Dynamics of bubble departure

Eastman, R. E.

doi:10.2514/6.1984-1707

Cited by 5 publications

(4 citation statements)

References 1 publication

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“…This allows the bubble nucleate with a small radius ( r b ) to form bubbles and leave the solid/liquid interface. Therefore, at low surface temperature, a droplet with low surface tension make it easier for vapor bubble to generate and depart, resulting in more small and dense bubbles being formed in the droplet and the droplet has a lower OBD temperature (Figure b). At the same surface temperature, these bubbles form and depart quickly, leading to more intense boiling and higher boiling heat flux.…”

Section: Resultsmentioning

confidence: 99%

Enhancing Boiling Heat Transfer on a Superheated Surface by Surfactant-Laden Droplets

et al. 2022

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Boiling, one of the most common phase-change heat transfer methods, is widely used in nuclear power plants, spacecraft, integrated circuits, and other situations, where rapid and efficient heat transfer is crucial. However, boiling heat transfer is efficient only in a specific surface temperature range when a droplet impacts a superheated surface. Here, we enhance the boiling heat transfer and extend this temperature range by adding a tiny amount of surfactant. We find that surfactants can weaken the Kelvin effect of boiling bubbles, and thus reduce the onset of boiling driven temperature and significantly enhance the maximum vaporization rate of the droplet effectively. In particular, different from previous studies, we find that the surfactants at lower concentrations can increase the Leidenfrost temperature of the droplets. All the above effects jointly expand the temperature range of effective boiling heat transfer. This study sheds new light on the role of surfactants in the boiling process and offers a new medium to promote heat-transfer applications.

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Section: Resultsmentioning

confidence: 99%

Enhancing Boiling Heat Transfer on a Superheated Surface by Surfactant-Laden Droplets

et al. 2022

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“…where V b is the bubble departure velocity and is calculated by Eastman (1984) developed an analysis related to dynamics of bubble departure that is presented here. During nucleate boiling, the forces that hold the bubble to the wall (negative) are larger than the forces that pull the bubble from the wall (positive) when the bubble is very small.…”

Section: Chapter 10 Boiling 787mentioning

confidence: 99%

“…A very Figure 10.11 Forces acting on a vapor bubble growing on a heating surface (Eastman, 1984). In realistic applications, this force is negligible for most fluids.…”

Section: Chapter 10 Boiling 787mentioning

confidence: 99%