Effects of Surface Tension on Void Fraction in a Multiple-Channel Simplifying Triangle Tight Lattice Rod Bundle-Measurement and Analysis

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概要

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• In order to know the effects of reduced surface tension on void fraction, adiabatic experiments were conducted for both air-water and air-water with surfactant systems at room temperature and pressure. Void fraction data were obtained for bubbly, slug, churn and annular flows in a vertical channel with two subchannels simplifying a triangle tight lattice rod bundle. The void fraction was found to be lower in air-water system than air-water with surfactant one. In addition, the void fractions for both systems were found to be lower than those calculated by various correlations in literatures for circular pipe flow.In order to study the cause of the above data trend, for annular flows, the void fraction has been calculated by a subchannel analysis using wall and interfacial friction correlations in literatures as constitutive equations, and by assuming the liquid film to be uniform over the wall perimeter. The best agreement between the calculation and the experiment has been obtained when NASCA correlation for wall friction force and modified RELAP5/MOD2 correlation incorporating reduced surface tension effects for interfacial friction force were used.

• 一般社団法人 日本機械学会の論文

著者

• KUDO Hiroyuki

  Dept. of Electronics and Communication Engineering, Waseda University

• Sadatomi Michio

  Dept. Of Advanced Mechanical Systems Kumamoto Univ.

• Kawahara Akimaro

  Dept. Of Advanced Mechanical Systems Kumamoto Univ.

• KAWAHARA Akimaro

  Dept. of Mechanical System Engineering, Graduate School of Science & Technology, Kumamoto University

• SHIRAI Hiroshi

  Dept. of Mechanical System Engineering, Graduate School of Science & Technology, Kumamoto University

• SADATOMI Michio

  Dept. of Mechanical System Engineering, Graduate School of Science & Technology, Kumamoto University

• SHIRAI Hiroshi

  Dept. of Mechanical System Engineering, Graduate School of Science & Technology, Kumamoto University

関連論文

• TESを用いた高分解能X線マイクロカロリーメータの開発
• H207 MODELING OF VOID DIFFUSION COEFFICIENT IN A TWO-PHASE SUBCHANNEL FLOW(BWR thermal hydraulics)
• B304 EFFECTS OF REDUCED SURFACE TENSION ON TWO-PHASE GAS-LIQUID FLOWS IN HORIZONTAL SMALL DIAMETER PIPES(Multiphase Flow-2)
• Prediction of Gas-Liquid Two-Phase Slug Flow Characteristics in Vertical Small Diameter Pipes by a One-Dimensional Two-Fluids Model
• Effects of Surface Tension on Void Fraction in a Multiple-Channel Simplifying Triangle Tight Lattice Rod Bundle-Measurement and Analysis

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