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Research Papers

Rewetting of Vertical Pipes by Bottom Flooding Using Nanofluid as a Coolant

[+] Author and Article Information
Gayatri Paul

Department of Mechanical Engineering,
Indian Institute of Technology, Kharagpur,
Kharagpur 721302, West Bengal, India
e-mail: gayatri.paul@gmail.com

Prasanta Kumar Das

Professor and Head
Department of Mechanical Engineering,
Indian Institute of Technology, Kharagpur,
Kharagpur 721302, West Bengal, India
e-mail: pkd@mech.iitkgp.ernet.in

Indranil Manna

Director
Department of Materials Science and Engineering,
Indian Institute of Technology, Kanpur,
Kanpur 208016, Uttar Pradesh, India;
Department of Metallurgical and
Materials Engineering,
Indian Institute of Technology, Kharagpur,
Kharagpur 721302, West Bengal, India
e-mail: imanna@metal.iitkgp.ernet.in

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received May 29, 2014; final manuscript received February 25, 2015; published online August 11, 2015. Assoc. Editor: Sumanta Acharya.

J. Heat Transfer 137(12), 121009 (Aug 11, 2015) (9 pages) Paper No: HT-14-1351; doi: 10.1115/1.4030925 History: Received May 29, 2014

The present investigation reports the rewetting phenomenon by bottom flooding in vertical pipes using both water and nanofluid as coolant. The transient temperature response of rewetted surface indicates that rewetting takes place faster in nanofluids than in water. The effect of several parameters, including the coolant flow rate, distance from the inlet of fluid, concentration of nanoparticle loading on the rewetting characteristics, has been investigated. The rewetting velocity, for both water and nanofluid, is observed to depend strongly on the inlet coolant flow rate and initial wall temperature of the tube. The rewetting velocity is observed to follow the correlation for water proposed in an earlier work. Starting from the logic proposed in that previous report, the authors propose a correlation for predicting the rewetting velocity in nanofluids.

Copyright © 2015 by ASME
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References

Figures

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Fig. 1

(a) Schematic and (b) photographic representation of the propagation of quench front during rewetting by bottom flooding. (c) Temperature–time response during the rewetting phenomenon.

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Fig. 2

(a) XRD, (b) SEM, (c) TEM, and (d) particle size distribution of Al2O3 nanoparticles

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Fig. 3

Schematic diagram of test facility for rewetting in a vertical pipe by bottom flooding

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Fig. 4

(a) Thermal images showing the cooling of a portion of the test section during quenching with water at a coolant flow rate 13.33 g/s and (b) comparison of the temperature profiles obtained from the thermograms (in the region of the black box marked area shown in (a)) and the thermocouple brazed to the test section at a position 690 mm from the bottom of the pipe

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Fig. 5

Temperature–time response for water and 0.3 vol. % Al2O3 dispersed water based nanofluid during rewetting by bottom blooding at coolant flow rate of 13.33 g/s

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Fig. 6

Comparison of temperature–time response for water, 0.1 vol. % and 0.3 vol. % Al2O3 dispersed water based nanofluid at two different thermocouple locations during rewetting by bottom blooding at 40.00 g/s coolant flow rate

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Fig. 7

Temperature–time response for water and 0.1 vol. % Al2O3 dispersed water based nanofluid at coolant flow rates during rewetting by bottom blooding for the thermocouple located at 690 mm from the bottom

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Fig. 8

Comparison of (a) temperature–time response and (b) difference between temperature during rewetting with water and nanofluid with time for water, 0.1 vol. % and 0.3 vol. % Al2O3 dispersed water based nanofluid at two extreme coolant injection rates for thermocouple at 690 mm from the bottom

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Fig. 9

Effect of thermocouple locations (diametrically opposite across the pipe) on the variation of temperature versus time during rewetting for water, 0.1 vol. % and 0.3 vol. % Al2O3 dispersed water based nanofluid at four different positions

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Fig. 10

Graphical estimation of the time of rewetting from the temperature–time response during the propagation of quench front for estimation of the quench front velocity

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Fig. 11

Variation of rewetting time as a function of the quench front traversing length from the bottom of the SS pipe at different coolant flow rates for the pipe initially heated to 500 °C during rewetting of (a) water and 0.1 vol. % and (b) 0.1 vol. % and 0.3 vol. % Al2O3 dispersed water based nanofluid

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Fig. 12

Estimation of quench front velocity of water between different sets of thermocouples along the length of the SS pipe initially heated to 400 °C at two extreme flow rates

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Fig. 13

Effect of initial wall temperature of the pipe on the average quench front velocity for water, 0.1 vol. % and 0.3 vol. % Al2O3 dispersed water based nanofluid

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Fig. 14

Variation of inverse quench front velocity with mass flow rate of water with theoretical correlation prediction given by Ref. [8] (inset: comparison of experimental and calculated nondimensional inverse quench velocity (w))

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Fig. 15

(a) Average quench front velocity with coolant injection velocity and (b) experimental (symbols) and predicted (Eq. (7)) (solid line) values of Fq for water and nanofluid at 400 °C initial wall temperature of the pipe

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