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58,80 €
ISBN 978-3-8191-0565-4
Paperback
156 Seiten
33 Abbildungen
215 g
21 x 14,8 cm
Englisch
Dissertation
März 2026
Iris Ramaj
Modelling and experimental validation of drying kinetics, airflow resistance, and compaction behaviour of wheat grain beds (Triticum aestivum L., cv. ‘Pionier’)
Wheat constitutes one of the most significant cereal crops worldwide, serving as a dietary staple for a substantial portion of the global population. However, once harvested, wheat is highly susceptible to quality deterioration, rendering post-harvest drying and storage essential for maintaining its quality and availability. Conventional drying methods commonly employ high temperatures, which can adversely affect grain quality. Therefore, low-temperature drying emerges as a viable alternative. While airflow resistance in stored grain has been widely researched, the impact of self-compaction has been largely overlooked. The assumption of a homogeneous and isotropic grain bulk can lead to inaccurate predictions. Since bulk compaction is governed by the mechanics of individual kernels, an accurate analysis requires discrete particle modelling instead of continuum-based approaches. Therefore, to address these issues, this thesis was structured into three steps: the investigation of the drying behaviour of wheat at low temperatures, the assessment of the effect of self-compaction on airflow resistance, and the analysis of the bulk mechanical response to compaction. The results of this thesis provide valuable insights into the influence of drying parameters and compaction on drying behaviour, airflow resistance, and bulk properties for the design, analysis, and optimisation of drying and storage systems for wheat bulks. The models developed herein offer reliable and practical predictive tools for post-harvest applications. Their applicability can be extended to large-scale practical conditions, with potential integration into decision-support systems to enhance the energy efficiency and operational reliability of wheat post-harvest systems.
Schlagwörter: Airflow resistance; CAD; Calibration; Compression; Discrete Element Method; Drying kinetics; Grain storage; Low-temperature drying; Mathematical modelling; Particle shape; Physical and mechanical properties; Pore volume dynamics; Self-compaction
Schriftenreihe des Lehrstuhls für Agrartechnik in den Tropen und Subtropen der Universität Hohenheim
Herausgegeben von Prof. Dr. Joachim Müller, Stuttgart
Band 38,2026
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Elektronische Publikation (PDF): 978-3-8191-0615-6
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