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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

Authors :
Sudipto Chakraborty
Samarshi Chakraborty
Surjya K. Pal
Ishita Sarkar
Asmit Roshan
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.

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