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RISS 인기검색어
- 검색키워드
- 저자 : Deaton, Joshua D. (검색결과 5 건)
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Huipu Gao,Anthoney Shawn Deaton,Roger Barker,Emiel DenHartog,Xiaomeng Fang 한국섬유공학회 2022 Fibers and polymers Vol.23 No.11
Heat stress is a significant concern to firefighter health and is largely affected by the heat release properties ofprotective clothing. Air gaps exist in multi-layer firefighter clothing and have a great impact on body heat dissipation. In thisstudy, the effect of air gap size on heat loss through firefighter turnout composites in different ambient environments wasexplored with a specially designed hotplate system. Three firefighter turnout composites with different moisture barriers weretested in mild (25 °C) and hot environments (35 and 45 °C). Study findings showed the air layer’s thermal insulation andevaporative resistance increased up to a critical air gap size of about 15 millimeters when tested in mild condition due to theoccurrence of natural convection. When tested in hot environments, the insulation and evaporative resistance of air gap keptincreasing. The most significant finding was that air gaps together with ambient conditions affected the amount of moistureabsorption inside moisture barriers, which further influenced the evaporative resistance and evaporative heat loss offirefighter composites containing bi-component moisture barriers. In contrast, for fabric composites with microporousmoisture barrier, their evaporative resistance was relatively independent of air gap size and ambient conditions. The resultsfrom this study are useful for the modeling of heat transfer through firefighter clothing and are of great importance for thedesign of firefighter composites.
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A Novel Method for Measuring the Wet Cling Properties of Textiles
Huipu Gao,A. Shawn Deaton,Roger L. Barker 한국섬유공학회 2023 Fibers and polymers Vol.24 No.1
The human body sweats to release heat, and the presence of sweat may cause the sticking of fabric against skin, leading to astrong discomfort clingy perception or skin injuries. This paper describes a novel testing method designed to measure the wetcling frictional force between clothing fabrics and a wetted skin simulant. The developed methodology shows that sweatingrate, sweating time, and ambient air movement influence the build-up of frictional resistance to the movement of fabrics alongthe surface of a sweating skin simulant. The test method enables observation of the relationships between the measured wetcling force and the construction of a selected set of polyester and cotton knit fabrics having different moisture absorption,wicking, and drying properties. This analysis reveals that thin polyester jersey knits with excellent wicking, evaporative,and drying properties exhibit low levels of wet cling. On the other hand, thicker double-knit polyester construction canexhibit lower wet cling force when its inherently greater absorption capacity minimizes moisture build-up in the skin-fabricinterface. Cotton knits generally have higher wet cling resistance than polyester knits of similar thickness because of theirgreater capacity to retain moisture. The wet cling tester shows that moisture-related friction force is not present in knit fabricsthat incorporate a durable water repellent finish, demonstrating an alternative method to reduce wet cling. It also revealsthat one-way wicking fabrics reduce wet cling frictional force by transporting moisture away from the fabric–skin interface. These studies find no statistically significant correlations between standard measures of fabric moisture properties and wetcling force in this group of knit materials. This finding underscores the complex nature of the factors influencing wet clingperformance. It demonstrates the utility of the developed test methodology for measuring wet cling in different conditions.
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Allison, Darcy L.,Morris, Craig C.,Schetz, Joseph A.,Kapania, Rakesh K.,Watson, Layne T.,Deaton, Joshua D. Techno-Press 2015 Advances in aircraft and spacecraft science Vol.2 No.1
A modular multidisciplinary analysis and optimization framework has been built with the goal of performing conceptual design of an advanced efficient supersonic air vehicle. This paper addresses the specific challenge of designing this type of aircraft for a long range, supersonic cruise mission with a payload release. The framework includes all the disciplines expected for multidisciplinary supersonic aircraft design, although it also includes disciplines specifically required by an advanced aircraft that is tailless and has embedded engines. Several disciplines have been developed at multifidelity levels. The framework can be readily adapted to the conceptual design of other supersonic aircraft. Favorable results obtained from running the analysis framework for a B-58 supersonic bomber test case are presented as a validation of the methods employed.
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