If the fluid moves too slowly, the result is what’s called “laminar flow,” where the outer fluid layers insulate the inner fluid layers and limit heat-transfer capacity. To ensure that proper process temperatures are maintained, TCUs must not only deliver heat-transfer fluid at the proper temperature, but they must also provide “turbulent flow.” Turbulent flow is important because as the process fluid flows through the passages of a mold, only the fluid in contact with the cooling channel surface will readily transfer heat. The two fluids never mix, so different fluids can be used in the process and cooling circuits.
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