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Journal articles
Open Access
Improving Softwood Mechanical Pulp Properties with Ophiostom

Improving Softwood Mechanical Pulp Properties with Ophiostoma Piliferum, 1995 Pulping Conference Proceedings

Journal articles
Open Access
Xylanase Treatment for the Bleaching of Softwood Kraft Pulps

Xylanase Treatment for the Bleaching of Softwood Kraft Pulps: The Effect of Chlorine Dioxide Substitution, 1992 Pulping Conference Proceedings

Journal articles
Open Access
AOX Content of Paper Manufactured with 'Chlorine Free' Pulps

AOX Content of Paper Manufactured with 'Chlorine Free' Pulps, 1995 Papermakers Conference Proceedings

Journal articles
Open Access
Pressure drop characteristics of steam condensation flow in triangular channels for multi-channel cylinder dryers, TAPPI Journal September 2026

ABSTRACT: This study investigates the condensation pressure drop characteristics of steam in the channels of multi-channel drying cylinders, which remain insufficiently understood. An experimental system was established using a horizontal mini-channel with a triangular cross-section and a hydraulic diameter of 4.09 mm. Flow visualization combined with a high-precision data acquisition system was employed to systematically examine the effects of steam mass flux (10•60 kg/(m²·s)), inlet temperature (110°C•140°C), and cooling water flow rate (100•500 kg/h) on the frictional pressure drop during condensation. The results indicate that the two-phase frictional pressure drop increases with rising steam mass flux but decreases with increasing saturation temperature, while the effect of cooling water flow rate becomes more pronounced under lower temperature conditions. In addition, several existing two-phase flow pressure drop correlations were evaluated against the experimental data. Based on a comparative assessment of eight existing correlations, a new predictive model was developed through regression analysis, achieving a mean absolute percentage error (MAPE) of 19.56%. These findings elucidate the pressure drop mechanism of steam condensation in triangular channels and establish a high-precision predictive model, providing theoretical guidance and a critical tool for the engineering design and energy consumption optimization of multi-channel drying cylinders.

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