Effect of heater size on ultrasonic enhancement of boiling in water and surfactant solutions

Mosyak, A.; Hetsroni, G.; Fichman, M.; Moldavsky, L.; Pogrebnyak, E.

doi:10.1016/j.ijmultiphaseflow.2015.11.005

Cited by 11 publications

(2 citation statements)

References 30 publications

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“…It was justified in reference of Hao et al 38 that bubble equilibrium radius is found 0.56 mm, 0.14 mm and 0.08 mm for 47, 140 and 185 kHz frequency respectively against departure radius of approximately 0.5 mm. Clearly lower frequency provided equilibrium radius 41 Frequency 25 and 45 kHz Water Improvement in CHF for screwed and finned tube approached to 41.89% and 29.12% respectively with respect to plain tube Hetsroni et al 42,43 Frequency 40kHz Ultrasonic intensity 50 kW/m 2 Water Improvement depends on ratio of inertia of the wire and relative magnitude of buoyancy vs. interface forces for the range of diameter 0.02 mm to 0.25 mm Mosyak et al 44 Frequency 40 kHz Average intensity 5 kW/m 2…”

Section: Effect Of Acoustic Parametersmentioning

confidence: 96%

“…Mosyak et al. 44 conducted experiments to find out the effect of ultrasonic field on water and surfactant solutions with different heating surface sizes. While usual decrease of wall superheat and improvement of heat transfer was shown in case of 50 µm diameter wire with pure water as well as surfactant solution.…”

Section: Parametric Studies Related To Ultrasonic Field Assisted Pool Boilingmentioning

confidence: 99%

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Ultrasonic augmentation in pool boiling heat transfer over external surfaces: A review

Swarnkar

Lakhera

2020

Proceedings of the Institution of Mechanical Engineers, Part C:

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Boiling heat transfer is known for high heat fluxes at relatively small temperature differences. However, over the decades, technological innovations have demanded further augmentation in heat fluxes associated with boiling. Among the various active and passive methods, use of ultrasonic waves in boiling liquid has emerged as a proven technique for the required heat transfer improvement as demonstrated by a number of researchers. The present article reviews the application of ultrasonic waves in enhancing the heat transfer in various regimes of pool boiling. It has been found that the use of ultrasonic field is more promising in case of sub-cooled boiling as compared to saturated condition. Along with ultrasonic field of lower frequency and higher power, the usage of various passive techniques of surface improvement such as micro channel, surface topology, nano coatings etc. leads to further augmentation of heat transfer. Also, the relative placement of heating surface in ultrasonic wave field must be considered inevitably while designing an ultrasonic field assisted pool boiling system. It requires further investigations to conduct more parametric studies such as effect of pressure along with the usage of ultrasonic waves during sub- cooled boiling. Also during ultrasonic assisted pool boiling, various nano fluids can be tested for improving the heat transfer characteristics particularly in the saturated nucleate boiling regime.

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