Convective instability and its suppression in packed-bed- and monolith reactors

Dynamic responses of packed bed reactors

“…If this is impractical, the effective conductivity can be increased by placing conductive rods in the catalyst bed. Yakhnin and Menzinger (1999a) and Jaree et al (2003a) discuss this technique in some detail.…”

High-Temperature Transients in Catalytic Fixed-Bed Reactors

“…A complementary and more widely applicable physical interpretation of the mechanism of high-temperature reactor response is based on the notion of dynamic instability and resonant amplification of perturbations, as described above (see also Yakhnin and Menzinger, 1999a). In the case of WWB, the amplification factor or gain can be defined as the maximum temperature overshoot of the adiabatic limit divided by the inlet temperature decrease that causes the transient.…”

“…Such passive inserts may have the shape of internal walls, plates, rods, etc., that run along the reactor axis (Houdry, 1947;Foulletier and Dassaud, 1959;Yakhnin and Menzinger, 1999a). These can be tube walls in multi-tubular reactors or, possibly, some other passive elements or inserts that may be specifically designed to enhance the axial conductivity of the bed.…”

Novel scheme for delaying reverse‐flow reactor runaway

“…This is possible if the thermal dispersion within the bed is Ž sufficient Matros, 1985;Keith et al, 1999;Yakhnin and . Menzinger, 1999 .…”