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Universality in the buckling behavior of drying suspension drops
Om Prakash Bamboriya1, Mahesh S Tirumkudulu1
1Department of Chemical Engineering, Indian Institute of Technology Bombay, Powai, Mumbai, 400076, India. mahesh@che.iitb.ac.in.
Soft Matter
|March 22, 2023
Summary
Researchers discovered a universal scaling law for buckling in drying particle suspensions. This finding helps control granule morphology in spray drying, preventing defects like buckling and cracking.
Area of Science:
- Materials Science
- Fluid Dynamics
- Chemical Engineering
Background:
- Fast evaporation of particle suspensions leads to complex granule morphologies.
- Understanding these transformations is crucial for industrial processes like spray drying, especially for thermally sensitive materials.
Purpose of the Study:
- To elucidate the universal scaling law governing the buckling of particle-packed shells during droplet evaporation.
- To identify the key parameters influencing granule morphology and develop strategies for controlling it.
Main Methods:
- Investigated the buckling phenomenon in drying particle-suspension drops.
- Developed a dimensionless number to characterize the critical transition for buckling.
- Correlated buckling with particle size, hardness, packing, and droplet size.
Main Results:
- Demonstrated a universal scaling law for buckling dependent on particle and drop characteristics.
- Identified a dimensionless number that predicts buckling and cracking.
- Showcased the universality of mechanical behavior in solvent-saturated particle packings.
Conclusions:
- The findings enable the design of defect-free granules with controlled hierarchical structures.
- This research provides insights into preventing buckling and cracking in spray-dried materials.
- The universal scaling law offers a predictive tool for optimizing granule formation in industrial applications.
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