Human Body Regional Convective Heat Transfer Determination Using Sublimating Naphthalene Disks.

摘要

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 mannequin, 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. Keywords; Heat transfer coefficients; Convective heat transfer; Heat-mass transfer analogy; Naphthalene disk sublimation; Body temperature. (kt)