scholarly journals Process Design of a Multistage Drying Process via Flowsheet Simulation

2021 ◽  
Author(s):  
Moritz Buchholz ◽  
Johannes Haus ◽  
Lukas Blesinger ◽  
Christian Riemann ◽  
Swantje Pietsch ◽  
...  
Keyword(s):  
Process Design ◽  
Drying Process ◽  
Flowsheet Simulation

Choked flow and importance of Mach I in freeze-drying process design

2010 ◽  
Vol 65 (21) ◽  
pp. 5716-5727 ◽  
Author(s):  
Sajal M. Patel ◽  
Swetaprovo Chaudhuri ◽  
Michael J. Pikal
Keyword(s):  
Process Design ◽  
Freeze Drying ◽  
Drying Process ◽  
Choked Flow

scholarly journals Achieving Control of Coating Process in your Foundry

2015 ◽  
Vol 15 (4) ◽  
pp. 110-114 ◽  
Author(s):  
G.L. Di Muoio ◽  
N.S. Tiedje
Keyword(s):  
Process Design ◽  
Coating Layer ◽  
Coating Process ◽  
Drying Process ◽  
Process Stability ◽  
Drying Time ◽  
Linear Effects ◽  
Simple Linear Equation ◽  
Coating Layer Thickness ◽  
Dipping Time

Abstract Achieving control of coating thickness in foundry moulds is needed in order to guarantee uniform properties of the mould but also to achieve control of drying time. Since drying time of water based coatings is heavily dependent on the amount of water present in the coating layer, a stable coating process is prerequisite for a stable drying process. In this study, we analyse the effect of different variables on the coating layer properties. We start by considering four critical variables identified in a previous study such as sand compaction, coating density, dipping time and gravity and then we add centre points to the original experimental plans to identify possible non-linear effects and variation in process stability. Finally, we investigate the relation between coating penetration (a variable that is relatively simple to measure in production) and other coating layer thickness properties (relevant for the drying process design). Correlations are found and equations are provided. In particular it is found that water thickness can be directly correlated to penetration with a simple linear equation and without the need to account for other variables.

scholarly journals Modeling and Flowsheet Simulation of Vibrated Fluidized Bed Dryers

Processes ◽  
2020 ◽  
Vol 9 (1) ◽  
pp. 52
Author(s):  
Soeren E. Lehmann ◽  
Moritz Buchholz ◽  
Alfred Jongsma ◽  
Fredrik Innings ◽  
Stefan Heinrich
Keyword(s):  
Fluidized Bed ◽  
Mechanical Vibration ◽  
Hydrodynamic Characteristics ◽  
Drying Process ◽  
Particle Properties ◽  
Flowsheet Simulation ◽  
Wide Range ◽  
Vibrated Fluidized Bed ◽  
Geldart Groups ◽  
The Impact

Drying in fluidized beds is an important step in the production of powdered materials. Especially in the food and pharmaceutical industry, fluidized bed dryers are often vibrated to improve the drying process. In the current work, a continuous fluidized bed drying model is implemented in the novel, open-source flowsheet simulation framework Dyssol. The new model accounts for the hydrodynamic characteristics of all Geldart groups as well as the impact of mechanical vibration on the drying process. Distributed particle properties are considered by the model. Comprehensive validation of the model was conducted for a wide range of process parameters, different materials, dryer geometries and dimensions as well as the impact of vibration. Particle properties are predicted accurately and represent the broad experimental data well. A sensitivity analysis of the model confirmed grid independence and the validity of underlying model assumptions.

The Effect of Dryer Load on Freeze Drying Process Design

2010 ◽  
Vol 99 (10) ◽  
pp. 4363-4379 ◽  
Author(s):  
Sajal M. Patel ◽  
Feroz Jameel ◽  
Michael J. Pikal
Keyword(s):  
Process Design ◽  
Freeze Drying ◽  
Drying Process

scholarly journals Critical Solutal Marangoni Number Correlation for Short-Scale Convective Instabilities in Drying Poly(vinyl acetate)-Methanol Thin Films

Polymers ◽  
2021 ◽  
Vol 13 (17) ◽  
pp. 2955
Author(s):  
Max Tönsmann ◽  
Philip Scharfer ◽  
Wilhelm Schabel
Keyword(s):  
Thin Films ◽  
Vinyl Acetate ◽  
Process Design ◽  
Self Assembly ◽  
Marangoni Number ◽  
Drying Process ◽  
Short Scale ◽  
Convective Instabilities ◽  
Schmidt Numbers ◽  
Dry Film

A new empiric correlation for the critical solutal Marangoni number as function of the Péclet and Schmidt numbers is proposed. It is based on previously published experimental flow field data in drying poly(vinyl acetate)-methanol films with an initial thickness in the range of – and an initial solvent load of to , as well as newly derived concentration profile measurements and 1D drying simulations. The analysis accounts for realistic transient material properties and describes the occurrence of short-scale convective Marangoni (in)stabilities during the entire drying process with an accuracy of 9%. In addition, the proposed correlation qualitatively follows trends known from theory. As convective Marangoni instabilities in drying polymer films may induce surface deformations, which persist in the dry film, the correlation may facilitate future process design for either thin films with uniform thickness or deliberate self-assembly.

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