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Journal article
Dilute Polymer Droplets Show Generalized Wetting Dynamics via an Average Viscosity
ACS applied polymer materials, v 6(19), pp 11997-12006
24 Sep 2024
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Abstract
Despite the prevalence of non-Newtonian fluids in various practical applications, comprehensive dynamic wetting models are lacking. Existing models often oversimplify complex rheological behavior, limiting our ability to predict wetting dynamics. This work introduces and experimentally validates a generalized model for the dynamic wetting of non-Newtonian shear-thinning fluids (dilute polymer solutions) on solid substrates. We experimentally analyzed 12 different shear-thinning fluids using both a power-law model and Carreau–Yasuda model. The data clearly show that the dynamic contact angle can be generalized using an average viscosity to capture rheological changes during droplet spreading. The average viscosity was defined using the fluid’s constitutive model over shear rates relevant to the spreading process. Using a small droplet approximation, we propose and validate a semianalytical spreading model to predict the basal radius of non-Newtonian droplets. The model agrees well with the experimental data. Additionally, the average viscosity was used to define a spreading time scale, which is capable of collapsing the spreading of different non-Newtonian fluids onto a master spreading curve. This work offers significant potential for predicting the dynamic shape and spreading of non-Newtonian fluids with complex rheologies in a range of applications and industrial processes.
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Details
- Title
- Dilute Polymer Droplets Show Generalized Wetting Dynamics via an Average Viscosity
- Creators
- Nicolas J Alvarez (Corresponding Author) - Drexel University, Chemical and Biological EngineeringAmir Azimi YancheshmeHeedong Yoon - Drexel University, Chemical and Biological EngineeringGiuseppe Raffaello Palmese - Drexel University, Chemical and Biological Engineering
- Publication Details
- ACS applied polymer materials, v 6(19), pp 11997-12006
- Publisher
- ACS Publications
- Number of pages
- 10
- Grant note
- Army Research Laboratory: W911NF-17-2- 0227 National Science Foundation: CBET-1847140
Research was sponsored by the Army Research Laboratory and was accomplished under Cooperative Agreement Number W911NF-17-2- 0227. The views and conclusions contained in this document are those of the authors and should not be interpreted as representing the official policies, either expressed or implied, of the Army Research Laboratory or the U.S. Government. The U.S. Government is authorized to reproduce and distribute reprints for government purposes not withstanding any copyright notation herein. NJA was also supported by the National Science Foundation under grant no. CBET-1847140.
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Chemical and Biological Engineering
- Web of Science ID
- WOS:001319855900001
- Scopus ID
- 2-s2.0-85205908597
- Other Identifier
- 991021903709104721
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InCites Highlights
Data related to this publication, from InCites Benchmarking & Analytics tool:
- Web of Science research areas
- Materials Science, Multidisciplinary
- Polymer Science