Heat Transfer Between Solid Surfaces in Contact Having a Relatively Large Gap (External Thermal Resistance of a Heat Pipe)

Abstract

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.

Simple Evaluation Method for Effective Thermal Conductivity of a Wick Structure Filled with a Working Fluid

“…Figure 2 shows an experimental apparatus. The apparatus is essentially the same as described in the previous papers (Tomimura et al, 2011;Koito et al, 2014). Brass rods having the size of 25 mm (depth)  25 mm (width)  45 mm (height) were used as the upper and the lower rod.…”

“…From the temperature distribution, the value of thermal conductivity of a sample is obtained by using Fourier's law. This measurement method was also applied for the study to evaluate the heat transfer between solid surfaces in contact (Koito et al, 2014).…”