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, Kouji Morita, Kenji Fukuda, Shu Hasegawa

Research output: Contribution to journalArticlepeer-review

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 - 1988

All Science Journal Classification (ASJC) codes

  • Nuclear Energy and Engineering

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