The boundary induced error on the measurement of thermal conductivity by transient hot wire method

An analysis of the dimension influence on the measurement accuracy of thermal conductivities by transient hot wire/probe method is made. The radial and axial effects are discussed separately under the supposition of constant boundary temperatures. The results show that the radial and axial lengths of the measured sample, the radius ratio and heat capacity ratio of sample to hot wire/probe, as well as the length to diameter ratio of the hot wire/probe are important parameters in error analysis. Former analysis underestimated the boundary effects. New criteria for error analysis are established.