Sebastian Gruber
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View article: X-ray micro computed tomography investigation of microstructure and its relations with physicochemical properties of heterogeneous food product during hot air drying
X-ray micro computed tomography investigation of microstructure and its relations with physicochemical properties of heterogeneous food product during hot air drying Open
View article: Convergence of Digital Twins and food drying technology: How to bring the next generation of dryers to life!?
Convergence of Digital Twins and food drying technology: How to bring the next generation of dryers to life!? Open
23 pages, 5 tables, 1 figure
View article: Pore-scale study of coupled heat and mass transfer during primary freeze-drying using an irregular pore network model
Pore-scale study of coupled heat and mass transfer during primary freeze-drying using an irregular pore network model Open
View article: Design of a pilot-scale microwave freeze dryer for <i>in situ</i> neutron imaging
Design of a pilot-scale microwave freeze dryer for <i>in situ</i> neutron imaging Open
The gentle yet cost-effective drying of sensitive products in the food and pharmaceutical industries is becoming increasingly important. To maintain sensitive ingredients, color, structure, and viability of micro-organisms, often freeze-dr…
View article: Pore shape matters – In-situ investigation of freeze-drying kinetics by 4D XCT methods
Pore shape matters – In-situ investigation of freeze-drying kinetics by 4D XCT methods Open
Freeze-drying is a commonly employed method in the food industry to extend shelf life of products. However, this process remains time and energy consuming. While higher shelf temperatures accelerate the process, they also pose the risk of …
View article: A Non-Isothermal Pore Network Model of Primary Freeze Drying
A Non-Isothermal Pore Network Model of Primary Freeze Drying Open
In this work, a non-isothermal pore network (PN) model with quasi-steady vapor transport and transient heat transfer is presented for the first time for the application of primary freeze drying. The pore-scale resolved model is physically …
View article: The Influence of Local Microstructure Inhomogeneities on Local Drying Kinetics during Freeze-Drying
The Influence of Local Microstructure Inhomogeneities on Local Drying Kinetics during Freeze-Drying Open
Freeze-drying is a gentle drying technique to dry high value products, such as pharmaceuticals, without impacting the quality of the product. However, this method is very time and cost intensive. It is known that larger pores reduce the du…
View article: Evaluation of methods to represent the structure in tomographic images of freeze-dried porous media
Evaluation of methods to represent the structure in tomographic images of freeze-dried porous media Open
Morphological image processing is used to translate the structural information from X-ray microtomography scans of porous freeze dried maltodextrin into a 3-dimensional (3D) pore network.The purpose is to conduct pore network simulations o…
View article: Experimental Study of the Impact of Pore Structure on Drying Kinetics and Sublimation Front Patterns
Experimental Study of the Impact of Pore Structure on Drying Kinetics and Sublimation Front Patterns Open
Freeze-drying frozen maltodextrin solutions with solid contents of 5% and 30% (w/w) was experimentally investigated using neutron imaging at PSI Villigen/Switzerland. Different solid contents, as well as annealing at −5 °C for 11 h, were u…
View article: Freeze-Drying with Structured Sublimation Fronts—Visualization with Neutron Imaging
Freeze-Drying with Structured Sublimation Fronts—Visualization with Neutron Imaging Open
The particular structure of the sublimation front in vacuum freeze-drying of porous media is, in most situations, not accessible at the pore scale. The classical measurement techniques access the process only globally. Knowledge about the …
View article: Development of a Freeze-Drying Stage for In-Situ µ-CT Measurements
Development of a Freeze-Drying Stage for In-Situ µ-CT Measurements Open
This paper shows the development of a freeze-drying stage for in-situ μ-CT measurements. The stage can operate in a temperature range of −40 °C up to 70 °C, and a pressure range from atmospheric pressure to 7 Pa at the sample holder. To ge…
View article: Characterization of Lyophilization of Frozen Bulky Solids
Characterization of Lyophilization of Frozen Bulky Solids Open
Two methods to study the primary freeze‐drying behavior of bulky solids are presented, namely, lyomicroscopy and neutron imaging. The applicability of both methods to visualize the evolution of the sublimation front is tested for maltodext…
View article: Estimation of the local sublimation front velocities from neutron radiography and tomography of particulate matter
Estimation of the local sublimation front velocities from neutron radiography and tomography of particulate matter Open
View article: Sublimation front structures in lyophilization of frozen particle packings: estimates from neutron
Sublimation front structures in lyophilization of frozen particle packings: estimates from neutron Open
View article: Visualization and replay memory database design for reinforcement learning in R
Visualization and replay memory database design for reinforcement learning in R Open