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1. The relationship between clothing styles and local ease distributions | |||
ZHANG Zhaohua,Yu Weiying,Deng Yun,Xu Lulin,Zhao Wenshuo | |||
Textile Science and Technology 27 March 2016 | |||
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Abstract:To investigate the effect of fashion style on ease distributed features in different body parts and orientations, three female shirts with same size specifications but different silhouettes are designed. Seven female participants whose body shape are similar to Chinese garment size standard are scanned by three dimensional human body scanner both with and without experimental shirts. The ease distribution of three shirts is measured and analysed by using Geomagic Qualify software. The results show that ease distribution of most body parts can be influenced by garment styles except the upper back and chest. Ease allowance are not evenly distributed in different orientations of body parts, it tends to be lager at lateral body than at medial. This knowledge can be applied to pattern design for better fitness. | |||
TO cite this article:ZHANG Zhaohua,Yu Weiying,Deng Yun, et al. The relationship between clothing styles and local ease distributions[OL].[27 March 2016] http://en.paper.edu.cn/en_releasepaper/content/4682305 |
2. Thermal Protection Evaluation of Fire Fighter Ensembles based on a Flame Test Manikin System | |||
Li Jun,Li Xiaohui,Wang Min | |||
Textile Science and Technology 11 July 2013 | |||
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Abstract:Objective and quantitative evaluation of clothing thermal protective properties should be based on the simulation of human in actual thermal environment as realistic as possible. In this paper, by using a new type of flame manikin which can rotate and make different postures, the dynamic scene that a firefighter wearing fire protective ensembles doing rescue job in the flash fire was simulated. According to the skin burn prediction result, the total burn percent suffered by the manikin was 7.76%, of which the 2nd degree burn and the 3rd degree burn account for 5.12% and 2.64% respectively. This indicates that the firefighter ensembles have relative good thermal protective property. It can provide enough protection for the firefighter in 8s dynamic exposure while more protection should be added to the head. | |||
TO cite this article:Li Jun,Li Xiaohui,Wang Min. Thermal Protection Evaluation of Fire Fighter Ensembles based on a Flame Test Manikin System[OL].[11 July 2013] http://en.paper.edu.cn/en_releasepaper/content/4551609 |
3. Analyzing the Combustion Characters of Fire Protective Clothing Exposed to Flash Fire | |||
Li Jun,Huangfu Xiaodong,Wang Min | |||
Textile Science and Technology 11 July 2013 | |||
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Abstract:Combustion characters such as afterflame, color fading, thermal shrinkage, carbonization, smoke production provide a comprehensive reflection of the garment performance as a whole. Based on the flame manikin testing system, six kinds of garments which can be divided into two groups (PSA clothing and aramid clothing) were used for combustion experiments, and the combustion characters were analyzed under the same exposure conditions. Results show that the after flame time of PSA clothing was longer than that of aramid clothing, showing poorer flame resistant performance. Large areas of color fading happened to most of the test samples. The average thermal shrinkage of the PSA clothing is greater than the aramid clothing with similar weight and weaving structure. Clothing with larger fabric gram weight and thickness tends to have smaller shrinkage degree. The carbonization degree of PSA clothing was more serious than that of aramid clothing. Smoke amount may relate to the dying and finfish of fabric. | |||
TO cite this article:Li Jun,Huangfu Xiaodong,Wang Min. Analyzing the Combustion Characters of Fire Protective Clothing Exposed to Flash Fire[OL].[11 July 2013] http://en.paper.edu.cn/en_releasepaper/content/4551606 |
4. Heat transfer properties of the numerical human body simulated from the thermal manikin | |||
Li Jun,Wang Yunyi,Huang Ziwei,Lu Yehu,Zhao Mengmeng | |||
Textile Science and Technology 05 July 2013 | |||
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Abstract:This paper seeks to predict the heat transfer properties of the numerical manikin. It also aims to establish a simplified clothing model based on computational fluid dynamics (CFD) to predict the temperature in air layers between thermal manikin and clothing under different environments. The field experiments of nude or clothed thermal manikin were conducted in a climatic chamber. The CFD method was employed to build a nude or clothed numerical manikin to simulate the field experiment. The distribution of temperature and the velocity field around the nude human body and heat transfer coefficients were simulated in the optimized numerical climate chamber with a temperature of 20oC and velocity of 0.05m/s. The temperature in air layers entrapped in clothing dressed on the torso of manikin was also predicted under the same environmental condition. The CFD results showed good agreement with that of the nude or the dressed thermal manikin experiment. It demonstrated that CFD could properly predict the heat transfer properties of indoor human and temperature distribution in the air layer between human body and clothing. | |||
TO cite this article:Li Jun,Wang Yunyi,Huang Ziwei, et al. Heat transfer properties of the numerical human body simulated from the thermal manikin[OL].[ 5 July 2013] http://en.paper.edu.cn/en_releasepaper/content/4550805 |
5. Effects of Air Gap Entrapped in Multilayer Fabrics and Moisture on Thermal Protective Performance | |||
