Air Permeability of Sports Fabrics at Running Speeds
| Autor: | Nate Demarest, Peter M. Ostafichuk, Jorge E. Carbo, Len Brownlie |
|---|---|
| Jazyk: | angličtina |
| Předmět: |
Flow visualization
Atmospheric pressure integumentary system Acoustics air permeability Airflow technology industry and agriculture General Medicine breathable fabrics Torso athletic apparel Wind speed law.invention medicine.anatomical_structure Pressure measurement law Air permeability specific surface medicine Environmental science Engineering(all) Simulation Wind tunnel |
| Zdroj: | Procedia Engineering. :697-702 |
| ISSN: | 1877-7058 |
| DOI: | 10.1016/j.proeng.2014.06.118 |
| Popis: | To measure fabric permeability over the body at air velocities encountered in running, a series of air pressure measurements were conducted on a mannequin torso in a wind tunnel. Pressure measurements were made at wind speeds of 3.3 m/sec, 5.3 m/sec and 10.0 m/sec from 15 pressure taps that ringed the circumference of the mannequin torso. The pressure measurements were then repeated at the two higher velocities when the pressure taps were covered in one of five fabrics commonly used for sports apparel. Each of the fabrics are considered highly permeable, based on an air permeability rating provided by the fabric manufacturer. The goals of the pressure measurements were: (1) to quantify the ability for air to be transmitted through a garment to an athlete's skin when the athlete is running; and (2) to compare the pressure tap measurements with the manufacturers’ air permeability ratings. The pressure measurements indicated that the only areas of the torso that encounter measurable airflow at wind velocities up to 10 m/sec are the flanks, a phenomenon also observed during dye-injection flow visualization studies conducted on a torso model in a water flume. Covering portions of the torso that receive very little airflow with any fabric further subdued the incoming airflow and the reduction in airflow was not consistently correlated with the fabric air permeability rating. The results of this study suggest that fabric air permeability ratings are of limited utility in the selection of permeable materials for running apparel because of the low air pressures encountered by the torso at running velocities. |
| Databáze: | OpenAIRE |
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