Nonstationary gas filtration in a two-layered heat shield

Chapter 14: Mathematical Modeling of Heat and Mass Transfer during Aerothermochemical Destruction of Thermal Protection Materials

“…At the same time, it should be noted that the process of gas filtration through pores in the material can be essentially non-one-dimensional. As an example, we can mention a paper [37] where this process was considered under conditions of significant differences in pressure over the vehicle surface. As another example, we can mention the tests of small-size cylindrical samples with nonprotected side surfaces in a plasmatron jet, where significant leakage of gases from the stagnation point region to the zone with reduced pressure may occur because of side heating.…”