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Journal articles
Development of waterborne laminating adhesive systems, June 1988, TAPPI Journal 88JUN145
Development of waterborne laminating adhesive systems, TAPPI JOURNAL June 1988
Journal articles
Formulating to enhance the radiation cross linking of thermoplastic rubber for the hot-melt pressure-senstivie adhesives, June 1988, TAPPI Journal 88JUN155
Formulating to enhance the radiation crosslinking of thermoplastic rubber for hot-melt pressure-sensitive adhesives, TAPPI JOURNAL June 1988
Journal articles
Fiber flocculation in pulp suspension flow-Part 2: Experimental results, TAPPI JOURNAL June 1988
Fiber flocculation in pulp suspension flow-Part 2: Experimental results, TAPPI JOURNAL June 1988
Journal articles
Improved control of drum level for boilers with "shrink" and "swell" problems, June 1988, TAPPI Journal 88JUN65
Improved control of drum level for boilers with "shrink" and "swell" problems, TAPPI JOURNAL June 1988
Journal articles
The resistance of refiner plate alloys to bar rounding, July 1988, TAPPI Journal 88JUN95
The resistance of refiner plate alloys to bar rounding, TAPPI JOURNAL June 1988
Journal articles
Upgrading wood chips: the Paprifer process, TAPPI JOURNAL March 1988
Upgrading wood chips: the Paprifer process, TAPPI JOURNAL March 1988
Journal articles
Optimization of a swirl burner for pulverized-wood fuels, TAPPI JOURNAL May 1988 88MAY91
Optimization of a swirl burner for pulverized-wood fuels, TAPPI JOURNAL May 1988
Journal articles
On-line layer discrimination of multilayer materials, TAPPI JOURNAL May 1988 88MAY97
On-line layer discrimination of multilayer materials, TAPPI JOURNAL May 1988
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.
Journal articles
Materials performance considerations in hydrothermal liquefaction conversion of biomass, TAPPI Journal June 2025
ABSTRACT: Hydrothermal liquefaction (HTL) is a promising thermochemical route developed to convert woody biomass and biowaste to biochemicals and bio-oils. However, the operating conditions are rather harsh to biorefinery structural metallic components. These conditions include alkaline catalysts such as potassium carbonate (K2CO3); hot, pressurized (sub-critical) water reaction; and medium and aggressive anions chlorine (Cl•) and hydrogen sulfide (H•) released from biomass feedstocks. Thus, selection of suitable structural alloys for biorefinery components involves striking a balance between mechanical properties, corrosion resistance, and cost. Alloys currently being considered for this application include ferritic-martensitic steels and austenitic stainless steels. From a corrosion perspective in hot pressurized water, the former typically exhibits higher stress corrosion cracking resistance, whereas the latter exhibits higher corrosion resistance. This study reviews cost-effective corrosion control strategies aimed at increasing the chromium (Cr) content for protective surface oxide formation, as screened by testing in simulated HTL alkaline water, to support materials selection and design. Corrosion control strategies include surface modification (increasing surface Cr content), alloying (increasing bulk Cr content), and stainless-steel type (ferritic vs. austenitic). Of the alloys considered (including those subjected to surface modification), ferritic stainless steels exhibit a promising balance between corrosion and stress corrosion cracking resistance, adding another family of candidate alloys for structural biorefinery component materials selection and design.