The influence of flow rate on inter-nucleation site heat transport

C.H.M. Baltis, C.W.M. van der Geld

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    Abstract

    The main topic of this paper is the influence of vertically aligned nucleation sites on each other in upward flow boiling. A setup was constructed to facilitate vertical up-flow of deminiralized water under saturation conditions. The main test section is a glass channel with a set of vertically aligned bubble generators. Each bubble generator is operated independently, where power and wall temperature are registered and the vapour bubbles are visualized by a high-speed camera. During the experiments, the downstream bubble generator (BG1) power is kept constant, while the power fed to the upstream bubble generator (BG2) is incrementally increased. Two main trends have been identified. The first trend is dominated by added convection from one site to the other. Both bubble frequency and detachment diameter on BG1 increase with increased power fed to upstream BG2. This effect decreases with increasing inter-site distance and becomes more significant with increasing liquid flow rate. When vapor bubbles start nucleating from BG2, these vapor bubbles inhibit bubble nucleation BG1 and can even lead to deactivation of this nucleation site. This second trend is only weakly dependent on inter-site distance, since the inhibition originates from bubbles flowing past BG1 in close proximity.
    Original languageEnglish
    Article number01004
    Number of pages8
    JournalMATEC Web of Conferences
    Volume18
    DOIs
    Publication statusPublished - 2014
    Event101 EUROTHERM Seminar – Transport Phenomena in Multiphase Systems ) - Krakow, Poland
    Duration: 30 Jun 20143 Jul 2014

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