Optimized Cross-Slot Flow Geometry for Microfluidic Extensional Rheometry
A precision-machined cross-slot flow geometry with a shape that has been optimized by numerical simulation of the fluid kinematics is fabricated and used to measure the extensional viscosity of a dilute polymer solution. Full-field birefringence microscopy is used to monitor the evolution and growth...
| Main Authors: | , , , |
|---|---|
| Other Authors: | |
| Format: | Article |
| Language: | en_US |
| Published: |
American Physical Society
2013
|
| Online Access: | http://hdl.handle.net/1721.1/79062 https://orcid.org/0000-0001-8323-2779 |
| _version_ | 1826198041157173248 |
|---|---|
| author | Haward, Simon J. Alves, Manuel A. McKinley, Gareth H. Oliveira, Monica S. N. |
| author2 | Massachusetts Institute of Technology. Department of Mechanical Engineering |
| author_facet | Massachusetts Institute of Technology. Department of Mechanical Engineering Haward, Simon J. Alves, Manuel A. McKinley, Gareth H. Oliveira, Monica S. N. |
| author_sort | Haward, Simon J. |
| collection | MIT |
| description | A precision-machined cross-slot flow geometry with a shape that has been optimized by numerical simulation of the fluid kinematics is fabricated and used to measure the extensional viscosity of a dilute polymer solution. Full-field birefringence microscopy is used to monitor the evolution and growth of macromolecular anisotropy along the stagnation point streamline, and we observe the formation of a strong and uniform birefringent strand when the dimensionless flow strength exceeds a critical Weissenberg number Wi[subscript crit]≈0.5. Birefringence and bulk pressure drop measurements provide self-consistent estimates of the planar extensional viscosity of the fluid over a wide range of deformation rates (26 s[superscript -1]≤ε˙≤435 s[superscript -1]) and are also in close agreement with numerical simulations performed by using a finitely extensible nonlinear elastic dumbbell model. |
| first_indexed | 2024-09-23T10:57:55Z |
| format | Article |
| id | mit-1721.1/79062 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T10:57:55Z |
| publishDate | 2013 |
| publisher | American Physical Society |
| record_format | dspace |
| spelling | mit-1721.1/790622022-10-01T00:14:45Z Optimized Cross-Slot Flow Geometry for Microfluidic Extensional Rheometry Haward, Simon J. Alves, Manuel A. McKinley, Gareth H. Oliveira, Monica S. N. Massachusetts Institute of Technology. Department of Mechanical Engineering Haward, Simon J. McKinley, Gareth H. A precision-machined cross-slot flow geometry with a shape that has been optimized by numerical simulation of the fluid kinematics is fabricated and used to measure the extensional viscosity of a dilute polymer solution. Full-field birefringence microscopy is used to monitor the evolution and growth of macromolecular anisotropy along the stagnation point streamline, and we observe the formation of a strong and uniform birefringent strand when the dimensionless flow strength exceeds a critical Weissenberg number Wi[subscript crit]≈0.5. Birefringence and bulk pressure drop measurements provide self-consistent estimates of the planar extensional viscosity of the fluid over a wide range of deformation rates (26 s[superscript -1]≤ε˙≤435 s[superscript -1]) and are also in close agreement with numerical simulations performed by using a finitely extensible nonlinear elastic dumbbell model. NASA Microgravity Fluid Sciences (Grant NNX09AV99G) 2013-06-05T18:36:25Z 2013-06-05T18:36:25Z 2012-09 2012-05 Article http://purl.org/eprint/type/JournalArticle 0031-9007 1079-7114 http://hdl.handle.net/1721.1/79062 Haward, Simon J. et al. “Optimized Cross-Slot Flow Geometry for Microfluidic Extensional Rheometry.” Physical Review Letters 109.12 (2012). © 2012 American Physical Society https://orcid.org/0000-0001-8323-2779 en_US http://dx.doi.org/10.1103/PhysRevLett.109.128301 Physical Review Letters Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. application/pdf American Physical Society APS |
| spellingShingle | Haward, Simon J. Alves, Manuel A. McKinley, Gareth H. Oliveira, Monica S. N. Optimized Cross-Slot Flow Geometry for Microfluidic Extensional Rheometry |
| title | Optimized Cross-Slot Flow Geometry for Microfluidic Extensional Rheometry |
| title_full | Optimized Cross-Slot Flow Geometry for Microfluidic Extensional Rheometry |
| title_fullStr | Optimized Cross-Slot Flow Geometry for Microfluidic Extensional Rheometry |
| title_full_unstemmed | Optimized Cross-Slot Flow Geometry for Microfluidic Extensional Rheometry |
| title_short | Optimized Cross-Slot Flow Geometry for Microfluidic Extensional Rheometry |
| title_sort | optimized cross slot flow geometry for microfluidic extensional rheometry |
| url | http://hdl.handle.net/1721.1/79062 https://orcid.org/0000-0001-8323-2779 |
| work_keys_str_mv | AT hawardsimonj optimizedcrossslotflowgeometryformicrofluidicextensionalrheometry AT alvesmanuela optimizedcrossslotflowgeometryformicrofluidicextensionalrheometry AT mckinleygarethh optimizedcrossslotflowgeometryformicrofluidicextensionalrheometry AT oliveiramonicasn optimizedcrossslotflowgeometryformicrofluidicextensionalrheometry |