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Research Papers

Self-Propelled Sliding Bubble Motion Induced by Surface Microstructure in Pool Boiling of a Dielectric Fluid Under Microgravity

[+] Author and Article Information
Naveenan Thiagarajan

Electronics Cooling Laboratory,
GE Global Research,
Niskayuna, NY 12309
e-mail: naveenan.thiagarajan@ge.com

Sushil H. Bhavnani

Professor
Department of Mechanical Engineering,
Auburn University,
Auburn, AL 36849
e-mail: bhavnsh@auburn.edu

Vinod Narayanan

Associate Professor
School of Mechanical Industrial
and Manufacturing Engineering,
Oregon State University,
Corvallis, OR 96331
e-mail: vinod.narayanan@oregonstate.edu

Contributed by the Electronic and Photonic Packaging Division of ASME for publication in the JOURNAL OF ELECTRONIC PACKAGING. Manuscript received August 22, 2014; final manuscript received November 23, 2014; published online January 19, 2015. Assoc. Editor: Pradip Dutta.

J. Electron. Packag 137(2), 021009 (Jun 01, 2015) (8 pages) Paper No: EP-14-1073; doi: 10.1115/1.4029246 History: Received August 22, 2014; Revised November 23, 2014; Online January 19, 2015

This paper reports bubble dynamics observed during pool boiling over microstructures with an asymmetric saw-tooth cross section, under reduced gravity. The periodic saw-toothed ratchets etched on a silicon surface include fabricated vapor bubble nucleation sites only on the shallow slope. Reduced gravity pool boiling experiments were conducted aboard a Boeing 727 aircraft carrying out parabolic maneuvers. The fluid used was FC-72, a highly wetting dielectric fluid used as a coolant for electronics. Under microgravity, it was observed that the bubble diameters were six times larger than in terrestrial gravity. Also, self-propelled sliding bubble motion along the surface of the saw teeth was observed in reduced gravity. The velocity of the sliding bubbles across the saw teeth, following lateral departure from the cavities, was measured to be as high as 27.4 mm/s. A model for the sliding bubble motion is proposed by attributing it to the force due to pressure differences that arise in the liquid film between the vapor bubble and the saw-toothed heated surface. The pressure difference is due to difference in the radius of curvature of the interface between the crest and trough of the saw teeth. The surface modification technique, which resulted in the sliding bubble motion, has the potential to alleviate dry-out caused due to stagnant vapor bubbles over heat sources under microgravity when the buoyancy forces are negligible compared to the surface tension forces.

