The effect of adding one of three salts (NaCl, or to water sprayed on a hot surface was studied experimentally. A copper test surface was heated to 240°C and quenched with a water spray. The variation of surface temperature during cooling was recorded, and the surface heat flux calculated from these measurements. Surface heat flux during cooling with pure water sprays was compared with that obtained using salt solutions. Dissolved NaCl or increased nucleate boiling heat transfer, but had little effect on transition boiling during spray cooling. increased both nucleate and transition boiling heat flux. Enhanced nucleate boiling was attributed to foaming in the liquid film generated by the dissolved salts. produced the largest increase in nucleate boiling heat transfer, somewhat less and NaCl the least. A concentration of 0.2 mol/l of produced the greatest heat flux enhancement; higher salt concentrations did not result in further improvements. During transition boiling particles of adhered to the heated surface, raising surface roughness and increasing heat transfer. Addition of reduced the time required to cool a hot surface from 240°C to 120°C by an order of magnitude.
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Technical Papers
The Effect of Dissolving Salts in Water Sprays Used for Quenching a Hot Surface: Part 2—Spray Cooling
Qiang Cui,
Qiang Cui
Department of Mechanical and Industrial Engineering, University of Toronto, Toronto, Ontario M5S 3G8, Canada
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Sanjeev Chandra,
e-mail: chandra@mie.utoronto.ca
Sanjeev Chandra
Department of Mechanical and Industrial Engineering, University of Toronto, Toronto, Ontario M5S 3G8, Canada
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Susan McCahan
Susan McCahan
Department of Mechanical and Industrial Engineering, University of Toronto, Toronto, Ontario M5S 3G8, Canada
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Qiang Cui
Department of Mechanical and Industrial Engineering, University of Toronto, Toronto, Ontario M5S 3G8, Canada
Sanjeev Chandra
Department of Mechanical and Industrial Engineering, University of Toronto, Toronto, Ontario M5S 3G8, Canada
e-mail: chandra@mie.utoronto.ca
Susan McCahan
Department of Mechanical and Industrial Engineering, University of Toronto, Toronto, Ontario M5S 3G8, Canada
Contributed by the Heat Transfer Division for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received by the Heat Transfer Division February 27, 2002; revision received October 7, 2002. Associate Editor: D. B. R. Kenning.
J. Heat Transfer. Apr 2003, 125(2): 333-338 (6 pages)
Published Online: March 21, 2003
Article history
Received:
February 27, 2002
Revised:
October 7, 2002
Online:
March 21, 2003
Citation
Cui , Q., Chandra, S., and McCahan, S. (March 21, 2003). "The Effect of Dissolving Salts in Water Sprays Used for Quenching a Hot Surface: Part 2—Spray Cooling ." ASME. J. Heat Transfer. April 2003; 125(2): 333–338. https://doi.org/10.1115/1.1532011
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