Surface Tension Flows inside Surfactant-Added Poly(dimethylsiloxane) Microstructures with Velocity-Dependent Contact Angles
Filling of liquid samples is realized in a microfluidic device with applications including analytical systems, biomedical devices, and systems for fundamental research. The filling of a disk-shaped polydimethylsiloxane (PDMS) microchamber by liquid is analyzed with reference to microstructures with...
| Main Authors: | , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2014-03-01
|
| Series: | Micromachines |
| Subjects: | |
| Online Access: | http://www.mdpi.com/2072-666X/5/2/116 |
| _version_ | 1811263269550161920 |
|---|---|
| author | Jyh Jian Chen Shih Chuan Liao Mao Hsun Liu Jenn Der Lin Tsung Sheng Sheu Ming Miao Jr. |
| author_facet | Jyh Jian Chen Shih Chuan Liao Mao Hsun Liu Jenn Der Lin Tsung Sheng Sheu Ming Miao Jr. |
| author_sort | Jyh Jian Chen |
| collection | DOAJ |
| description | Filling of liquid samples is realized in a microfluidic device with applications including analytical systems, biomedical devices, and systems for fundamental research. The filling of a disk-shaped polydimethylsiloxane (PDMS) microchamber by liquid is analyzed with reference to microstructures with inlets and outlets. The microstructures are fabricated using a PDMS molding process with an SU-8 mold. During the filling, the motion of the gas-liquid interface is determined by the competition among inertia, adhesion, and surface tension. A single ramp model with velocity-dependent contact angles is implemented for the accurate calculation of surface tension forces in a three-dimensional volume-of-fluid based model. The effects of the parameters of this functional form are investigated. The influences of non-dimensional parameters, such as the Reynolds number and the Weber number, both determined by the inlet velocity, on the flow characteristics are also examined. An oxygen-plasma-treated PDMS substrate is utilized, and the microstructure is modified to be hydrophilic. Flow experiments are conducted into both hydrophilic and hydrophobic PDMS microstructures. Under a hydrophobic wall condition, numerical simulations with imposed boundary conditions of static and dynamic contact angles can successfully predict the moving of the meniscus compared with experimental measurements. However, for a hydrophilic wall, accurate agreement between numerical and experimental results is obvious as the dynamic contact angles were implemented. |
| first_indexed | 2024-04-12T19:41:43Z |
| format | Article |
| id | doaj.art-182cc663f570478b83c37ec2afdd6d6b |
| institution | Directory Open Access Journal |
| issn | 2072-666X |
| language | English |
| last_indexed | 2024-04-12T19:41:43Z |
| publishDate | 2014-03-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Micromachines |
| spelling | doaj.art-182cc663f570478b83c37ec2afdd6d6b2022-12-22T03:19:03ZengMDPI AGMicromachines2072-666X2014-03-015211613810.3390/mi5020116mi5020116Surface Tension Flows inside Surfactant-Added Poly(dimethylsiloxane) Microstructures with Velocity-Dependent Contact AnglesJyh Jian Chen0Shih Chuan Liao1Mao Hsun Liu2Jenn Der Lin3Tsung Sheng Sheu4Ming Miao Jr.5Department of Biomechatronics Engineering, National Pingtung University of Science and Technology, 1, Shuefu Road, Neipu, Pingtung 91201, TaiwanDepartment of Biomechatronics Engineering, National Pingtung University of Science and Technology, 1, Shuefu Road, Neipu, Pingtung 91201, TaiwanDepartment of Mechanical Engineering, National Chiao Tung University, 1001 University Road, Hsinchu 30010, TaiwanDepartment of Power Mechanical Engineering, National Formosa University, 64, Wunhua Road, Huwei, Yunlin 63201, TaiwanDepartment of Mechanical Engineering, Chinese Military Academy, 1, Weiwu Road, Fengshan, Kaohsiung 83059, TaiwanDepartment of Biomechatronics Engineering, National