Netsu Bussei
Online ISSN : 1881-414X
Print ISSN : 0913-946X
ISSN-L : 0913-946X
Volume 27 , Issue 1
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  • Akitoshi Mizuno, Mitsuhiro Tannno, Ryutaro Takahashi, Hiroya Kawauchi, ...
    2014 Volume 27 Issue 1 Pages 3-8
    Published: 2014
    Released: December 31, 2014
    JOURNALS FREE ACCESS
    In order to elucidate a link between the concentration dependence of molar volume and structure of liquid Fe-Si alloys, synchrotron x-ray diffraction experiments have been conducted with the use of a conical nozzle levitation technique. Structure factors of liquid Fe-Si alloys with the concentration from 33 to 70 at.% Si indicate a correlation of medium range ordering as well as a short range ordering in the liquid alloy resulted from a strong interaction between Fe and Si atoms. Although the total molar volume increases with the increase of the Si content, the concentration dependence of the average interatomic distance shows a minimum around 80 at.% Si content. These results were discussed taking into account the formation of anisotropic bonds between Fe and Si atoms, which may induce a spatial expansion in the microscopic scale.
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  • Kazumichi Kobayashi, Shingo Mouri, Yusuke Watanabe, Masao Watanabe, Sh ...
    2014 Volume 27 Issue 1 Pages 9-14
    Published: 2014
    Released: December 31, 2014
    JOURNALS FREE ACCESS
    The growth rate of a liquid film formed on a shock-tube endwall due to condensation of methanol vapor behind a shock wave reflected at the endwall is measured by an optical interferometer at room temperature, and it is analyzed with the aid of molecular gas dynamics in order to deduce evaporation and condensation coefficients. The measurements are done in the region of 1 ≤σ / ρ*<1.3, where σ / ρ* is nonequilibrium degree. The condensation coefficient is almost the same value as the evaporation coefficient (=0.86) in 1 ≤σ / ρ* <1.05 and decreases to the smaller values than the evaporation coefficient in σ / ρ*1.05, and the kinetic boundary condition is valid in 1 ≤σ / ρ*<1.05.
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  • Masayoshi Sugimoto, Manami Sato, Masahiro Hasegawa, Kazuya Kominami, S ...
    2014 Volume 27 Issue 1 Pages 15-20
    Published: 2014
    Released: December 31, 2014
    JOURNALS FREE ACCESS
    In the recent years, the “urban heat island phenomenon” has constituted a menace to the general population. Hence, we propose the improvement of the thermal performance of a building envelope through the use of a reed screen that does not require the consumption of oil-based chemical products. Reed beds have contributed greatly to the conservation of the environment of wetlands. It has been thought recently that we cannot expect the effects of this environment protection to continue, because the demand for reeds has presently decreased. However, sheathing a building envelope with a reed screen not only suppresses waste heat emission from air conditioners, but also helps to conserve the environment of the wetlands. As a result, we can reduce the urban environment impact. We present a procedure that can be used to determine the reflection of solar radiation by a reed screen with reference to experiment data recorded on the roofs of mid-rise buildings. Additionally, we measured the thermal conductance of a reed screen according to JIS A1414-2, A-1420.
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  • Kiyotsugu Kano
    2014 Volume 27 Issue 1 Pages 21-26
    Published: 2014
    Released: December 31, 2014
    JOURNALS FREE ACCESS
    A pulse laser is used as a heating source in the laser flash method which is well known measurement method of the thermal diffusivity. In this paper we consider to substitute the semiconductor laser as a heating source for the pulse laser. But in this case, input waveform to a sample is the transient rectangular periodic wave pattern, and the analytic solution to reaction wave pattern is not found immediately. However, it is shown that the numerical value solution of the response wave pattern is easily obtained by use of the high-speed Laplace inverse transformation (FILT) which developed by Hosono. Furthermore, it is able to identify the thermal conductivity as well as a thermal diffusivity of the sample by use of this numerical value solution, subject to the magnitude of input heat flux is known. And it is touched that the general-purpose program of FILT can be written by using the C++ of a programming language. We simulated the identity method for single and two-layer sample to confirm the validity of the method.
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