Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Experiment Videos

Image processing methods to obtain symmetrical distribution from projection image.

H Asano1, N Takenaka, T Fujii

  • 1Department of Mechanical Engineering, Kobe University, 1-1, Rokodai-Cho, Nada-ku, Kobe 657-8501, Japan. asano@mech.kobe-u.ac.jp

Applied Radiation and Isotopes : Including Data, Instrumentation and Methods for Use in Agriculture, Industry and Medicine
|July 13, 2004
PubMed
Summary
This summary is machine-generated.

Related Concept Videos

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Erratum: Centrality-Dependent Modification of Jet-Production Rates in Deuteron-Gold Collisions at sqrt[s_{NN}]=200  GeV [Phys. Rev. Lett. 116, 122301 (2016)].

Physical review letters·2025
Same author

Measurement of Direct-Photon Cross Section and Double-Helicity Asymmetry at sqrt[s]=510  GeV in p[over →]+p[over →] Collisions.

Physical review letters·2023
Same author

Measurements of Strong-Interaction Effects in Kaonic-Helium Isotopes at Sub-eV Precision with X-Ray Microcalorimeters.

Physical review letters·2022
Same author

Probing Gluon Spin-Momentum Correlations in Transversely Polarized Protons through Midrapidity Isolated Direct Photons in p^{↑}+p Collisions at sqrt[s]=200  GeV.

Physical review letters·2021
Same author

S-1 and oxaliplatin versus tegafur-uracil and leucovorin as post-operative adjuvant chemotherapy in patients with high-risk stage III colon cancer: updated 5-year survival of the phase III ACTS-CC 02 trial.

ESMO open·2021
Same author

Erratum: Evolution of π^{0} Suppression in Au+Au Collisions from sqrt[s_{NN}]=39 to 200 GeV [Phys. Rev. Lett. 109, 152301 (2012)].

Physical review letters·2020
Same journal

Proton-beam profiling using radiophotoluminescent glass-based hybrid radiation monitoring system.

Applied radiation and isotopes : including data, instrumentation and methods for use in agriculture, industry and medicine·2026
Same journal

Hydrogeochemical investigation of uranium and radon in groundwater and age-dependent radiological health risk assessment in Sulaymaniyah Governorate, Iraq.

Applied radiation and isotopes : including data, instrumentation and methods for use in agriculture, industry and medicine·2026
Same journal

High-accuracy prediction of Kβ/Kα intensity ratios via explainable stacked-ensemble learning: A web-based computational tool.

Applied radiation and isotopes : including data, instrumentation and methods for use in agriculture, industry and medicine·2026
Same journal

Comparative evaluation of <sup>67</sup>Ga production via the <sup>67</sup>Zn and <sup>68</sup>Zn routes on proton cyclotrons: Yield, radionuclidic purity, and cooling-time behavior.

Applied radiation and isotopes : including data, instrumentation and methods for use in agriculture, industry and medicine·2026
Same journal

Effect of BaO-TiO<sub>2</sub> compositional variation on radiation shielding properties of borate-based glasses: A computational and simulation study.

Applied radiation and isotopes : including data, instrumentation and methods for use in agriculture, industry and medicine·2026
Same journal

Habitat heterogeneity analysis of planning CT improves the prediction of radiation proctitis in cervical cancer: A multimodal machine learning study.

Applied radiation and isotopes : including data, instrumentation and methods for use in agriculture, industry and medicine·2026
See all related articles

This study visualizes gas-liquid two-phase flow, measuring void fraction distribution to understand how obstacles affect heat transfer. Two projection-based methods, Abel transform and CT, were successfully applied to vertical upward air-water flow.

Area of Science:

  • Fluid Dynamics
  • Heat Transfer
  • Two-Phase Flow

Background:

  • Understanding gas-liquid two-phase flow is crucial for optimizing heat transfer and flow characteristics in conduits.
  • Obstacles significantly influence flow patterns and heat transfer efficiency.
  • Accurate measurement of cross-sectional liquid distribution is key to analyzing these effects.

Purpose of the Study:

  • To apply and evaluate two projection-based methods for measuring cross-sectional void fraction distribution.
  • To investigate the impact of obstacles on gas-liquid two-phase flow characteristics.
  • To clarify the relationship between flow distribution and heat transfer.

Main Methods:

  • Application of Abel transform for calculating radial void fraction distributions in axially symmetric geometries (circular tube, annulus with spacer).

Related Experiment Videos

  • Utilizing the CT method for measuring cross-sectional void fraction distributions in a tube with a periodically rotating wire coil.
  • Both methods rely on single-direction projection images.

    • Main Results:

    • Successfully obtained radial void fraction distributions using Abel transform under axial symmetry assumption.
    • Successfully measured cross-sectional void fraction distributions using CT method for rotating configurations.
    • Demonstrated the effectiveness of both methods in characterizing void fraction distribution.

    Conclusions:

    • Projection-based methods are effective for visualizing and measuring cross-sectional void fraction in gas-liquid two-phase flow.
    • Abel transform and CT methods provide valuable data for understanding flow behavior and heat transfer modifications caused by obstacles.
    • The study highlights the utility of these techniques for analyzing complex two-phase flow phenomena.