Kenics heat exchanger is used in the melt cooling area for underwater pelletizing systems. Static-mixer technology delivers high heat transfer coefficients for uniform heat transfer. The heat exchanger consists of a continuous string of static-mixer elements within each heat exchanger tube. Fluid flow is directed radially toward the pipe walls and back to the element, regardless of velocity. Momentum reversal and flow division contribute to mixing efficiency. All processed material is continuously intermixed to eliminate radial gradients in temperature and material composition.