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Journal articles
Open Access
An examination of two hybrid top-wire former configurations for producing newsprint, TAPPI JOURNAL, October 2003, Vol. 2(10) (300KB)

An examination of two hybrid top-wire former configurations for producing newsprint, Solutions! & TAPPI JOURNAL, October 2003, Vol. 2(10) (300KB)

Journal articles
Open Access
A new retention aid for the production of SC printing grades: pilot paper machine results, TAPPI JOURNAL, September 2003, Vol. 2(9) (255KB)

A new retention aid for the production of SC printing grades: pilot paper machine results, Solutions! & TAPPI JOURNAL, September 2003, Vol. 2(9) (255KB)

Journal articles
Open Access
Potential of mimosa (albizia julibrissin ) for papermaking, TAPPI JOURNAL, September 2003, Vol. 2(9) (150KB)

Potential of mimosa (albizia julibrissin ) for papermaking, Solutions! & TAPPI JOURNAL, September 2003, Vol. 2(9) (150KB)

Journal articles
Open Access
Comparing the fiber flocculation behavior of several wet-end retention systems, Solutions! & TAPPI JOURNAL, April 2004 (251KB)

Comparing the fiber flocculation behavior of several wet-end retention systems, Solutions! & TAPPI JOURNAL, April 2004 (251KB)

Journal articles
Open Access
Indicators for forecasting "pitch season",TAPPI JOURNAL, December 2002

Indicators for forecasting "pitch season",TAPPI JOURNAL, December 2002

Journal articles
Open Access
Using peel as a measure of paper surface strength, Solutions! & TAPPI JOURNAL, July 2004, Vol. 3(7) (473KB)

Using peel as a measure of paper surface strength, Solutions! & TAPPI JOURNAL, July 2004, Vol. 3(7) (473KB)

Journal articles
Open Access
Rosin sizing under neutral-alkaline papermaking conditions, TAPPI JOURNAL, Online Exclusive, July 2004, Vol. 3(7) (212KB)

Rosin sizing under neutral-alkaline papermaking conditions, TAPPI JOURNAL, Online Exclusive, July 2004, Vol. 3(7) (212KB)

Journal articles
Open Access
Paper structure and printability as controlled by the fibrous elements, Solutions! & TAPPI JOURNAL, June 2004, Vol. 3(6) (528KB)

Paper structure and printability as controlled by the fibrous elements, Solutions! & TAPPI JOURNAL, June 2004, Vol. 3(6) (528KB)

Journal articles
Open Access
Development of a functional filler: swelling sericite, Solutions! & TAPPI JOURNAL, June 2004, Vol. 3(6) (408KB)

Development of a functional filler: swelling sericite, Solutions! & TAPPI JOURNAL, June 2004, Vol. 3(6) (408KB)

Journal articles
Open Access
Nonlinear modeling of batch digester discharge dynamics with rheology-driven hydraulic transport and drainability coupling, TAPPI Journal September 2026

ABSTRACT: Batch digester blowdown constitutes a strongly nonlinear transient transport process governed by the coupled evolution of pulp consistency, slurry density, hydraulic resistance, liquid inventory, and discharge line dynamics. A control-oriented nonlinear formulation is developed by coupling dry fiber and free liquor mass balances with phase volume reconstruction, consistency-dependent hydraulic resistance, channeling and drainability effects, and a power law head flow relationship derived within a lumped hydraulic inertance framework. A fixed-gain PI controller obtained from local linearization is employed as the conventional benchmark, whereas an integral sliding mode controller (SMC) explicitly compensates the nonlinear time-varying hydraulic structure and bounded disturbances. Both strategies are evaluated under identical actuator constraints and sequential perturbations involving opposing head, hydraulic resistance, channeling, drainability, and dilution. Numerical results demonstrate lower rootmean- square error, integral absolute error, and peak flow-tracking error for the SMC, with rapid recovery toward the prescribed sliding boundary layer and improved robustness to variations in the nonlinear flow exponent n. Cumulative electrical energy and batch-specific specific energy consumption remain comparatively similar, indicating that the principal SMC benefit is enhanced hydraulic regulation rather than substantial batch energy reduction. Specific energy consumption is an established metric for energetic assessment of slurry transport. Model-based hydraulic demand, electrical power, and sliding manifold surfaces further characterize the nonlinear operating domain. The resulting framework provides a computational proof-of-concept for modeling and control of transient batch digester discharge systems.

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