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HWAHAK KONGHAK,
Vol.35, No.5, 762-768, 1997
Vol.35, No.5, 762-768, 1997
전이 일차원 열류기법을 이용한 다공층의 열전도도 측정
Measurement of Thermal Conductivities of Porous Bed using Transient One-Dimensional Heat Flow Technique
흡착이나 화학반응이 일어나는 반응층에서의 열전달 현상을 해석하기 위해서는 열전도도를 정확히 아는 것이 중요하다. 본 연구에서는 반응층의 열전도도 측정 방법으로서 전이 일차원 열류기법을 제시하였다. 장치를 직접 제작하였으며, NIST에서 입수한 stainless steel의 표준시편을 이용하여 실험오차 2% 이내로 장치의 신뢰성을 검증하였다. 실제로 반응층의 열전도 매개체로 이용되는 팽창흑연 지지체에 대하여 실험을 수행하였다. 0.1-0.4 g/㎤의 겉보기 밀도를 가지는 흑연지지체에 대하여 축방향의 열전도도는 4.1-20.0 W/mK의 범위에 있었으며, 반지름 방향의 열전도도는 4.6-42.3 W/mK의 범위에 있었다.
Accurate thermal conductivity measurements are important in order to analyze the thermal transport phenomena inside the reaction beds. In this study, the transient one-dimensional heat flow technique was used as a direct method of thermal conductivity measurement for reaction beds. The experimental apparatus was built based on this method and measurements on the standard sample from NIST confirmed that this technique is accurate to within 2%. Measurements of thermal conductivities were also carried out with graphite matrices used as heat conductive medium in reaction beds. For graphite matrices with bulk densities of 0.1-0.4g/cm3, the thermal conductivities in the axial direction were in the range of 4.1-20.0W/mK, while the thermal conductivities in the radial direction were in the range of 4.6-42.3W/mK.
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