3/7/2024 0 Comments Agitator design handbook pdf![]() ![]() ![]() A helical ribbon impeller, or helix impeller, can be built with one or more flights, or continuous ribbon sections. And, heat transfer in high-viscosity agitated vessels can be challenging because the heat-transfer coefficients decrease as the viscosity increases. Little guidance has been published on this matter. ![]() Many engineers may not be aware of this problem, and, as a result, may not achieve the fastest cooling rate possible with their equipment. Therefore, net cooling reaches a maximum and then decreases if the impeller speed is increased. Although the heat-transfer rate initially increases with increasing agitation speed, at a certain point, the net heat removed from the process decreases because the agitator imparts heat to the process. If cooling is needed, as the agitation speed increases, it reaches an optimal level. Many of these applications require cooling of the vessel contents or removing heat of reaction. Examples include bulk polymerization reactors and viscous sugar solutions, among others. Several applications in the chemical process industries (CPI) require agitation of viscous fluids with viscosities in the 50,000 cP to 10 million cP range. This article demonstrates how to optimize net heat transfer to improve cooling. In cooling applications with high-viscosity fluids, agitator power input adds to the heat load. ![]()
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