EXPERIMENTAL EVALUATION OF HEAT RADIATION COMPONENT USING A HIGH THERMAL CONDUCTIVITY CFRP

摘要

Carbon fiber reinforced plastics (CFRP) are used in various fields, especially in aerospace engineering, due to their high specific modulus and strength. Because pitch-based carbon fibers have high thermal conductivity, their composites are expected to be used as heat control materials. Considering a carbon fiber unidirectional composite, it may have anisotropy in thermal conductivity, that is, it is high in fiber direction whereas low in the direction perpendicular to the fibers. One of the possible applications of the composite is a heat sink with reduced weight. In the present study, Thermal conductivities in longitudinal and transverse directions of a CFRP unidirectional composite are evaluated experimentally. Laser flash method is employed to measure thermal conductivity. To discuss the experimental results, rules of mixture predictions and two-dimensional steady-state and transient heat transfer simulations are conducted. In addition, a heat sink is made with the CFRP. The heat radiation performance under natural convection (the thermal resistance) is compared with heat sinks made of aluminum with different surface treatment. Effect of heat radiation is discussed both experimentally and analytically. Three-dimensional steady-state heat transfer simulations are performed to compare with the experiment result.