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Research Papers

Experimental Investigation of Heat Transfer Coefficient and Correlation Development for Subcooled Flow Boiling of Water–Ethanol Mixture in Conventional Channel

[+] Author and Article Information
B. G. Suhas

Mechanical Engineering Department,
National Institute of Technology Karnataka,
Srinivasanagara, Surathkal,
Mangalore, Karnataka 575025, India
e-mail: suhas_bg@yahoo.co.in

A. Sathyabhama

Mechanical Engineering Department,
National Institute of Technology Karnataka,
Srinivasanagara, Surathkal,
Mangalore, Karnataka 575025, India
e-mail: bhama72@gmail.com

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF THERMAL SCIENCE AND ENGINEERING APPLICATIONS. Manuscript received April 9, 2016; final manuscript received January 21, 2017; published online April 19, 2017. Assoc. Editor: Wei Li.

J. Thermal Sci. Eng. Appl 9(4), 041003 (Apr 19, 2017) (11 pages) Paper No: TSEA-16-1089; doi: 10.1115/1.4036202 History: Received April 09, 2016; Revised January 21, 2017

In this present work, bubble dynamics of subcooled flow boiling in water–ethanol mixture is investigated through visualization using a high-speed camera in horizontal rectangular channels. The heat transfer coefficient of water–ethanol mixture during subcooled flow boiling is determined for various parameters like heat flux, mass flux, and channel inlet temperature. The effect of bubble departure diameter on heat transfer coefficient is discussed. A correlation is developed for subcooled flow boiling Nusselt number of water–ethanol mixture. The parameters considered for correlation are grouped as dimensionless numbers by Buckingham π-theorem. The present correlation is compared with the experimental data. The mean absolute error (MAE) of Nusselt number of water–ethanol mixture calculated from the experimental data and those predicted from the present correlation is 10.39%. The present correlation is also compared with the available literature correlations developed for water. The MAE of Nusselt number of water predicted from the present correlation and those predicted with Papel, Badiuzzaman, Moles–Shaw, and Baburajan correlations is 41%, 19.61%, 29.9%, and 43.1%, respectively.

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Figures

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Fig. 1

Schematic diagram of experimental setup: (1) Rectangular aluminum block consisting of two rectangular channels, (2) condenser coil dipped in ice water bath, (3) reservoir, (4) pump with variable flow rate, (5) preheater, (6) two cartridge heaters, (7) thermocouples to measure wall temperature, (8) thermocouple to measure channel inlet temperature, (9) thermocouple to measure channel outlet temperature, (10) temperature indicator panel, (11) high-speed camera, (12) light source, and (13) data acquisition system for flow visualization

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Fig. 2

Aluminum block with rectangular channels

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Fig. 3

Arrangement of thermocouples in the cold plate

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Fig. 4

Variation of subcooled boiling heat transfer coefficient with ethanol volume fraction at various inlet temperatures

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Fig. 5

Variation of heat transfer coefficient and (Td−Tb) with volume fraction

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Fig. 6

Bubble formation for (a) water (b) 25% ethanol volume fraction (c) 50% ethanol volume fraction (d) 75% ethanol volume fraction (e) ethanol

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Fig. 7

Vartiation of dimensionless bubble departure diameter with ethanol volume fraction

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Fig. 8

(a) π6 versus π1 , (b) π6 versus π1π2, (c) π6 versus π1π2π3, (d) π6 versus π1π2π3π4, and (e) π6 versus π1π2π3π4π5

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Fig. 9

Various stages of bubble formation and growth due to change in phase (a) bubble nucleation, (b) bubble growth, (c) bubble departure. (Pure water at heat flux of 133.47 kW/m2, mass flux = 76.67 kg/kW m2 and channel inlet temperature = 303 K.)

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Fig. 10

π3 versus ethanol volume fraction

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Fig. 11

π4 versus ethanol volume fraction

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Fig. 12

π5 versus ethanol volume fraction

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Fig. 13

Experimental data versus present correlation

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Fig. 14

(a) Validation of present correlation with (a) Papel correlation, (b) Badiuzzamin correlation, (c) Moles–Shaw correlation, and (d) Baburajan correlation

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