International Scientific Journal


This research investigated heat transfer performance and flow characteristics of three polydimethylsiloxane microchannels full of deionised water as a working fluid. A single micropillar, horizontal micropillars, and vertical micropillars along the flow direction were prepared on the microchannels experimentally. Results show that the Nusselt number of microchannels with two horizontal micropillars is 19% higher than that with a single micropillar. The microchannel with two vertical micropillars has the Nusselt number is 29% higher than that with a single micropillar, which shows the best performance on the heat transfer enhancement. Visualization experiments of the flow field were carried out to explore the enhanced mechanism of the heat transfer for microchannels with various micropillar arrangements. When the flow rate is 7 mLpm, the maximum velocities near the single cylinder and the horizontal micro-column are 0.5 m/s and 0.52 m/s. Fluid velocity in a region between two vertical micropillars reaches 0.72 m/s when the flow rate is 7 mLpm. The fluid in the high-speed region is fully mixed around the micropillar, which reduces the stagnation region area down-stream of the vertical micropillar and enhances heat transfer.
PAPER REVISED: 2022-04-03
PAPER ACCEPTED: 2022-04-23
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THERMAL SCIENCE YEAR 2022, VOLUME 26, ISSUE Issue 5, PAGES [4169 - 4178]
  1. Dadvand, A., et al., Enhancement of Heat and Mass Transfer in a Microchannel via Passive Oscillation of a Flexible Vortex Generator, Chemical Energy Science, 207 (2019), Nov., pp. 556-580
  2. Li, J., et al., Experimental Investigation of the Heat Transfer and Flow Characteristics of Microchannels with Microribs, International Journal of Heat and Mass Transfer, 143 (2019), Nov., ID 118482
  3. Ringkai, H., et al., Evolution of Water-in-Oil Droplets in T-Junction Microchannel by Micro-PIV, Ap-plied Sciences-Basel, 11 (2021), 11, pp. 1-15
  4. Vinoth, R., Senthil, K. D., Numerical Study of Inlet Cross-section Effect on Oblique Finned Microchan-nel Heat Sink, Thermal Science, 22 (2018), 6B, pp. 2747-2757
  5. Li, Y., et al., Thermal and Hydraulic Characteristics of Microchannel Heat Sinks with Cavities and Fins Based on Field Synergy and Thermodynamic Analysis, Applied Thermal Engineering, 175 (2020), July, ID 115348
  6. Erp, R., et al., Co-Designing Electronics with Microfluidics for More Sustainable Cooling, Nature, 585 (2020), Sept., pp. 211-216
  7. Akbari, O. A., et al., Investigation of Rib's Height Effect on Heat Transfer and Flow Parameters of Lam-inar Water-Al2O3 Nanofluid in a Rib-microchannel, Applied Mathematics and Computation, 290 (2016), Nov., pp. 135-153
  8. Rezaei, O., et al., The Numerical Investigation of Heat Transfer and Pressure Drop of Turbulent Flow in a Triangular Microchannel, Physica E-Low-Dimensional Systems & Nanostructures, 93 (2017), Sept., pp. 179-189
  9. Boudouh, M., et al., Experimental Investigation of Convective Boiling in Mini-Channels: Cooling Ap-plication of the Proton Exchange Membrane Fuel Cells, Thermal Science, 21 (2017), 1A, pp. 223-232
  10. Wang, R. J., Li, Z. H., Influence on Droplet Formation in the Presence of Nanoparticles in a Microfluid-ic T-junction, Thermal Science, 16 (2012), 5, pp. 1429-1432
  11. Zheng, D., et al., Performance Analysis of a Plate Heat Exchanger Using Various Nanofluids, Interna-tional Journal of Heat and Mass Transfer, 158, Part 1 (2020), Mar., ID 119993
  12. Anwar, M., et al., Numerical Study for Heat Transfer Enhancement Using CuO-water Nanofluids Through Mini-Channel Heat Sinks for Microprocessor Cooling, Thermal Science, 24 (2020), 5A, pp. 2965-2976
  13. Siddiqui, A. M., et al., Evaluation of Nanofluids Performance for Simulated Microprocessor, Thermal Science, 21 (2017), 5, pp. 2227-2236
  14. Wang, J., et al., Effects of Pin Fins and Vortex Generators on Thermal Performance in a Microchannel with Al2O3 Nanofluids, Energy, 239, Part E (2022), Jan., ID 122606
  15. Zheng, D., et al., Analyses of Thermal Performance and Pressure Drop in a Plate Heat Exchanger Filled with Ferrofluids under a Magnetic Field, Fuel, 293 (2021), June, ID 120432
  16. Zhou, F., et al., Experimental and Numerical Studies on Heat Transfer Enhancement of Microchannel Heat Exchanger Embedded with Different Shape Micropillars, Applied Thermal Engineering, 175 (2020), July, ID 115296
  17. Lee, V. Y. S., et al., Flow Boiling Characteristics in Plain and Porous Coated Microchannel Heat Sinks, International Journal of Heat and Mass Transfer, 183, Part B (2022), Feb., ID 122152
  18. Akbaridoust, F., et al., Simultaneous Micro-PIV Measurements and Real-Time Control Trapping in a Cross-slot Channel, Experiments in Fluids, 59 (2018), Nov., pp. 1-17
  19. Li, H. W., et al., Experimental and Numerical Investigations on the Flow Characteristics within Hydro-dynamic Entrance Regions in Microchannels, Micromachines, 10 (2019), 5, pp. 1-20
  20. Xiong, Q. Q., et al., Micro-PIV Measurement and CFD Simulation of Flow Field and Swirling Strength During Droplet Formation Process in a Coaxial Microchannel, Chemical Engineering Science, 185 (2018), Aug., pp. 157-167
  21. Wereley, S. T., Meinhart, C. D., Recent Advances in Micro-Particle Image Velocimetry, Annual Review of Fluid Mechanics, 42 (2010), Jan., pp. 557-576
  22. Tannehill, J. C., et al., Computational Fluid Mechanics and Heat Transfer, Hemisphere Publishing Cor-poration, Washington, USA, 1984

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