Ceramic intermediate tube for exchanging heat and recuperator with such a tube

摘要

The recuperator has an inner tube, an outer tube and a heat-conducting intermediate tube (1). The wall of the intermediate tube bulges at various places over its length and round its circumference to produce outward (5) and inward (6) knobs. These knobs increase the heat transmission surface of the intermediate tube. A narrowing of the flow path adjacent to a widening of it is formed between adjacent knobs. This alternately expands and compresses the fluid, reducing the boundary layer build-up.