%0 Journal Article %A Chao, Chen-I %A Lin, Wei-Keng %A Chen, Shao-Wen %A Yao, Han-Chou %D 2016 %I Begell House %K thermal diffusivity, Angstrom method, spreading thermal conductivity %N 7 %P 617-632 %R 10.1615/HeatTransRes.2016010720 %T FEASIBILITY OF THE ANGSTROM METHOD IN PERFORMING THE MEASUREMENT OF THERMAL CONDUCTIVITY IN VAPOR CHAMBERS %U https://www.dl.begellhouse.com/journals/46784ef93dddff27,5e72dd4008848039,10f1710b0bb61240.html %V 47 %X The present work investigates the feasibility of using the theoretical model of the Angstrom 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 Angstrom 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 after 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. %8 2016-07-13