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Magazine articles
Influence of tube metallurgy on corrosion resistance of liquor heaters, TAPPI JOURNAL, March 1991, Vol. 74(3)
Influence of tube metallurgy on corrosion resistance of liquor heaters, TAPPI JOURNAL, March 1991, Vol. 74(3)
Magazine articles
Ozone wasn't the whole story at the 1994 international pulp bleaching conference, TAPPI JOURNAL, November 1994, Vol. 77(11)
Ozone wasn't the whole story at the 1994 international pulp bleaching conference, TAPPI JOURNAL, November 1994, Vol. 77(11)
Magazine articles
Chemical recovery conference emphasizes high solids firing and mill system closure, TAPPI JOURNAL, August 1995, Vol. 78(8)
Chemical recovery conference emphasizes high solids firing and mill system closure, TAPPI JOURNAL, August 1995, Vol. 78(8)
Magazine articles
Drying: New lime mud dryer kiln helps James Riverâ??s Pennington, AL, mill meet environmental restrictions, December 1995 Tappi Journal [95Dec37.pdf]
New lime mud dryer kiln helps james river's pennington, al, mill meet environmental restrictions, TAPPI JOURNAL, December 1995, Vol. 78(12)
Magazine articles
ECF results please gruvon mill, TAPPI JOURNAL, January 1995, Vol. 78(1)
ECF results please gruvon mill, TAPPI JOURNAL, January 1995, Vol. 78(1)
Magazine articles
The corrosion behavior of titanium (grade 2) in alkaline peroxide bleach liquors, TAPPI JOURNAL, June 1995, Vol. 78(6)
The corrosion behavior of titanium (grade 2) in alkaline peroxide bleach liquors, TAPPI JOURNAL, June 1995, Vol. 78(6)
Magazine articles
Nonchlorine bleaching conference: the future is here, TAPPI JOURNAL, July 1992, Vol. 75(7)
Nonchlorine bleaching conference: the future is here, TAPPI JOURNAL, July 1992, Vol. 75(7)
Magazine articles
Capital cost analysis looks at recent and future trends, TAPPI JOURNAL, November 1992, Vol. 75(11)
Capital cost analysis looks at recent and future trends, TAPPI JOURNAL, November 1992, Vol. 75(11)
Magazine articles
Setting a limit, TAPPI JOURNAL, July 2002, Vol. 1(5) (52KB)
Setting a limit, TAPPI JOURNAL, July 2002, Vol. 1(5) (52KB)
Journal articles
Magazine articles
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.