Methods for processing the contents of containers and tanks and methods for modifying the processing capabilities of tanks and containers

A method for modifying the processing capabilities of a container, the method comprising:

• providing a container defining a cavity to receive material for processing, the container comprising:
• a side wall connecting a top wall to a bottom wall:
• a vane structure comprising a first edge against the side wall and spiraling entirely around the container for a plurality of times, the vane structure comprising and a second edge opposite the first edge, the second edge spaced from the side wall;
• and
• a housing against the second edge of the vane structure and spaced from the side wall of the container, the housing sealing the side wall and vane structure from the environment wherein the housing, vane structure and side wall establish a fluid passage spiraling entirely around the container for a plurality of times, the side wall having thermal energy transfer characteristics, at least one of the thermal energy transfer characteristics comprising a first value;
• and
• changing the first value of the one thermal energy transfer characteristic to a second value for at least a first portion of the side wall, the second value being different from the first value.