STUDY ON COMBINED CONDUCTIVE AND RADIATIVE HEAT TRANSFER IN POLYIMIDE FOAM FOR SPACE USE
Spacecrafts going to inner or outer planets need to increase the insulation performance and also evaluate its thermal performance precisely in order to decrease heater power. Our goal is to develop the new insulation system for spacecrafts instead of the traditional Multi Layer Insulation (MLI). Due to its high heat resistance, light weight, and high resistance to space environments, the porous super insulation polyimide foam (PI-F) is expected to progressively advance the spacecraft thermal insulation technique. In order to design the PI-F thermal insulation system, it is essential to clarify the thermal performance with combined phenomena of conductive and radiative heat transfer in PI-F. Lattice Boltzmann Method (LBM) has been applied to estimate the thermal conductivity of PI-F. Its three-dimensional simulation model is constructed by observing inner structure of PI-F by X-ray CT. The estimated thermal conductivities show good agreement with the experimental values in both atmospheric and vacuum conditions. Especially, the estimated values have the same tendency of density dependence as the experimental values, and the density to minimize its thermal conductivity was observed.
Yuki Mizutani Sumitaka Tachikawa Akira Ohnishi Kentaro Kajihara Yuji Nagasaka
Graduate school of System Design Engineering Keio University 3-14-1, Hiyoshi, Yokohama, Kanagawa 223 Thermal Engineering Group SAS/JAXA 3-1-1, Yoshinodai, Sagamihara, Kanagawa 229-8510, Japan Department of Spacecraft Engineering ISAS/JAXA 3-1-1, Yoshinodai, Sagamihara, Kanagawa 229-8510, Jap Industrial Application Division JASRI 1-1-1, Kouto, Sanyo, Hyogo 679-5198, Japan Department of System Design Engineering Keio University 3-14-1, Hiyoshi, Yokohama, Kanagawa 223-8522
国际会议
The Ninth Asian Thermophysical Properties Conference(第九届亚洲热物理性能会议 ATPC 2010)
北京
英文
610-614
2010-10-19（万方平台首次上网日期，不代表论文的发表时间）