Variability in coefficient of restitution in human facial skin
Published Date:Mar 17 2014
Source:Skin Res Technol. 20(3):355-362.
Coefficient Of Restitution
Reproducibility Of Results
Sensitivity And Specificity
Skin Physiological Phenomena
Pubmed Central ID:PMC4753564
Funding:R01 OH009290/OH/NIOSH CDC HHS/United States
R01OH009290-01/OH/NIOSH CDC HHS/United States
T42OH00849/OH/NIOSH CDC HHS/United States
If particles rebound on human facial skin, they can be re-entrained into the airflow and subsequently inhaled, increasing aspiration efficiency estimates. A realistic estimate of facial skin coefficient of restitution (CoR) is necessary to accurately model particle bounce. This study investigated the effects of sampling location, temperature, humidity levels, age, gender, and BMI on facial skin CoR.
A torsional ballistometer was used to measure facial CoR for 30 participants divided into three age groups (18–30, 31–40, and 41–65 years), at three temperatures and three humidity levels. The study was repeated twice: once in the late winter and once in the early summer to capture the seasonal variability.
The CoR significantly varied across five facial locations, with values ranging from 0.55 to 0.75. Gender, sampling season and the interaction between sampling location and age were found to be significant, but changes in values were relatively small (0.05 at most) and are not considered practically significant.
CoR was non-uniform across the face. The use of uniform CoR value as modeling input parameters or for mannequin facial surfaces in experimental wind tunnel studies may not be accurate due to the high variability in CoR between facial sampling locations.
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