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Journal articles
Open Access
3-D Computational Simulation of Paper Handsheet Structure and Prediction of Apparent Density, TAPPI JOURNAL September 2009

3-D Computational Simulation of Paper Handsheet Structure and Prediction of Apparent Density, TAPPI JOURNAL September 2009

Journal articles
Open Access
Decreasing specific energy of thermomechanical pulps from reduction of raw materials variability, TAPPI JOURNAL September 2009

Decreasing specific energy of thermomechanical pulps from reduction of raw materials variability, TAPPI JOURNAL September 2009

Journal articles
Open Access
Retention of PCC and GCC Fillers on Chemical Pulp Fines Surfaces, TAPPI JOURNAL September 2009

Retention of PCC and GCC Fillers on Chemical Pulp Fines Surfaces, TAPPI JOURNAL September 2009

Journal articles
Open Access
Kraft pulping and papermaking properties of hot-water pre-extracted loblolly pine in an integrated forest products biorefinery, TAPPI JOURNAl, July 2008

Kraft pulping and papermaking properties of hot-water pre-extracted loblolly pine in an integrated forest products biorefinery, TAPPI JOURNAl, July 2008

Journal articles
Open Access
Application of sericite to LWC coatings, TAPPI JOURNAL June 2008

Application of sericite to LWC coatings, TAPPI JOURNAL June 2008

Journal articles
Open Access
Smelt spout corrosion in a recovery boiler, TAPPI JOURNAL August 2010

Smelt spout corrosion in a recovery boiler, TAPPI JOURNAL August 2010

Journal articles
Open Access
CFD-Based Modeling of Kraft Char Beds â?¢ Part 1: Char Bed Burning Model, TAPPI JOURNAL February 2010

CFD-Based Modeling of Kraft Char Beds • Part 1: Char Bed Burning Model, TAPPI JOURNAL February 2010

Journal articles
Open Access
A novel approach to quantify spatial coating-layer formation, TAPPI JOURNAL November 2010

A novel approach to quantify spatial coating-layer formation, TAPPI JOURNAL November 2010

Journal articles
Open Access
Experimental and theoretical study of the manifold flow in a curtain coater, TAPPI JOURNAL November 2010

Experimental and theoretical study of the manifold flow in a curtain coater, TAPPI JOURNAL November 2010

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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