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References

Geng, X., Yuan, H., Oguz, H., and Prosperetti, A., 2001, “Bubble-Based Micropump for Electrically Conducting Liquids,” J. Micromech. Microeng., 11(3), pp. 270–276. [CrossRef]
Meng, D. D., and Kim, C. J., 2008, “Micropumping of Liquid by Directional Growth and Selective Venting of Gas Bubbles,” Lab Chip, 8(6), pp. 958–968. [CrossRef] [PubMed]
Mukherjee, S., and Mudawar, I., 2003, “Pumpless Loop for Narrow Channel and Micro-Channel Boiling,” ASME J. Electron. Packag., 125(3), pp. 431–441. [CrossRef]
Thompson, R., DeWitt, K., and Labus, T., 1980, “Marangoni Bubble Motion Phenomenon in Zero Gravity,” Chem. Eng. Commun., 5(5–6), pp. 299–314. [CrossRef]
Zhang, N., and Chao, D., 1999, “Models for Enhanced Boiling Heat Transfer by Unusual Marangoni Effects Under Microgravity Conditions,” Int. Commun. Heat Mass Transfer, 26(8), pp. 1081–1090. [CrossRef]
Linke, H., Alemán, B., Melling, L., Taormina, M., Francis, M., Dow-Hygelund, C., Narayanan, V., Taylor, R., and Stout, A., 2006, “Self-Propelled Leidenfrost Droplets,” Phys. Rev. Lett., 96(15), p. 154502. [CrossRef] [PubMed]
Nimkar, N., Bhavnani, S., and Jaeger, R., 2006, “Benchmark Heat Transfer Data for Microstructured Surfaces for Immersion-Cooled Microelectronics,” IEEE Trans. Compon. Packag. Technol., 29(1), pp. 89–97. [CrossRef]
Thiagarajan, N., Kapsenberg, F., Narayanan, V., Bhavnani, S., and Ellis, C., 2012, “Development of a Heat Sink With Periodic Asymmetric Structures Using Grayscale Lithography and Deep Reactive Ion Etching,” IEEE Electron Device Lett., 33(7), pp. 1054–1056. [CrossRef]
Kapsenberg, F., Strid, L., Thiagarajan, N., Narayanan, V., and Bhavnani, S., 2014, “On the Lateral Fluid Motion During Pool Boiling Via Preferentially Located Cavities,” Appl. Phys. Lett., 104(15), p. 154105. [CrossRef]
Zell, M., Straub, J., and Weinzierl, A., 1984, “Nucleate Pool Boiling in Subcooled Liquid Under Microgravity Results of Texus Experimental Investigations,” 5th European Symposium on Material Science Under Microgravity, Elmau, Germany, Nov. 5–7, pp. 327–333.
Henry, C., and Kim, J., 2004, “A Study of the Effects of Heater Size, Subcooling, and Gravity Level on Pool Boiling Heat Transfer,” Int. J. Heat Fluid Flow, 25(2), pp. 262–273. [CrossRef]
Qiu, D., Dhir, V., Chao, D., Hasan, M., Neumann, E., Yee, G., and Birchenough, A., 2002, “Single-Bubble Dynamics During Pool Boiling Under Low Gravity Conditions,” J. Thermophys. Heat Transfer, 16(3), pp. 336–345. [CrossRef]
Lee, H. S., and Merte, H., 1999, “Pool Boiling Mechanisms in Microgravity,” International Conference on Microgravity Fluid Physics and Heat Transfer, Oahu, HI, Sept. 19–24, pp. 19–24.
Kim, J., and Benton, J., 2002, “Highly Subcooled Pool Boiling Heat Transfer at Various Gravity Levels,” Int. J. Heat Fluid Flow, 23(4), pp. 497–508. [CrossRef]
Hadland, P., Balasubramaniam, R., Wozniak, G., and Subramanian, R., 1999, “Thermocapillary Migration of Bubbles and Drops at Moderate to Large Marangoni Number and Moderate Reynolds Number in Reduced Gravity,” Exp. Fluids, 26(3), pp. 240–248. [CrossRef]
Henry, C., Kim, J., and McQuillen, J., 2006, “Dissolved Gas Effects on Thermocapillary Convection During Boiling in Reduced Gravity Environments,” Heat Mass Transfer, 42(10), pp. 919–928. [CrossRef]
Herman, C., Iacona, E., Földes, I., Suner, G., and Milburn, C., 2002, “Experimental Visualization of Bubble Formation From an Orifice in Microgravity in the Presence of Electric Fields,” Exp. Fluids, 32(3), pp. 396–412. [CrossRef]
Thiagarajan, N., Kapsenberg, F., Narayanan, V., Bhavnani, S. H., and Ellis, C., 2011, “On the Lateral Motion of Bubbles Generated From Re-Entrant Cavities Located on Asymmetrically Structured Surfaces,” ASME Paper No. IPACK2011-52056 [CrossRef].
Henry, C. D., Kim, J., Chamberlain, B., and Hartman, T. G., 2005, “Heater Size and Heater Aspect Ratio Effects on Subcooled Pool Boiling Heat Transfer in Low-g,” Exp. Therm. Fluid Sci., 29(7), pp. 773–782. [CrossRef]
Chen, T., and Garimella, S. V., 2006, “Effects of Dissolved Air on Subcooled Flow Boiling of a Dielectric Coolant in a Microchannel Heat Sink,” ASME J. Electron. Packag., 128(4), pp. 398–404. [CrossRef]
Carey, V., 1992, Liquid–Vapor Phase-Change Phenomena: An Introduction to the Thermophysics of Vaporization and Condensation Processes in Heat Transfer Equipment, Taylor & Francis, London, UK.
Papanastasiou, T., Georgiou, G., and Alexandrou, A. N., 2010, Viscous Fluid Flow, CRC Press, Boca Raton, FL [CrossRef].
Rainey, K., You, S., and Lee, S., 2003, “Effect of Pressure, Subcooling, and Dissolved Gas on Pool Boiling Heat Transfer From Microporous, Square Pin-Finned Surfaces in FC-72,” Int. J. Heat Mass Transfer, 46(1), pp. 23–35. [CrossRef]

Figures

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Fig. 1

Experimental setup used for the reduced gravity experiments

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Fig. 2

Accelerometer data of gravity profile along the three axes—gx, gy, and gz. The nose of the aircraft was oriented toward the y-axis. x is the horizontal lateral axis and z is the vertical axis.

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Fig. 3

Bubble dynamics in FC-72 under μg. (a) Sliding motion of vapor bubbles at a velocity of ≈10 mm/s, across the saw-teeth (left to right in images) at q″ = 0.5 W/cm2 and ΔTsub = 23.6 °C. Sliding motion was observed at all tested conditions. (b) Sliding motion of vapor bubbles (left to right in the images) at q″ = 1.4 W/cm2 and ΔTsub = 22.8 °C.

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Fig. 4

Bubble dynamics in FC-72 under 1.8 g. Bubble departure diameters are very small compared to those at 1 g (≈0.25 D1g). Bubbles were observed to grow and depart at an angle normal to the shallow slope of the saw-teeth, a phenomenon that was previously demonstrated under 1 g.

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Fig. 5

(a) Average sliding velocity of bubbles under reduced gravity. (b) Effect of bubble coalescence on sliding velocity. Uncertainty in bubble velocity is ±0.5%.

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Fig. 6

Schematic diagram of bubble motion over a saw-tooth in FC-72 under μg (not to scale). The arrows marked between the saw-tooth and the vapor bubble indicate the direction of forces acting on the bubble due to pressure differences.

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Fig. 7

(a) Liquid–vapor interface of a sliding vapor bubble in FC-72 under microgravity at 0.45 W/cm2. The estimated liquid film thickness using image processing techniques is ≈20–75 μm (b) Schematic diagram of the liquid-vapor interface.

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Fig. 8

Estimated bubble sliding velocities for liquid film thickness varying from 0 to 25 μm. The experimental bubble velocity of 27.4 mm/s is predicted closely for a H value of 24 μm.

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Fig. 9

Boiling curve with FC-72 under μg at ΔTsub = 21.5 °C. Uncertainties in q″ and (Tw − Tsat) are ±1% and ±0.3%, respectively.

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