Research Papers

Determination of Rewetting Velocity During Jet Impingement Cooling of a Hot Surface

[+] Author and Article Information
Chitranjan Agrawal

Department of Mechanical Engineering,
College of Technology and Engineering,
Maharana Pratap University of Agriculture and Technology,
Udaipur 313001, India
e-mail: chitranjanagr@gmail.com

Ravi Kumar

e-mail: ravikfme@iit.ernet.in

Akhilesh Gupta

e-mail: akhilfme@iit.ernet.in
Department of Mechanical and Industrial Engineering,
Indian Institute of Technology Roorkee,
Roorkee 247667, India

Barun Chatterjee

Reactor Safety Division,
Bhabha Atomic Research Centre,
Mumbai 400085, India
e-mail: barun@barc.gov.in

1Corresponding author.

Manuscript received June 24, 2011; final manuscript received July 27, 2012; published online March 18, 2013. Assoc. Editor: Mark North.

J. Thermal Sci. Eng. Appl 5(1), 011007 (Mar 18, 2013) (10 pages) Paper No: TSEA-11-1083; doi: 10.1115/1.4007437 History: Received June 24, 2011; Revised July 27, 2012

An experimental investigation has been carried out to study the cooling of a hot horizontal stainless steel surface of 0.25 mm thickness, which has 800 ± 10 °C initial temperature. A round water jet of 22 ± 1 °C temperature was injected over the hot surface through a straight tubes type nozzle of 2.5 mm diameter and 250 mm length. The experiments were performed for the jet exit to target surface spacing in a range of 4–16 times of jet diameter and jet Reynolds number in a range of 5000–24,000. The rewetting velocity during transient cooling of hot surface was determined with the help of time variant surface temperature data and with the captured thermal images of the hot surface as well. The effect of Reynolds number, Re, jet exit to surface spacing, z/d, on the rewetting velocity has been determined for the different downstream spatial locations. A correlation has also been developed to determine the rewetting velocity, which predicts 75% of experimental data within an error band of ±10%.

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Fig. 1

Schematic of experimental setup

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Fig. 2

Schematic of (a) nozzle assembly and (b) test surface

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Fig. 3

Comparison of experimental stagnation Nusselt number with available correlations under steady state cooling conditions without boiling

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Fig. 4

Comparison of experimental local Nusselt number with that predicted by Stevens and Webb [22] correlation for the steady state cooling conditions without boiling

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Fig. 5

Radial variation of Nusselt number with Reynolds number for the steady state cooling conditions without boiling

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Fig. 6

Cooling curves at different radial location for Re (a) 5000 and (b) 24,000 at z/d = 4

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Fig. 7

Effect of z/d on local rewetting velocity at different radial location: (a) Re = 5000, (b) Re = 10,000, (c) Re = 16,000, and (d) Re = 24,000

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Fig. 8

Effect of z/d on transit rewetting velocity: (a) Re = 5000, (b) Re = 10,000, (c) Re = 16,000, and (d) Re = 24,000

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Fig. 9

Thermal images of the surface at Re = 5000, z/d = 4: (a) 0.00 s, (b) 0.05 s, (c) 0.50 s, and (d) 1.00 s

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Fig. 10

Comparison of local rewetting velocity obtained by surface temperature data and infrared images

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Fig. 11

Comparison of experimental rewetting number with that predicted by the developed correlations



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