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Research Papers: Heat and Mass Transfer

Effect of Mild Sway on the Interfacial Mass Transfer Rate of Stored Liquids

[+] Author and Article Information
Dibakar Rakshit

School of Mechanical and Chemical Engineering,
The University of Western Australia,
35 Stirling Highway,
Crawley, Western Australia 6009, Australia
e-mail: dibakar@iitd.ac.in

K. P. Thiagarajan

School of Mechanical and Chemical Engineering,
The University of Western Australia,
35 Stirling Highway,
Crawley, Western Australia 6009, Australia

R. Narayanaswamy

Department of Mechanical Engineering,
Curtin University,
Bentley, Western Australia 6845, Australia

1Corresponding author.

2Present address: Centre for Energy Studies, Indian Institute of Technology Delhi, New Delhi 110016, India.

3Present address: Department of Mechanical Engineering, University of Maine, Orono, ME 04469.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received February 26, 2014; final manuscript received May 27, 2015; published online July 14, 2015. Assoc. Editor: Wei Tong.

J. Heat Transfer 137(11), 112001 (Jul 14, 2015) (10 pages) Paper No: HT-14-1095; doi: 10.1115/1.4030835 History: Received February 26, 2014

An exploratory study of two-phase physics was undertaken in a slow moving tank containing liquid. This study is under the regime of conjugate heat and mass transfer phenomena. An experiment was designed and performed to estimate the interfacial mass transfer characteristics of a slowly moving tank. The tank was swayed at varying frequencies and constant amplitude. The experiments were conducted for a range of liquid temperatures and filling levels. The experimental setup consisted of a tank partially filled with water at different temperatures, being swayed using a six degrees-of-freedom (DOF) motion actuator. The experiments were conducted for a frequency range of 0.7–1.6 Hz with constant amplitude of 0.025 m. The evaporation of liquid from the interface and the gaseous condensation was quantified by calculating the instantaneous interfacial mass transfer rate of the slow moving tank. The dependence of interfacial mass transfer rate on the liquid–vapor interfacial temperature, the fractional concentration of the evaporating liquid, the surface area of the liquid vapor interface and the filling level of the liquid was established. As sway frequency, filling levels, and liquid temperature increased, the interfacial mass transfer rate also increased. The interfacial mass transfer rate estimated for the swaying tank compared with the interfacial mass transfer rate of stationary tank shows that vibration increases the mass transfer.

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References

Figures

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Fig. 1

Diffusion of water vapor through air between two planes y1 and y2

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Fig. 2

Schematic setup of instrumented tank: 1. Thermocouples, 2. conductivity probe at various test filling levels and top, 3. humidity sensing probe, 4. pressure transducer for measuring ullage pressure, 5. cartridge heaters, and 6. hexapod

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Fig. 3

Schematic of the experimental setup with position of moisture sensing probe

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Fig. 4

Layout of the experimental setup: 1. Constant temperature bath (container), 2. K-type thermocouples series, 3. conductivity probe, 4. pressure transducer, 5. temperature controller, 6. heater assembly, 7. humidity meter astable multivibrator, 8. ultrasonic probe, and 9. hexapod

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Fig. 5

Standing wave generation by swaying liquid at 30 °C with amplitude 0.025 m and frequency 0.7 Hz

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Fig. 6

Interfacial mass transfer variation at 10% filling level and 30 °C for different sway frequencies

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Fig. 7

Ullage height variation for10% filling level tank swaying at 0.7 Hz frequency

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Fig. 8

Interfacial mass transfer variation with filling levels at 30 °C and 0.7 Hz sway frequency

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Fig. 9

Interfacial mass transfer variation with temperature for 10% filling level and 0.7 Hz sway frequency

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Fig. 10

Model of the heat and mass transfer in the tank with characteristic zones

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