Mixing heat transfer Helical coils

Oldshue, J. Y. and A. T. Gretton, Helical Coil Heat Transfer in Mixing Vessels, Chem. Eng. Prog. 50, 1954, 615. 

Oldshue J.Y., Gretton A.T., Helical coil heat transfer in mixing vessels, Chem. Engng. Progr. 50 (1954) 12, p. 615-621... 

Heat Transfer Surfaces. When the process requires heat addition to or removal from the process fluid, the mixing tank must be equipped with appropriate heat transfer surfaces. Liquid motion supplied by the mixer enhances the heat transfer coefficient. Commonly used heat transfer surfaces, shown in Figure 6-8, include jackets, internal helical coils, and internal baffle coils. A jacket can be a tank outside the main tank, baffled, half-pipe, or dimpled. Each of these heat transfer surfaces can also be used in combination with a single coil or multiple heating coils installed within the space between the impeller and the tank wall. A suitable heat transfer fluid must be supplied on the service side of the heat transfer surfaces. 

---