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4,000원
원문정보
초록
영어
The objective of the present work is to develop a precise instrument for measuring the thermal property of insulating material over a temperature range from 30 K to near room temperature by utilizing a cryocooler. The instrument consists of two thermal links, a test sample, heat sink, heat source and vacuum vessel. The cold head of the cryocooler as a heat sink is thermally anchored to the thermal link and used to bring the apparatus to a desired temperature in a vacuum chamber. An electric heater as a heat source is placed in the middle of test sample for generating uniform heat flux. The entire apparatus is covered by thermal shields and wrapped in multi-layer insulation to minimize thermal radiation in a vacuum chamber. For a supplied heat flux the temperature distribution in the insulating material is measured in steady and transient state. The thermal conductivity of insulating material is measured from temperature difference for a given heat flux. In addition, the specific heat of insulating material is obtained by solving one-dimensional heat diffusion equation.
목차
Abstract 1. INTRODUCTION 2. EXPERIMENTAL SETUP 3. RESULTS AND DISCUSSION 4. CONCLUSION ACKNOWLEDGMENT REFERENCES INSTRUCTIONS FOR AUTHORS
저자
Yeon Suk Choi [ Korea Basic Science Institute, Daejeon 305-333, Korea ]
Corresponding Author
Dong Lak Kim [ Korea Basic Science Institute, Daejeon 305-333, Korea ]