Research Papers: Evaporation, Boiling, and Condensation

Estimation and Analysis of Surface Heat Flux During Quenching in CNT Nanofluids

[+] Author and Article Information
K. Babu

Department of Mechanical Engineering, SSN College of Engineering, Kalvakkam, Chennai 603110, Indiababuk@ssn.edu.in

T. S. Prasanna Kumar

Department of Metallurgical and Materials Engineering, Indian Institute of Technology Madras, Chennai 600036, Indiatsp@iitm.ac.in

J. Heat Transfer 133(7), 071501 (Apr 01, 2011) (8 pages) doi:10.1115/1.4003572 History: Received February 22, 2010; Revised February 01, 2011; Published April 01, 2011; Online April 01, 2011

In this article, water based carbon nanotube (CNT) nanofluids have been used as quenchants to study their effects on the heat transfer rate during immersion quenching. For this purpose, water based CNT nanofluids were prepared by dispersing CNTs with and without the use of surfactant. Quench probes with a diameter of 20 mm and a length of 50 mm were prepared from 304L stainless steel. Thermocouples were fixed at the selected location inside the quench probes and the probes were quenched in distilled water and CNT nanofluids. During quenching, time-temperature data were recorded using a data acquisition system. The heat flux and temperature at the quenched surface were estimated through the inverse heat conduction method. The computation results showed that the peak heat flux was higher by 37.5% during quenching in CNT nanofluid prepared without surfactant than that in water. However, surfactant assisted CNT nanofluid promoted a prolonged vapor phase during quenching and hindered the heat transfer rates significantly. The peak heat flux was dropped by 24.9% during quenching in CNT nanofluid prepared with surfactant as compared with its base fluid of water.

Copyright © 2011 by American Society of Mechanical Engineers
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Figure 1

(a) XRD pattern of CNT and (b) TEM picture of CNT powder

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Figure 2

(a) Nanofluid settling after 1 day and (b) nanofluid settling after 1 week

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Figure 3

Wettability of different quenchants used

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Figure 4

Viscosity of different quenchants used

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Figure 5

(a) Schematic of the quench probes and (b) photograph of the quench probe showing the thermocouples

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Figure 6

FE mesh showing the TC2 location for the inverse estimation of surface heat flux

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Figure 7

Measured temperature data during quenching in water and nanofluids

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Figure 8

Computed cooling curve at the probe surface

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Figure 9

Cooling rate at the probe surface

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Figure 10

Transient heat flux at the quenched surface

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Figure 11

Boiling curve during quenching in different fluids

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Figure 12

Quench probes quenched in (a) water and (b) TCNT nanofluid



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