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Interfacial Phenomena and Heat Transfer

Выходит 4 номеров в год

ISSN Печать: 2169-2785

ISSN Онлайн: 2167-857X

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VOID FRACTION CHARACTERISTICS OF ONE-COMPONENT GAS−LIQUID TWO-PHASE FLOW IN SMALL DIAMETER TUBES

Том 4, Выпуск 1, 2016, pp. 1-18
DOI: 10.1615/InterfacPhenomHeatTransfer.2016015746
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Краткое описание

When designing a two-phase flow loop system for space structures, it is necessary to understand the effect of surface tension on the gas−liquid two-phase flow behaviors. In this paper, the effect of the tube diameter on the void fraction characteristics of vertical upward one-component gas−liquid two-phase flows in small diameter (inner diameter = 4.0, 2.0,1.1, and 0.5 mm) circular tubes is discussed. FC-72 was used as the working fluid. The void fraction was measured by a capacitance method and the flow behaviors were observed simultaneously using a high-speed camera. The transition boundaries of the observed flow pattern agreed well with the Mishima and Ishii model, except in the case of the 0.5 mm tube. The gas volumetric flux at the transition from slug to annular flow for the 0.5 mm tube was higher than that obtained by the previous model. For the annular flow, the average void fractions were overestimated by the homogeneous model and Cioncolini and Thome model due to the high slip ratio. In the correlation based on the drift−flux model, the distribution parameter for the annular and churn flows in each tube agreed well with the Zuber annular flow model and the Ishii churn flow model, respectively. The drift velocities were overestimated by these models, except in the case of the 4.0 mm tube. The disturbance wave frequency for annular flow increased when the tube diameter was decreased to 1.1 mm; however, for the 0.5 mm tube the frequency decreased due to enhancement of the surface tension effect.

ЦИТИРОВАНО В
  1. Kubo Yohei, Yamada Sayaka, Murakawa Hideki, Asano Hitoshi, Pressure drop and flow patterns of boiling flows in Mini-Channels with Semi-Circular Cross-Section, Applied Thermal Engineering, 194, 2021. Crossref

  2. Krupa Andrzej, Lackowski Marcin, Jaworek Anatol, Capacitance sensor for measuring void fraction in small channels, Measurement, 175, 2021. Crossref

  3. Sukamta , Sudarja , Sundari Sri, Comparison of Void Fraction on Annular and Churn Two-Phase Flow Patterns in Mini Pipe with a Slope of 15° Against Horizontal Position, IOP Conference Series: Materials Science and Engineering, 1063, 1, 2021. Crossref

  4. HIKITA Masatoshi, YAMAKITA Takaya, ASANO Hitoshi, Study on Void Fraction Characteristics of Gas-Liquid Two-Phase Flows in Horizontal Non-Circular Small Diameter Channel, JAPANESE JOURNAL OF MULTIPHASE FLOW, 36, 1, 2022. Crossref

  5. Ayegba Paul Onubi, Sebilleau Julien, Colin Catherine, Hydrodynamics of vertical upward and downward flow boiling in a millimetric tube, International Journal of Multiphase Flow, 153, 2022. Crossref

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