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Journal articles
Open Access
Using the Drainage Time to evaluate Mechanical Pulps, February 1988, TAPPI Journal 88FEB115

Using the drainage time to evaluate mechanical pulps, TAPPI JOURNAL February 1988

Journal articles
Open Access
Oxygen bleaching of kraft pulp: high consistency vs. medium consistency, TAPPI JOURNAL February 1988 88FEB47

Oxygen bleaching of kraft pulp: high consistency vs. medium consistency, TAPPI JOURNAL February 1988

Journal articles
Open Access
Process chemistry and control of rapid-displacement heating, TAPPI JOURNAL February 1988 88FEB51

Process chemistry and control of rapid-displacement heating, TAPPI JOURNAL February 1988

Journal articles
Open Access
Ultra-high-solids evaporation of black liquor, TAPPI JOURNAL February 1988 88FEB61

Ultra-high-solids evaporation of black liquor, TAPPI JOURNAL February 1988

Journal articles
Open Access
Meltblown polyester solves a food processing filtration problem, TAPPI JOURNAL February 1988 88FEB79

Meltblown polyester solves a food processing filtration problem, TAPPI JOURNAL February 1988

Journal articles
Open Access
Neutral sulfite-anthraquinone pulping for linerboard: a lower temperature and mild alkalinity approach, TAPPI JOURNAL February 1988 88FEB83

Neutral sulfite-anthraquinone pulping for linerboard: a lower temperature and mild alkalinity approach, TAPPI JOURNAL February 1988

Journal articles
Open Access
Flash X-ray imaging of kraft black liquor sprays, TAPPI JOURNAL February 1988 88FEB89

Flash X-ray imaging of kraft black liquor sprays, TAPPI JOURNAL February 1988

Journal articles
Open Access
The influence of headbox flow conditions on paper properties and their constancy, TAPPI JOURNAL February 1988 88FEB93

The influence of headbox flow conditions on paper properties and their constancy, TAPPI JOURNAL February 1988

Journal articles
Open Access
High-solids black liquor combustion-Tampella's Super Combustion system, TAPPI JOURNAL January 1988 88JAN107

High-solids black liquor combustion-Tampella's Super Combustion system, TAPPI JOURNAL January 1988

Journal articles
Magazine articles
Open Access
Numerical analysis of the impact of rotor and screen hole plate design on the performance of a vertical pulper, TAPPI Journal April 2025

ABSTRACT: The dissolving of mechanical pulp is one of the most important process steps in stock preparation, since pulping occurs at the very beginning of the papermaking process. Efficient mixing of the pulp in a short amount of time is essential to achieve high furnish volume flow rates. The design of the rotor, as well as the pulper vat and inserts, significantly affects the overall performance of the pulper, such as mixing efficiency and power demand. Using advanced numerical methods such as computational fluid dynamics (CFD) can accelerate the development process. The CFD simulations allow for detailed analysis of flow phenomena, making it possible to study a real-size machine numerically. This approach is particularly advantageous because it can reduce the need for timeconsuming and costly experiments associated with scaling up test rigs. In this study, we compared two different rotor designs utilized in a vertical pulper and evaluated the numerical results with experimental data. Rotor A is designed for low turbulence and low power demand, while rotor B is designed for high turbulence with high power demand. The CFD results showed good agreement with the experimental measurements. We investigated how the rotor design influences the free fluid surface and the mixing efficiency. Our study also highlights the differences in results depending on whether water or furnish is simulated, which exhibit Newtonian or, respectively, non-Newtonian fluid behavior. Additionally, a detailed numerical investigation of various screen hole plate designs revealed that the newly developed hole design significantly reduces pressure loss compared to a standard drilled hole. This outcome was consistent for both types of fluids investigated: water and furnish.

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