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Research Papers: Evaporation, Boiling, and Condensation

Nucleate Pool Boiling Heat Transfer Measurement and Flow Visualization for Ammonia-Water Mixture

[+] Author and Article Information
A. Sathyabhama1

 Research Scholar Department of Mechanical Engineering NITK, Surathkal/Faculty MSRIT, Vidya Soudha, MSR Nagar, MSRIT Post, Bangalore-560 054, Karnataka, India e-mail: sathyabhamaa@hotmail.com Professor Department of Mechanical Engineering NITK, Surathkal Post Srinivasnagar, Mangalore 575 025, Karnataka, India

T. P. Ashok Babu

 Research Scholar Department of Mechanical Engineering NITK, Surathkal/Faculty MSRIT, Vidya Soudha, MSR Nagar, MSRIT Post, Bangalore-560 054, Karnataka, India e-mail: sathyabhamaa@hotmail.com Professor Department of Mechanical Engineering NITK, Surathkal Post Srinivasnagar, Mangalore 575 025, Karnataka, India

1

Corresponding author.

J. Heat Transfer 133(10), 101506 (Aug 23, 2011) (7 pages) doi:10.1115/1.4004258 History: Received May 28, 2010; Accepted May 18, 2011; Published August 23, 2011; Online August 23, 2011

Visualization of bubble nucleation during nucleate pool boiling outside a vertical cylindrical heated surface was done for ammonia-water binary mixture in order to obtain a descriptive behavior of the boiling, which was directly compared with the measured heat transfer coefficient data at low pressure of 4–8 bar and at low mass fraction of 0 < x < 0.3 and at different heat flux. Still images taken with high speed camera are used to demonstrate the decrease in boiling heat transfer coefficient with increase in ammonia mass fraction. Jensen and Memmel model has better agreement with experimental bubble diameter. Further work is required to obtain quantitative information about bubble nucleation parameters. It is found that both Calus and Rice and Stephan–Koorner correlation can predict the experimental heat transfer coefficient values with a maximum deviation of ± 20%.

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Copyright © 2011 by American Society of Mechanical Engineers
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Figures

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Figure 1

Schematic diagram of experimental setup

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Figure 2

Details of test heater

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Figure 3

Boiling curve at 4 bar pressure and (b) effect of ammonia mass fraction on heat transfer coefficient

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Figure 4

Comparison of Stephan–Koorner correlation with experimental data

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Figure 5

Comparison of Thome and Shakir correlation with experimental data

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Figure 6

Comparison of Fujita–Tsutsui correlation with experimental data

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Figure 7

Comparison of Calus and Rice correlation with experimental data

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Figure 8

Visual record of boiling phenomena

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Figure 9

(a) and (b) Comparison between the measured bubble diameter and predicted bubble diameter from the correlations

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