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The Study of Temperature Rise in a 90-Degree Sharp Bend Microchannel Flow Under Constant Wall Temperature Condition

Published online by Cambridge University Press:  05 September 2014

C.-Y. Huang ,
C.-A. Li ,
B.-H. Huang  and
T.-M. Liou
C.-Y. Huang*
Affiliation:
Department of Power Mechanical Engineering, National Tsing Hua University, Hsinchu, Taiwan
C.-A. Li
Affiliation:
Department of Power Mechanical Engineering, National Tsing Hua University, Hsinchu, Taiwan
B.-H. Huang
Affiliation:
Department of Power Mechanical Engineering, National Tsing Hua University, Hsinchu, Taiwan
T.-M. Liou
Affiliation:
Department of Power Mechanical Engineering, National Tsing Hua University, Hsinchu, Taiwan
*
*[email protected]
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Abstract

This study presents the fluid temperature measurement at a 90-degree sharp bend inside a microchannel using molecule-based temperature sensor technique. This technique provides both detailed and global information for temperature investigation in microfluidic research. Rhodamine B was selected as the molecule-based temperature probe in the experiment to provide non-invasive and straightforward measurements. To resolve the luminescence deviation in the microscale temperature measurements introduced by the corner structure, in-situ calibration method and pixel-by-pixel correction were applied during the data reduction. The temperature measurement was performed in a 200μm wide, 67μm deep and 2cm long PDMS microchannel with a 90-degree sharp bend at the center. The temperature profile was measured at a Reynolds number of 27.66 using Rhodamine B in DI water while the bottom of channel was heated at 50°C. As revealed by the molecule-based temperature sensor, the temperature variation along the central line increased 2°C while passing the corner. Additionally, the lateral temperature distributions upstream of the corner show the temperature increase near the outer side of microchannel and decreased near the inner side. The velocity profiles around the 90-degree sharp bend were acquired to analyze the flow after corner. Secondary flow structure after the corner was observed in the velocity profiles along the depth of the microchannel. This study analyzes the thermal flow fields in the microchannel with a 90-degree sharp bend and reveals that regardless of the low Reynolds number, the flow mixing after the corner resulted in the increase of temperature downstream of the bend.

Keywords

Temperature measurements90-degree sharp bendFlow visualizationMolecule-based temperature sensor
Type
Research Article
Information
Journal of Mechanics , Volume 30 , Issue 6 , December 2014 , pp. 661 - 666
Copyright
Copyright © The Society of Theoretical and Applied Mechanics, R.O.C. 2014 

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References

1.Huang, C., Li, C., Wang, H. and Liou, T., “The Application of Temperature-Sensitive Paints for Surface and fluid Temperature Measurements in Both Thermal Developing and Fully Developed Regions of a Microchannel,” Journal of Micromechanics and Microengineering, 23, p. 037001, (2013).CrossRefGoogle Scholar
2.Harms, T. M., Kazmierczak, M. J. and Gerner, F. M., “Developing Convective Heat Transfer in Deep Rectangular Microchannels,” International Journal of Heat and Fluid Flow, 20, pp. 149–157 (1999).Google Scholar
3.Rosaguti, N. R., Fletcher, D. F. and Haynes, B. S., “Laminar Flow and Heat Transfer in a Periodic Serpentine Channel with Semi-Circular Cross-Section,” International Journal of Heat and Mass Transfer, 49, pp. 2912–2923 (2006).Google Scholar
4.Sun, Y. J., Jian, Y. J., Chang, L. and Liu, Q. S., “Thermally Fully Developed Electroosmotic Flow of Power-Law Fluids in a Circular Microchannel,” Journal of Mechanics, 29, pp. 609–616 (2013).Google Scholar
5.Peng, X. F. and Piao, Y., “Characteristics of Fluid Flow and Convection Heat Transfer in Microchannels,” Advances in Fluid Mechanics IV, pp. 85–94 (2002).Google Scholar
6.Gau, C. and Ko, H. S., “Local Heat Transfer Process and Pressure Drop in a Microchannel Integrated with Arrays of Temperature and Pressure Sensors,” Microfluid Nanofluid, 10, pp. 563–577 (2011).Google Scholar
7.Huang, C., Gregory, J., Nagai, H., Asai, K. and Sullivan, J., “Molecular Sensors in Microturbine Measurement,” International Mechanical Engineering Congress & Exposition, Chicago, Illinois, USA (2006).Google Scholar
8.Natrajan, V. K. and Christensen, K. T., “Non-Intrusive Measurements of Convective Heat Transfer in Smooth- and Rough-Wall Microchannels: Laminar Flow,” Experiments in Fluids, 49, pp. 1021–1037 (2010).Google Scholar
9.Fu, R., Xu, B. and Li, D., “Study of the Temperature Field in Microchannels of a PDMS Chip with Embedded Local Heater Using Temperature-Dependent Fluorescent Dye,” International Journal of Thermal Sciences, 45, pp. 841–847 (2006).Google Scholar
10.Samy, R., Glawdel, T. and Ren, C. L., “Method for Microfluidic Whole-Chip Temperature Measurement Using Thin-Film Poly (Dimethylsiloxane) / Rhodamine b,” Analytical Chemistry, 80, pp. 369–375 (2008).Google Scholar
11.Chamarthy, P., Garimella, S. V. and Wereley, S. T., “Measurement of the Temperature Non-Uniformity in a Microchannel Heat Sink Using Microscale Laser-Induced Fluorescence,” International Journal Heat and Mass Transfer, 53, pp. 3275–3283 (2010).Google Scholar
12.Liu, T. and Sullivan, J. P., Pressure and Temperature Sensitive Paints, Springer-Verlag: Berlin, Germany (2004).Google Scholar
13.Huang, C. Y., Lai, C. M. and Li, J. S., “Applications of Pixel-By-Pixel Calibration Method in Microscale Measurements with Pressure-Sensitive Paint,” Journal of Microelectromechanical Systems, 21, pp. 1090–1097 (2012).CrossRefGoogle Scholar
14.Huang, C. Y. and Lai, C. M., “Pressure Measurements with Molecule-Based Pressure Sensors in Straight and Constricted PDMS Microchannels,” Journal of Micromechanics and Microengineering, 22, p.065021 (2012).CrossRefGoogle Scholar
15.Huang, C., Gregory, J. and Sullivan, J., “Microchannel Pressure Measurements Using Molecular Sensors,” Journal of Microelectromechanical Systems, 16, pp. 777–785 (2007).Google Scholar