Visual analysis of flow boiling at different gravity levels in 4.0 mm tube

C.M. Valencia-Castillo, G.P. Celata, L. Saraceno, G. Zummo

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2 Citations (Scopus)

Abstract

The aim of the present paper is to describe the results of flow boiling heat transfer at low gravity and compare them with those obtained at earth gravity, evaluating possible differences. The experimental campaigns at low gravity have been performed during the parabolic flight campaign of October-November 2013. The paper will show the analysis of differences between the heat transfer coefficients and vapour bubble parameters at normal and at zero gravity. The results of 4.0 mm tube are presented and discussed. With respect to terrestrial gravity, heat transfer is systematically lower at microgravity in the range of the experimental conditions. Heat transfer differences for the two gravity conditions are related to the different bubble size in each of them. The size of a bubble in flow boiling is affected by the gravity level, being larger at low gravity, unless inertial forces are largely predominant over buoyancy and other forces acting on the bubble itself when detaching from a heated wall. Vapour bubble parameters (bubble diameter, bubble length, width, and nose velocity) have been measured.
Original languageEnglish
DOIs
Publication statusPublished - 2014
Event32nd Italian Union of Thermo-Fluid-Dynamics Heat Transfer Conference, UIT 2014 - Pisa, Italy
Duration: 1 Jan 2014 → …

Conference

Conference32nd Italian Union of Thermo-Fluid-Dynamics Heat Transfer Conference, UIT 2014
CountryItaly
CityPisa
Period1/1/14 → …

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All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

Valencia-Castillo, C. M., Celata, G. P., Saraceno, L., & Zummo, G. (2014). Visual analysis of flow boiling at different gravity levels in 4.0 mm tube. Paper presented at 32nd Italian Union of Thermo-Fluid-Dynamics Heat Transfer Conference, UIT 2014, Pisa, Italy. https://doi.org/10.1088/1742-6596/547/1/012029