Netsu Bussei
Online ISSN : 1881-414X
Print ISSN : 0913-946X
ISSN-L : 0913-946X
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Volume 19, Issue 2
Displaying 1-3 of 3 articles from this issue
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paper
  • Thermophysical Properties of Molten Tungsten Measured with an Electrostatic Levitator
    Takehiko Ishikawa, Paul-François Paradis, Ryuichi Fujii, Shinic ...
    2005 Volume 19 Issue 2 Pages 61-66
    Published: April 30, 2005
    Released on J-STAGE: October 27, 2008
    DOIhttps://doi.org/10.2963/jjtp.19.61
    JOURNAL FREE ACCESS
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    Thermophysical properties of liquid and supercooled tungsten were measured using non-contact techniques in combination with an electrostatic levitator. As the results of the present measurements over the temperature range of 3125-3707 K, the density is expressed as ρ(T) =16.7(±0.33)x10³-1.08(±0.08) (kg⋅m-3) with Tm=3695 K. The volume expansion coefficient was also expressed as 6.6 x 10-5 K-1. In addition, the surface tension is expressed as γ(T) =2.48x103(±75)-0.31(±0.08)(T-Tm) (10-3N⋅m-1) over the 3398-3695 K span and the viscosity is expressed as η(T) =0.11(±0.02)exp[12.8(±4.1)x104/(RT)] (10-3Pa⋅s) over the temperature range of 3398-3695 K.
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  • Viscosity Measurements of Ethylene Glycol Solution with Flow Drag Reduction Additives
    Naoto Haruki, Hideo Inaba, Akihiko Horibe, Shinji Tanaka
    2005 Volume 19 Issue 2 Pages 67-72
    Published: April 30, 2005
    Released on J-STAGE: October 27, 2008
    DOIhttps://doi.org/10.2963/jjtp.19.67
    JOURNAL FREE ACCESS
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    This paper has dealt with the viscous characteristics of ethylene glycol (EG) solution with flow drag reduction additive. In this study, oleyldihydoroxyetylamineoxide (ODEAO) was used as the flow drag reduction additive, and aqueous solution of EG was used as a secondary refrigerant. The viscosity of EG solution with ODEAO was measured with a rotary rheometer. The experimental pa-rameters of viscosity measurement were temperature of the ODEAO brine, the ODEAO concentra-tion and the EG concentration. From the experimental results, the apparent viscosity of EG solution with ODEAO showed SIS (= the shear induced state). Therefore, the non-linear dependence of shear stress on shear rate was well approximated by the Power-law model under the high shear condition, and pseudoplastic viscosity and index number in each experimental parameter were estimated. And the non-dimensional analysis for flow drag and heat transfer reduction effect of EG solution with ODEAO has been investigated by using this approximation.
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  • Apparent Thermal Conductivity of Power Stretch Knitted Fabrics for Women’s Foundation Garments under Dry and Wet Conditions
    Noriko Nakamura, Harumi Morooka, Hideo Morooka
    2005 Volume 19 Issue 2 Pages 73-78
    Published: April 30, 2005
    Released on J-STAGE: October 27, 2008
    DOIhttps://doi.org/10.2963/jjtp.19.73
    JOURNAL FREE ACCESS
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    Influences of the moisture or water adsorption of materials, weave construction and processing of power stretch knitted fabrics for women’s foundation garments on apparent thermal conductivity were examined under dry and wet conditions. The apparent thermal conductivity of the fabrics depend on the thermal conductivity, partial volume, and the moisture regain of fibers and the thickness of fabrics. There is no effect of processing on thermal conductivity. Moisture regain of fibers and weave construction influence the thermal conductance of fabrics under humid conditions, while the apparent density of fabrics and moisture regain of fibers affect thermal conductance under wet conditions.
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