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Spray cooling of hot steel plate using aqueous solution of surfactant and polymer
Spray cooling of hot steel plate using aqueous solution of surfactant and polymer
- Source :
- Thermal Science and Engineering Progress. 10:217-231
- Publication Year :
- 2019
- Publisher :
- Elsevier BV, 2019.
-
Abstract
- In the current work, authors have performed extensive spray cooling experiments on a 6 mm thick hot stainless steel plate (>900 °C). The work has been separated into two distinctive parts. The first part involves optimization of water flow rate and spray impingement height based on maximum surface cooling rate and heat flux value. The highest cooling rate and heat flux of 133.7 °C/s and 2.21 MW/m2 were attained for a water flow rate of 16 lpm and impingement height of 6 cm. In the second part, different surfactants (cationic, CTAB; anionic, SDS; non-ionic, Tween 20), and polymer (PVP, water soluble) were added in to the water to study its impact on heat transfer parameters such as surface cooling rate, heat flux, and heat transfer coefficient. Amongst all the additives, the maximum enhancement in cooling rate and critical heat flux was achieved for non-ionic (Tween 20) based water solution which is 25.6% (168.2 °C/s) and 19.91% (2.65 MW/m2) higher than what had been attained by water spray. High speed photography was used at a lower temperature to visualize a single droplet impact and to understand the effect of surface tension and underlying physics on the heat transfer phenomenon. This study revealed that upon impingement, surfactant and polymer added drops disintegrate into multiple drops, increasing the overall contact area, and thereby enhancing the heat transfer rate.
- Subjects :
- Fluid Flow and Transfer Processes
Work (thermodynamics)
Aqueous solution
Water flow
Critical heat flux
020209 energy
02 engineering and technology
Heat transfer coefficient
01 natural sciences
010305 fluids & plasmas
Surface tension
Heat flux
0103 physical sciences
Heat transfer
0202 electrical engineering, electronic engineering, information engineering
Composite material
Subjects
Details
- ISSN :
- 24519049
- Volume :
- 10
- Database :
- OpenAIRE
- Journal :
- Thermal Science and Engineering Progress
- Accession number :
- edsair.doi...........e86314c2ae13b08774a7a0c7b8d16da1
- Full Text :
- https://doi.org/10.1016/j.tsep.2019.02.003