Abstract
This work explores the application of the Marangoni effect in micro systems involving small gas or vapor bubbles in a liquid environment subjected to a temperature gradient. The Marangoni effect characterizes the variation of surface tension along the bubble surface resulting from the temperature gradient around the bubble, thus driving the bubble toward the higher temperature region. This phenomenon is more pronounced as the bubble becomes smaller and the temperature gradient becomes steeper, both of which can be achieved in microbubble systems. Potential applications based on the Marangoni effect include linear bubble actuators, dynamic microvalves, and hot-spot locators. The optimum bubble size for these applications is expected to be of the order of 10 μ m. A smaller bubble may be difficult to introduce into the working system and maintain its size. Presented for illustration is a feasibility analysis for both a noncondensable gas bubble and a vapor bubble situated above a microheater. The analysis yields results for the temperature field around the bubble surface and the Marangoni driving pressure, which is a key element of the performance evaluation for all Marangoni-effect-based applications. The findings demonstrate clearly that the Marangoni effect on microbubbles is very significant and shows great promise for applications in microelectromechanical systems (MEMS).
| Original language | English |
|---|---|
| Pages (from-to) | 169-182 |
| Number of pages | 14 |
| Journal | Microscale Thermophysical Engineering |
| Volume | 3 |
| Issue number | 3 |
| DOIs | |
| Publication status | Published - Aug 1 1999 |
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All Science Journal Classification (ASJC) codes
- Atomic and Molecular Physics, and Optics
- Materials Science (miscellaneous)
- Materials Science(all)
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering
- Physics and Astronomy (miscellaneous)
Cite this
Marangoni effect in microbubble systems. / Takahashi, Koji; Weng, Jian Gang; Tien, Chang Lin.
In: Microscale Thermophysical Engineering, Vol. 3, No. 3, 01.08.1999, p. 169-182.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Marangoni effect in microbubble systems
AU - Takahashi, Koji
AU - Weng, Jian Gang
AU - Tien, Chang Lin
PY - 1999/8/1
Y1 - 1999/8/1
N2 - This work explores the application of the Marangoni effect in micro systems involving small gas or vapor bubbles in a liquid environment subjected to a temperature gradient. The Marangoni effect characterizes the variation of surface tension along the bubble surface resulting from the temperature gradient around the bubble, thus driving the bubble toward the higher temperature region. This phenomenon is more pronounced as the bubble becomes smaller and the temperature gradient becomes steeper, both of which can be achieved in microbubble systems. Potential applications based on the Marangoni effect include linear bubble actuators, dynamic microvalves, and hot-spot locators. The optimum bubble size for these applications is expected to be of the order of 10 μ m. A smaller bubble may be difficult to introduce into the working system and maintain its size. Presented for illustration is a feasibility analysis for both a noncondensable gas bubble and a vapor bubble situated above a microheater. The analysis yields results for the temperature field around the bubble surface and the Marangoni driving pressure, which is a key element of the performance evaluation for all Marangoni-effect-based applications. The findings demonstrate clearly that the Marangoni effect on microbubbles is very significant and shows great promise for applications in microelectromechanical systems (MEMS).
AB - This work explores the application of the Marangoni effect in micro systems involving small gas or vapor bubbles in a liquid environment subjected to a temperature gradient. The Marangoni effect characterizes the variation of surface tension along the bubble surface resulting from the temperature gradient around the bubble, thus driving the bubble toward the higher temperature region. This phenomenon is more pronounced as the bubble becomes smaller and the temperature gradient becomes steeper, both of which can be achieved in microbubble systems. Potential applications based on the Marangoni effect include linear bubble actuators, dynamic microvalves, and hot-spot locators. The optimum bubble size for these applications is expected to be of the order of 10 μ m. A smaller bubble may be difficult to introduce into the working system and maintain its size. Presented for illustration is a feasibility analysis for both a noncondensable gas bubble and a vapor bubble situated above a microheater. The analysis yields results for the temperature field around the bubble surface and the Marangoni driving pressure, which is a key element of the performance evaluation for all Marangoni-effect-based applications. The findings demonstrate clearly that the Marangoni effect on microbubbles is very significant and shows great promise for applications in microelectromechanical systems (MEMS).
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U2 - 10.1080/108939599199729
DO - 10.1080/108939599199729
M3 - Article
AN - SCOPUS:0033245363
VL - 3
SP - 169
EP - 182
JO - Nanoscale and Microscale Thermophysical Engineering
JF - Nanoscale and Microscale Thermophysical Engineering
SN - 1089-3954
IS - 3
ER -