangular rods in contact, where a relatively large gap is present. Sixteen types of wedge-shaped gaps having different sizes are investigated in the experiment. Using the thermal resistance network method, the temperature distribution is obtained numerically and the discussion is made on the heat transfer characteristics around the gap. It is confirmed that the constriction/spreading of heat flow inside the rods greatly affects the thermal resistance of the gap. Fairly good agreement is obtained between the experimental and the numerical results.

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