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The Influence of Gravity and Confinement on Marangoni Flow and Heat Transfer Around a Bubble in a Cavity: A Numerical Study

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Abstract

Marangoni thermocapillary convection and its contribution to heat transfer during boiling has been the subject of some debate in the open literature. Despite extensive research efforts there still remains insufficient quantitative information regarding the impact of thermocapillary flow on the heat transfer. As a result, this paper aims to present a numerical investigation of the heat transfer enhancement due to Marangoni thermocapillary convection under both earth gravity (1-g) and zero gravity (0-g) conditions. A hemispherical bubble of fixed shape is considered atop a heated top wall of a domain with variable height. The heat transfer enhancement is quantified for Marangoni numbers in the range of 100 ≤ Ma ≤ 3,000 for channel heights of 1.5 ≤ H/Rb ≤ 7.5 which, for the 1-g cases, correspond with a Raleigh number range of 51 ≤ RaH ≤ 6.5 × 104. For the most confined cases the flow and heat transfer were found to be very similar for the 0-g and 1-g cases. Also, the 0-g test cases were found to be very sensitive to increasing domain height whereas the 1-g simulations were far less sensitive.

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  1. Department of Mechanical and Manufacturing Engineering, Trinity College Dublin, Parsons Building, Dublin 2, Dublin, Ireland

    Cristina Radulescu & Anthony J. Robinson

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  1. Cristina Radulescu
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  2. Anthony J. Robinson
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Correspondence to Cristina Radulescu.

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Radulescu, C., Robinson, A.J. The Influence of Gravity and Confinement on Marangoni Flow and Heat Transfer Around a Bubble in a Cavity: A Numerical Study. Microgravity Sci. Technol 20, 253–259 (2008). https://doi.org/10.1007/s12217-008-9034-3

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  • DOI: https://doi.org/10.1007/s12217-008-9034-3

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