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Related Experiment Videos

Dynamic moisture permeation through clothing.

N Kakitsuba1, K Gaul, H Michna

  • 1School of Kinesiology, Simon Fraser University, Burnaby, British Columbia, Canada.

Aviation, Space, and Environmental Medicine
|January 1, 1988
PubMed
Summary

This study introduces a new device to measure moisture movement in clothing during temperature changes. It helps understand how sweat evaporation from skin (Esk) and clothing (Ecl) interact, crucial for thermal comfort.

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Area of Science:

  • Textile science
  • Human physiology
  • Thermal comfort engineering

Background:

  • Dynamic moisture permeation through clothing impacts thermal balance during temperature fluctuations.
  • Imbalances between skin (Esk) and clothing surface (Ecl) evaporation affect comfort and heat loss.
  • Understanding moisture transport is key for designing effective protective garments.

Purpose of the Study:

  • To develop and validate a device for simultaneous measurement of Esk and Ecl.
  • To investigate dynamic moisture permeation in different helicopter pilot suits under varying temperatures.
  • To analyze the relationship between fabric properties and moisture transport dynamics.

Main Methods:

  • A novel device utilizing relative humidity sensors and thermistors to calculate water vapor densities.

Related Experiment Videos

  • Application of Fick's law of diffusion to estimate local evaporation rates.
  • Simultaneous measurement of Esk and Ecl at chest, arm, and thigh across temperatures (20-40°C) for four suit types.

    • Main Results:

    • Observed distinct patterns in Esk and Ecl for permeable, hygroscopic fabrics (Goretex, cotton ventile).
    • Identified rapid Esk increase, followed by decay, and gradual Ecl increase, linked to sweating, moisture buildup, and fabric water absorption.
    • Demonstrated variations in moisture permeation based on suit material and ambient temperature.

    Conclusions:

    • The developed device effectively monitors dynamic moisture permeation through clothing.
    • Findings provide insights into the complex interplay of sweating, fabric properties, and thermal regulation.
    • The device shows potential for evaluating garment performance in thermal transient conditions.