Research Papers: Evaporation, Boiling, and Condensation

Surfactant-Based Cu–Water Nanofluid Spray for Heat Transfer Enhancement of High Temperature Steel Surface

[+] Author and Article Information
Satya V. Ravikumar, Jay M. Jha, Krishnayan Haldar

Department of Chemical Engineering,
IIT Kharagpur,
West Bengal 721302, India

Surjya K. Pal

Department of Mechanical Engineering,
IIT Kharagpur,
West Bengal 721302, India

Sudipto Chakraborty

Department of Chemical Engineering,
IIT Kharagpur,
West Bengal 721302, India
e-mail: sc@che.iitkgp.ernet.in

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received June 4, 2014; final manuscript received February 4, 2015; published online March 3, 2015. Assoc. Editor: Wilson K. S. Chiu.

J. Heat Transfer 137(5), 051504 (May 01, 2015) (8 pages) Paper No: HT-14-1390; doi: 10.1115/1.4029815 History: Received June 04, 2014; Revised February 04, 2015; Online March 03, 2015

Spray cooling is critical in many industrial applications to extract large heat fluxes from metal parts, such as hypervapotron in nuclear fusion reactors, heat treatment of steel plates in run-out table (ROT), electronic parts, and many more. The objective of the present study is to enhance the heat dissipation in transition and nucleate boiling regimes using an air-atomized water spray with water-based copper nanofluid as a coolant. The nanoparticle used in this study is energetic metal Cu, which has been prepared by mechanical milling (MM) process. The nanofluid has been prepared by suspending 0.1 vol. % Cu nanoparticles in water, with or without a dispersing agent (surfactant). The effect of type of dispersing agent on augmentation of boiling heat transfer has also been studied. The spray cooling experiments are conducted on a 6 mm thick stainless steel plate of initial temperature above 900 °C. The transient surface heat flux and temperatures are estimated using commercial inverse heat conduction software named intemp. The experimental results illustrated that transition and nucleate boiling heat flux as well as critical heat flux (CHF) increased significantly using nanofluid spray. A maximum ultrafast cooling (UFC) rate of 267 °C/s is achieved using surfactant-based nanofluid spray, which is 31.53% and 59.88% higher as compared to the nanofluid without any dispersant and pure water sprays, respectively. Overall, the surfactant-based copper nanofluid spray can serve as a better coolant on the ROT of steel processing industry.

Copyright © 2015 by ASME
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Fig. 1

Schematic representation of test plate with thermocouple locations

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Fig. 2

Calculated and measured temperatures at thermocouple location 4

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Fig. 3

XRD patterns of the copper powder at different milling times

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Fig. 4

Variation of copper phase crystallite size and RMS strain with milling time

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Fig. 5

Particle size distribution for the 0.1 vol. % copper nanofluid

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Fig. 6

Transient temperature measurement using embedded thermocouples during air-atomized spray cooling with pure water coolant

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Fig. 7

Variation of surface temperature (Ts) and surface heat flux (q'') with cooling time at the stagnant zone

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Fig. 8

The effect of nanofluid spray, with or without any surfactant on (a) surface heat flux and (b) surface heat transfer coefficient

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Fig. 9

SEM image and energy spectrum charts of the surface after pure water spray (a) and (c) nanofluid spray (b) and (d)

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Fig. 10

Effect of nanofluid spray on UFC rate of steel




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