| 摘要 |
A hollow cylindrical vessel comprising a cylindrical outer shell ( 12 ) and a cylindrical inner shell ( 14 ) joined by annular end caps ( 16 ), wherein at least one of: an end cap, or the cylindrical outer shell ( 12 ), or the cylindrical inner shell ( 14 ), is provided with an arrangement of recesses or protrusions ( 18 ). Preferably, the arrangement of recesses or protrusions is asymmetrical in all axes.
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