1988
DOI: 10.3327/jaesj.30.172
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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.

Abstract: The velocity and temperature distributions are measured for natural convection in a hor izontal 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 numbe… Show more

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Cited by 2 publications
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“…According to Bishop et al (1968) and Miki et al (1988) these indicators all seem to confirm that the first transition from steady to unsteady behaviour happens in a three-dimensional manner at Ra L 1.82 × 10 5 with a monoperiodic mode at very low frequency. For Ra L = 2.13 × 10 5 a second incommensurable frequency appears and it seems to take energy from the lower frequency, which tends to disappear.…”
Section: Introductionmentioning
confidence: 61%
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“…According to Bishop et al (1968) and Miki et al (1988) these indicators all seem to confirm that the first transition from steady to unsteady behaviour happens in a three-dimensional manner at Ra L 1.82 × 10 5 with a monoperiodic mode at very low frequency. For Ra L = 2.13 × 10 5 a second incommensurable frequency appears and it seems to take energy from the lower frequency, which tends to disappear.…”
Section: Introductionmentioning
confidence: 61%
“…Bishop et al (1968) also gave the correlation equations in terms of oscillating flow parameters (amplitude, period and wavelength) for a wide range of Gr and . They presented an exponential reduction of periodicity for increasing Gr with an exponent of 0.44 and this behaviour is qualitatively confirmed by the experimental work of Miki et al (1988) and by the numerical simulation of Ohya et al (1988). So, to our knowledge, no quantitative systematic studies are available in the literature which focus their attention on the mechanism of transition from steady state to chaotic behaviour in its initial stage.…”
Section: Introductionmentioning
confidence: 63%
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