Department;
of;
Power;
Engineering,;
Southeast;
University,;
Nanjing;
210096,;
China;
Department;
of;
Power;
Engineering,;
Southeast;
University,;
Nanjing;
210096,;
China;
Department;
of;
Power;
Engineering,;
Southeast;
University,;
Nanjing;
210096,;
China;
polyurethane; foam,; porous; media,; thermal; conductivity,; fractal.;