TY - JOUR T1 - Transient free convection between two concentric spheres filled witha porous medium JO - Journal of Thermophysics and Heat Transfer PY - 1993/01/01 AU - Pop I AU - Ingham DB AU - Cheng P ED - DO - DOI: 10.2514/3.483 PB - American Institute of Aeronautics and Astronautics (AIAA) VL - 7 IS - 4 SP - 724 EP - 727 Y2 - 2025/07/27 ER -