Pingtung University of Science and Technology, 1, Shuefu Road, Neipu, Pingtung 91201, TaiwanFilling of liquid samples is realized in a microfluidic device with applications including analytical systems, biomedical devices, and systems for fundamental research. The filling of a disk-shaped polydimethylsiloxane (PDMS) microchamber by liquid is analyzed with reference to microstructures with inlets and outlets. The microstructures are fabricated using a PDMS molding process with an SU-8 mold. During the filling, the motion of the gas-liquid interface is determined by the competition among inertia, adhesion, and surface tension. A single ramp model with velocity-dependent contact angles is implemented for the accurate calculation of surface tension forces in a three-dimensional volume-of-fluid based model. The effects of the parameters of this functional form are investigated. The influences of non-dimensional parameters, such as the Reynolds number and the Weber number, both determined by the inlet velocity, on the flow characteristics are also examined. An oxygen-plasma-treated PDMS substrate is utilized, and the microstructure is modified to be hydrophilic. Flow experiments are conducted into both hydrophilic and hydrophobic PDMS microstructures. Under a hydrophobic wall condition, numerical simulations with imposed boundary conditions of static and dynamic contact angles can successfully predict the moving of the meniscus compared with experimental measurements. However, for a hydrophilic wall, accurate agreement between numerical and experimental results is obvious as the dynamic contact angles were implemented.http://www.mdpi.com/2072-666X/5/2/116microfluidicsdynamic contact anglegas-liquid interfacesurface tensionfilling process |
| spellingShingle | Jyh Jian Chen Shih Chuan Liao Mao Hsun Liu Jenn Der Lin Tsung Sheng Sheu Ming Miao Jr. Surface Tension Flows inside Surfactant-Added Poly(dimethylsiloxane) Microstructures with Velocity-Dependent Contact Angles Micromachines microfluidics dynamic contact angle gas-liquid interface surface tension filling process |
| title | Surface Tension Flows inside Surfactant-Added Poly(dimethylsiloxane) Microstructures with Velocity-Dependent Contact Angles |
| title_full | Surface Tension Flows inside Surfactant-Added Poly(dimethylsiloxane) Microstructures with Velocity-Dependent Contact Angles |
| title_fullStr | Surface Tension Flows inside Surfactant-Added Poly(dimethylsiloxane) Microstructures with Velocity-Dependent Contact Angles |
| title_full_unstemmed | Surface Tension Flows inside Surfactant-Added Poly(dimethylsiloxane) Microstructures with Velocity-Dependent Contact Angles |
| title_short | Surface Tension Flows inside Surfactant-Added Poly(dimethylsiloxane) Microstructures with Velocity-Dependent Contact Angles |
| title_sort | surface tension flows inside surfactant added poly dimethylsiloxane microstructures with velocity dependent contact angles |
| topic | microfluidics dynamic contact angle gas-liquid interface surface tension filling process |
| url | http://www.mdpi.com/2072-666X/5/2/116 |
| work_keys_str_mv | AT jyhjianchen surfacetensionflowsinsidesurfactantaddedpolydimethylsiloxanemicrostructureswithvelocitydependentcontactangles AT shihchuanliao surfacetensionflowsinsidesurfactantaddedpolydimethylsiloxanemicrostructureswithvelocitydependentcontactangles AT maohsunliu surfacetensionflowsinsidesurfactantaddedpolydimethylsiloxanemicrostructureswithvelocitydependentcontactangles AT jennderlin surfacetensionflowsinsidesurfactantaddedpolydimethylsiloxanemicrostructureswithvelocitydependentcontactangles AT tsungshengsheu surfacetensionflowsinsidesurfactantaddedpolydimethylsiloxanemicrostructureswithvelocitydependentcontactangles AT mingmiaojr surfacetensionflowsinsidesurfactantaddedpolydimethylsiloxanemicrostructureswithvelocitydependentcontactangles |