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Basic Research on the Characteristics of Cloths to Keep Warmth and Moisture Permeability

Research Project

Project/Area Number 03650174
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field Thermal engineering
Research InstitutionTokyo Institute of Technology

Principal Investigator

SAITO Akio  Tokyo Institute of Technology, Department of Mechanical Engineering, Professor, 工学部, 教授 (40020432)

Co-Investigator(Kenkyū-buntansha) OKAWA Seiji  Tokyo Institute of Technology, Department of Mechanical Engineering, Assistant, 工学部, 助手 (60201373)
Project Period (FY) 1991 – 1992
Project Status Completed (Fiscal Year 1992)
Budget Amount *help
¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1992: ¥200,000 (Direct Cost: ¥200,000)
Fiscal Year 1991: ¥1,800,000 (Direct Cost: ¥1,800,000)
KeywordsThermophysical Properties / Textile Fabrics / Keeping Warmth
Research Abstract

Experiments and analyses were done concerning the measurement of thermophysical properties of a textile fabrics, which were necessary for the basic discussions of the characteristics of cloths, such as keeping warmth and moisture permeability. Concerning a textile fabrics, the real thermal conductivity in a vacuum, the permeability, the porosity and the apparent thickness were measured precisely. On the bases of the above properties, the physical meaning of the thermal transmittance of the textile fabrics determined by the ASTM standard were discussed. Then, the possibility and the directions to improve the ASTM standard were suggested.
The following results were obtained in the financial year 1991.
1. On the bases of the transient flat-plate measuring method by O. Krischer, the apparatus to measure simultaneously the thermal penetration factor, the specific heat and the thermal conductivity of a textile fabrics both in a vacuum and in an air was constructed. And the measurements were done using the standard textile sample made of polyester.
2. An apparatus to measure precisely the permeability of a textile sample was proposed and constructed under the measuring condition of low stable fluid velocity, where the Darcy's law can be applied. Measurements were done using the standard textile sample.
3. An apparatus to measure the thermal transmittance was prepared on the instructions of the ASTM standard test method, and the measurements were done on the above textile sample. It was pointed out, as the problems of the test method, that the control of the guard heater to ensure the amount of heat supplied to the sample was impossibly difficult and that the modification of the natural convection effects over the textile sample was not adequate.
In the financial year 1992, the results obtained through the former year were discussed precisely and the contents were filled up.

Report

(3 results)
  • 1992 Annual Research Report   Final Research Report Summary
  • 1991 Annual Research Report
  • Research Products

    (3 results)

All Other

All Publications (3 results)

  • [Publications] 斎藤 彬夫: "布の透過率・測定法に関する研究" 第30回日本伝熱シンポジウム講演論文集. (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] A. Saito, S. Okawa and C. Liou: "Measurement of Air Permeability of Textile Material" 30th National Heat Transfer Symposium of Japan. (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] 斎藤 彬夫: "布の透過率測定法に関する研究" 第30回日本伝熱シンポジウム講演論文集. (1993)

    • Related Report
      1992 Annual Research Report

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Published: 1991-04-01   Modified: 2016-04-21  

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