Unsteady Three-Dimensional Behavior of Natural Convection in Horizontal Annulus. (II). Flow Patterns in Range from Transition Region to Turbulence and Measurements of Turbulence Quantities

Yasutomi Miki, Toshizo Ohya, Koji Morita, Kenji Fukuda, Shu Hasegawa

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2 Citations (Scopus)

Abstract

The velocity and temperature distributions are measured for natural convection in a horizontal concentric annulus at high Rayleigh numbers with using a hot-wire anemometer and a thermocouple. Dealing with these data statistically, the average velocity and temperature profiles as well as their turbulence quantities are obtained. By carrying out the spectrum analysis of these velocity fluctuations, a transition from the laminar natural convection to the turbulent one is clarified. With increasing Rayleigh number, the stable flow pattern becomes unstable to a periodic one. The periodicity diminishes when the Rayleigh number is further increased. A comparison of these experimental data with the time-dependent three-dimensional numerical results, which were reported in our previous paper, shows a good agreement.

Original languageEnglish
Pages (from-to)172-180
Number of pages9
JournalJournal of the Atomic Energy Society of Japan / Atomic Energy Society of Japan
Volume30
Issue number2
DOIs
Publication statusPublished - Jan 1 1988

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Natural convection
Flow patterns
Turbulence
Anemometers
Thermocouples
Velocity distribution
Spectrum analysis
Temperature distribution
Wire
Temperature

All Science Journal Classification (ASJC) codes

  • Nuclear Energy and Engineering

Cite this

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abstract = "The velocity and temperature distributions are measured for natural convection in a horizontal concentric annulus at high Rayleigh numbers with using a hot-wire anemometer and a thermocouple. Dealing with these data statistically, the average velocity and temperature profiles as well as their turbulence quantities are obtained. By carrying out the spectrum analysis of these velocity fluctuations, a transition from the laminar natural convection to the turbulent one is clarified. With increasing Rayleigh number, the stable flow pattern becomes unstable to a periodic one. The periodicity diminishes when the Rayleigh number is further increased. A comparison of these experimental data with the time-dependent three-dimensional numerical results, which were reported in our previous paper, shows a good agreement.",
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T1 - Unsteady Three-Dimensional Behavior of Natural Convection in Horizontal Annulus. (II). Flow Patterns in Range from Transition Region to Turbulence and Measurements of Turbulence Quantities

AU - Miki, Yasutomi

AU - Ohya, Toshizo

AU - Morita, Koji

AU - Fukuda, Kenji

AU - Hasegawa, Shu

PY - 1988/1/1

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AB - The velocity and temperature distributions are measured for natural convection in a horizontal concentric annulus at high Rayleigh numbers with using a hot-wire anemometer and a thermocouple. Dealing with these data statistically, the average velocity and temperature profiles as well as their turbulence quantities are obtained. By carrying out the spectrum analysis of these velocity fluctuations, a transition from the laminar natural convection to the turbulent one is clarified. With increasing Rayleigh number, the stable flow pattern becomes unstable to a periodic one. The periodicity diminishes when the Rayleigh number is further increased. A comparison of these experimental data with the time-dependent three-dimensional numerical results, which were reported in our previous paper, shows a good agreement.

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