Heat transfer surface baffle pipes

Jackets, internal helical pipe coils, tube baffles, and plate coil baffles are used to provide heat-transfer surface area. The only surface area effective for heat transfer is that portion that is wetted by both service and process fluids. The effective heat-transfer area for some items may be determined as follows ... 

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. 

Helical coils, pipe baffles, and plate coil baffles are the most common heat transfer surfaces within the vessel. 

It is not expected, that the number and surface of the baffles exert an influence on the heat transfer. Indeed for a pipe coil and a propeller stirrer such an effect was not found. Thus is it certainly interesting, that Strek [532] established an unequivocal influence of baffle shape upon heat transfer. According to his propositions,... 

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