Upward and Downward Facing High Mass Flux Spray Cooling with Additives: A Novel Technique to Enhance the Heat Removal Rate at High Initial Surface Temperature
The objective of the current work is to enhance the spray cooling by changing the orientation of the nozzle with different additives (acetone, methanol, ethanol, benzene, n-hexane, tween 20 and salt) in water. The experiments are carried out by upward, downward and both upward and downward facing sprays. The optimization result depicts that the spray produced by upward facing spray gives higher heat flux than the downward facing spray and also cooling by both the upward and downward facing spray simultaneously produces better result than the individual. Further experiments with both upward and downward facing spray by using different coolants reveal that in case of cooling by ethanol (500 ppm) + water mixture, the maximum enhancement of surface heat flux (~2.57 MW/m2) and cooling rate (204 °C/s) is observed. However, the minimum surface heat flux is achieved in case of methanol (100 ppm) + water due to higher contact angle (710) among all the considered coolants.
A. R. Pati et al., "Upward and Downward Facing High Mass Flux Spray Cooling with Additives: A Novel Technique to Enhance the Heat Removal Rate at High Initial Surface Temperature," Heat and Mass Transfer/Waerme- und Stoffuebertragung, vol. 54, no. 6, pp. 1669 - 1680, Springer Verlag, Jun 2018.
The definitive version is available at https://doi.org/10.1007/s00231-017-2258-2
Materials Science and Engineering
Keywords and Phrases
Acetone; Coolants; Cooling; Ethanol; Facings; Hexane; Methanol; Spray nozzles; Spray steelmaking, Cooling rates; Heat removal rates; Minimum surfaces; Novel techniques; Spray cooling; Surface heat fluxes; Surface temperatures; Water mixture, Heat flux
International Standard Serial Number (ISSN)
Article - Journal
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01 Jun 2018