摘要
The present work investigates the feasibility of using the theoretical model of the Ångström method for measuring the spreading of thermal conductivity in vapor chambers. A spreading thermal conductivity measuring platform that utilizes cooling modules with programed modulators to provide temperature modulation was designed, and Visual Basic and PLC-programable modulators were used in the development of a spreading thermal conductivity measuring programed for the feasibility studies involving vapor chambers. The present paper is divided into a 1D model and a 2D model according to the theoretical model of the Ångström method, and theoretical analyses were conducted in both of those modes, respectively. In accordance with practical industrial requirements, a thermal diffusivity measuring platform and a heat capacity measuring system were designed. For the design of aspect ratio experiments, copper plates with different aspect ratios τ were used in the testing of measurement results from various theoretical models. Copper plates with aspect ratios τ smaller than 0.066 were used in the 1D model, while subjects with aspect ratios τ greater than 0.066 were used in the 2D model. The respective measurement results were obtained af er applying these models to vapor chambers: a Module-11 copper vapor chamber exhibited a spreading thermal conductivity of 1390 W/m·K and a Module-N10 aluminum vapor chamber exhibited a spreading thermal conductivity of 608 W/m·K. These results, by expressing the spreading thermal conductivity of vapor chambers in numerical terms, also indicated that the purpose of this study was successfully achieved.