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舩津, 賢人 ; 糟谷, 紘一 ; 白井, 紘行
概要:
application/pdf<br />Journal Article<br />We calculated the flow-field and surface response condition of a planetary probe entering the Jupiter atmosphere, Within the region behind a detached shock wave, the blunt nose is heated to high
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temperature. So that, the numerical results were obtained under a viscous-shock-layer analysis. To protect the probe against high temperature condition and to reduce the heat flux, which includes convectional and radiative heat transfer, we used the ablation of C/C composite materials. This simulation included mass injection, radiative transfer, diffusion, and viscous effects. The radiations included were molecular bands, atomic lines, and continuum processes. It was found that carbon ablation materials were effective in reducing the radiative heat flux.
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新井, 雅隆 ; 天谷, 賢児
概要:
application/pdf<br />Journal Article<br />Droplet evaporation on a hot surface under super-gravitational fields was experimentally inves tigated. A test chamber attached to the end of a rotating arm was constructed to produce the
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quasi-super-gravitational fields. A hot surface, droplet-forming equipment and a video camera for measuring the lifetime of a droplet were installed in a test chamber. Lifetime curves of water, n-decane and benzene were measured under the gravity of G = 1 to 12. As a result, it was found that an increase of the gravitational acceleration led to the decrease of lifetime near the Leidenfrost point.
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INADA, Shigeaki ; MIYASAKA, Yoshiki ; SAKUMOTO, Masakazu
概要:
application/pdf<br />Journal Article<br />This report describes liquid-solid contact behavior in the subcooled pool transition-type boiling regime and the minute bubble emission boiling regime, detected by a void probe that uses a
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series-resonance circuit. This probe can approach the heated surface within two to three micrometers. The liquid-solid contact state discussed in this report means the nucleate boiling state caused by liquid invasion or Leidenfrost state caused by liquid rush onto the dry part on the heated surface. The dried area on the heated surface was estimated on the basis of the void signal, and the relation between the dried area on the heated surface and the measured heat flux was clarified by introducing a nucleate boiling model.
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INADA, Shigeaki ; MIYASAKA, Yoshiki ; SAKAMOTO, Kenji
概要:
application/pdf<br />Journal Article<br />The heat flux was measured at the second burnout point of pool boiling over the range of high subcooling of 30 K to 88 K, under atmospheric pressure. The relation between the heat flux and
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subcooling was obtained by a mathematical model based on the mass-transfer mechanism of evaporation and condensation through a coalescent vapor bubble, and by a kinetic theory of molecules. The relationship equation gave fairly good agreement with the experimental results and showed that the second burnout heat flux did not increase unlimitedly with subcooling, but that it had a maximum value at a certain subcooling.
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