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Enhancement of Droplet Heat Transfer Using Dissolved Gases
ISSN: 0148-7191, e-ISSN: 2688-3627
Published October 29, 2002 by SAE International in United States
Annotation ability available
Event: Power Systems Conference
Droplet evaporation can be used to transfer large amounts of energy since heat is transferred across a thin liquid film. Spreading the drop over a larger area can enhance this heat transfer. One method of accomplishing this is to dissolve gas into the liquid. When the drop strikes the surface, a gas bubble nucleates and can grow and merge within the liquid, resulting in an increase in the droplet diameter. In this study, time and space resolved heat transfer characteristics for a single droplet striking a heated surface were experimentally investigated. The local wall heat flux and temperature measurements were provided by a novel experimental technique in which 96 individually controlled heaters were used to map the heat transfer coefficient on the surface. A high-speed digital video camera was used to simultaneously record images of the drop from below. The measurements to date indicate that significantly smaller droplet evaporation times can be achieved. The splat diameter was observed to increase with time just after the initial transient dies out due to the growth of the bubble, in contrast to a monotonically decreasing splat diameter for the case of no bubbles. Bursting of the bubble corresponded to a sudden decrease in droplet heat transfer.
CitationLee, J., Kiger, K., and Kim, J., "Enhancement of Droplet Heat Transfer Using Dissolved Gases," SAE Technical Paper 2002-01-3195, 2002, https://doi.org/10.4271/2002-01-3195.
- Bae S. Kim M. H. Kim J. 1999 Improved Technique to Measure Time and Space-Resolved Heat Transfer under Single Bubbles during Saturated Pool Boiling of FC-72 Exp. Heat Transfer 12 265 278
- di Marzo M. Tartarini P. Liao Y. Evans D. Baum H. 1993 Evaporative Cooling Due to a Gently Deposited Droplet Int. J. Heat Mass Transfer 36 4133 4139
- Lee J. Kim J. Kiger K.T. “Time and Space Resolved Heat Transfer Characteristics of Single Droplet Cooling Using Microscale Heater Arrays” International Journal of Heat and Fluid Flow 22 188 200 2001
- Qiao Y. M. Chandra S. 1997 Experiment on Adding a Surfactant to Water Drops Boiling on a Hot Surface Proc. Royal Soc. London A 453 673 689
- Cui Q. Chandra S. McCahan S. “Enhanced boiling of water droplets containing dissolved gases or solids”, Paper No. NHTC 2000-12249” National Heat Transfer Conference Pittsburgh, Pennsylvania August 20-22, (2000)
- Milke J.A. Tinker S.C. diMarzo M. “Effect of dissolved gases on spray evaporative cooling with water” Fire Technology, 2 nd Quarter 33 2 May/June 1997
- Råde L. Westergren B. 1995 Mathematics Handbook for Science and Engineering, Birkhäuser Sweden
- Rule T. D. Kim J. 1999 Heat Transfer Behavior on Small Horizontal Heaters During Pool Boiling of FC-72 J. Heat Transfer 121 386 393
- Rule T. D. Kim J. Kalkur T. S. 1998 Design, Construction, and Qualification of a Microscale Heater Array for Use in Boiling Heat Transfer, NASA/CR-1998-207407
- Rule T. D. Kim J. Quine R. W. Kalkur T. S. Chung J. N. 1999 Measurements of Spatially and Temporally Resolved Heat Transfer Coefficients in Subcooled Pool Boiling Convective Flow and Pool Boiling, Taylor and Francis