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Research Papers: Micro/Nanoscale Heat Transfer

An Experimental Investigation on Heat Transfer Characteristics of Hot Surface by Using CuO–Water Nanofluids in Circular Jet Impingement Cooling

[+] Author and Article Information
Mayank Modak

Discipline of Mechanical Engineering,
Indian Institute of Technology Indore,
Indore 453552, Madhya Pradesh, India
e-mail: mayankmodak1989@gmail.com

Sandesh S. Chougule

Department of Mechanical—
Mechatronics Engineering,
The LNM Institute of Information Technology,
Rupa Ki Nangal, Post-Sumel,
Jaipur 302031, Rajasthan, India
e-mail: chidanand2419@gmail.com

Santosh K. Sahu

Mem. ASME
Discipline of Mechanical Engineering,
Indian Institute of Technology Indore,
Indore 453552, Madhya Pradesh, India
e-mail: santosh.sahu04@gmail.com

1Corresponding author.

Presented at the 5th ASME 2016 Micro/Nanoscale Heat & Mass Transfer International Conference. Paper No. NMHMT2016-6629.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received June 21, 2016; final manuscript received March 8, 2017; published online August 16, 2017. Assoc. Editor: Robert D. Tzou.

J. Heat Transfer 140(1), 012401 (Aug 16, 2017) (10 pages) Paper No: HT-16-1407; doi: 10.1115/1.4037396 History: Received June 21, 2016; Revised March 08, 2017

In the present study, an experimental investigation has been carried out to analyze the heat transfer characteristics of CuO–water nanofluids jet on a hot surface. A rectangular stainless steel foil (AISI-304, 0.15 mm thick) used as the test surface is electrically heated to obtain the required initial temperature (500 °C). The distribution of surface heat flux on the target surface is evaluated from the recorded thermal images during transient cooling. The effect of nanoparticle concentration and Reynolds number of the nanofluids on the heat transfer characteristics is studied. Tests are performed for varied range of Reynolds number (5000 ≤ Re ≤ 12,000), two different CuO–water nanofluids concentration (Ф = 0.15%, 0.6%) and two different nozzle to plate distance (l/d = 6, 12). The enhancement in Nusselt number for CuO–water nanofluids was found to be 14% and 90%, for nanofluids concentration of Ф = 0.15% and Ф = 0.60%, respectively, compared to pure water. The test surface characteristics after nanofluids jet impingement are studied using scanning electron microscope (SEM). Based on the investigation, a correlation among various parameters, namely, Reynolds number (Re), Prandtl number (Pr), nozzle to plate distance (l/d), and Nusselt number (Nu), is presented.

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Figures

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Fig. 1

(a) Schematic diagram of the test facility and (b) schematic of the target plate assembly

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Fig. 5

Thermal images during transient cooling of hot surface with nanofluids ф = 0.15 at Re = 5000

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Fig. 2

SEM image of CuO nanoparticle

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Fig. 6

Surface temperature transients during cooling of the hot foil at Re = 8000 and l/d = 6

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Fig. 3

Variation of thermal conductivity of nanofluids with temperature

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Fig. 4

Variation of absolute viscosity of nanofluids with temperature

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Fig. 9

Variation of surface heat flux with temperature at Re = 5000

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Fig. 10

The SEM image of the hot foil after impingement by: (a) water and (b) CuO–water nanofluids

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Fig. 11

Contact angle for hot steel foil after liquid jet impingement: (a) water, (b) 0.15% CuO–water nanofluids, and (c) 0.60% CuO–water nanofluids

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Fig. 12

Comparison of predicted Nusselt number with experimental Nusselt number

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Fig. 7

Variation of stagnation point Nusselt number with Reynolds numbers for: (a) l/d = 6 and (b) l/d = 12

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Fig. 8

Variation of heat transfer coefficient with radial location: (a) Re = 5000 and (b) 9500

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