Human Body Regional Convective Heat Transfer Determination Using Sublimating Naphthalene Disks

Abstract

The regional convective heat transfer coefficients(hc) on the human body were determined using sublimating naphthalene disks. Circular naphthalene disks were affixed to various body segments of a stationary, life-size manikin, under constant temperature and wind speed in an environmental chamber. The amount of naphthalene weight loss through sublimation was translated to hc using the Chilton-Colburn j-factor analogy between heat and mass transfer. The regional convective heat transfer coefficients can be determined by using strictly the heat-mass transfer analogy, excluding any supplementary technique of cylindrical body segment approximations or other shape extrapolations. The logarithmic mean density factor for naphthalene sublimating in air (PAM,n) was also determined. PAM,n for the naphthalene-air sublimation environment is only one third of the water vapor-air diffusion environment (Pam). Pam,n is an essential factor for extracting the correct hc value from the naphthalene mass transfer data.

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Document Details

Document Type
Technical Report
Publication Date
Jul 01, 1989
Accession Number
ADA212170

Entities

People

  • Chang Gonzalez
  • K. W. Stephen
  • Richard R. Gonzalez

Organizations

  • United States Army Research Institute of Environmental Medicine

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Body Weight
  • Coefficients
  • Environment
  • Equations
  • Heat Energy
  • Heat Of Sublimation
  • Heat Transfer
  • Heat Transfer Coefficients
  • Human Body
  • Mass Transfer
  • Measurement
  • Partial Pressure
  • Physical Properties
  • Security
  • Thermal Conductivity
  • Vapor Pressure
  • Water Vapor

Readers

  • Aerospace Engineering
  • Combustion and Flow Dynamics.
  • Fluid Dynamics.