Li Jun,Wang Yunyi,Lu Yehu,Pan Jinhua | |||
Textile Science and Technology 05 July 2013 | |||
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Abstract:Thermal protection of firefighter protective clothing is greatly influenced by the air gap entrapped and moisture in clothing. In this paper, the effects of air gap size and position on thermal protective performance exposed to 84kW/m2 heat source were investigated. Water was also added to thermal liner to understand the effect of air gap coupled with moisture on thermal protection. It was indicated that the TPP of fabrics system increased with the air gap size. The air gap position also greatly influenced the heat transfer during exposure to flash fire. Moisture added weakened the positive effect of air gap size when the air gap exists far from heat source, and almost eliminated the favorable effect of air gap position. However, when there is no air gap or small air gap between outer shell fabric and moisture barrier, moisture increased the thermal protection performance of multilayer fabrics system. The results obtained suggested that certain air gap entrapped in fabrics system and clothing microclimate could improve thermal protection, and the complicated effect of moisture should also be considered. | |||
TO cite this article:Li Jun,Wang Yunyi,Lu Yehu, et al. Effects of Air Gap Entrapped in Multilayer Fabrics and Moisture on Thermal Protective Performance[OL].[ 5 July 2013] http://en.paper.edu.cn/en_releasepaper/content/4550802 |
6. Effect of relative humidity coupled with air gap on heat transfer of flame-resistant fabrics exposed to flash fire | |||
Li Jun,Lu Yehu,Li Xiaohui | |||
Textile Science and Technology 05 July 2013 | |||
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Abstract:Relative humidity (RH) and air gap size are two characteristic indices of clothing microclimate. The current thermal protective performance (TPP) tests can't evaluate protective performance of fabrics under microclimate with high temperature and humidity. In this study, a newly modified TPP test apparatus was applied to investigate the effect of RH in microclimate on heat transfer of fabrics exposed to flash fire. Air gap heights from 0 to 24mm with increment of 3mm were employed. Three microclimates with different RH were preconditioned respectively. The results indicate that the RH in microclimate significantly improves thermal protection of fabric with various air gaps. Under 35% RH, the TPP obviously increases with the air gap up to 15mm and then the increment becomes a little lower; under humidified condition (65% or 95% RH), it becomes higher substantially with air gap height increasing until 12mm, subsequently it decreases or increases alternatively if the size kept increasing. The positive effect of air gap with small size on thermal protective performance of fabrics is enhanced due to the increasing of vapor in the air; however, the positive effect of air gap with large size is interfered by the RH. It is indicated that around 12-15mm was a critical air gap size under 35% RH, while about 12mm was a key air gap size for damp microclimate with 65% or 95% RH. | |||
TO cite this article:Li Jun,Lu Yehu,Li Xiaohui. Effect of relative humidity coupled with air gap on heat transfer of flame-resistant fabrics exposed to flash fire[OL].[ 5 July 2013] http://en.paper.edu.cn/en_releasepaper/content/4550799 |
7. A New Approach to Characterize the Effect of Fabric Deformation on Thermal Protective Performance | |||
Li Jun,Li Xiaohui,Lu Yehu,Wang Yunyi | |||
Textile Science and Technology 05 July 2013 | |||
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Abstract:It is very important to evaluate thermal protective performance in laboratory simulated fire scenes as accurately as possible. For this paper, to thoroughly understand the effect of fabric deformation on basic physical properties and thermal protective performance (TPP) of flame-retardant fabrics exposed to flash fire, a new modified TPP testing apparatus was developed. Different extensions were employed to simulate the various extensions displayed during different body motions. The tests were also carried out with different air gaps. The results showed a significant decrease in air permeability after deformation. However, the change of thickness was slight. The fabric deformation had a complicated effect on thermal protection with different air gaps. The change of TPP depended on the balance between the surface contact area and thermal insulation. The newly developed testing apparatus could be well employed to evaluate the effect of deformation on TPP of flame-resistant fabrics. | |||
TO cite this article:Li Jun,Li Xiaohui,Lu Yehu, et al. A New Approach to Characterize the Effect of Fabric Deformation on Thermal Protective Performance[OL].[ 5 July 2013] http://en.paper.edu.cn/en_releasepaper/content/4550796 |
8. Investigation of Garment Apparent Temperature under Different Air Gaps by Simulated and Experimental Methods | |||
ZHANG Zhaohua,WANG Yunyi,LI Jun | |||
Textile Science and Technology 30 March 2011 | |||
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Abstract:The influence of air gap thickness on clothing surface temperature is analyzed by means of experimental and simulated methods. A three-dimensional body scanner is used to determine the air gap distribution between different-sized garments. The clothing surface temperature is measured by an infrared thermal camera to evaluate the heat transfer through air gap layer. The combination of two non-contact measuring techniques is a novel way to investigate the relationship between air gap thickness and clothing surface temperature. A mathematical model is set up to simulate the heat and moisture transfer from skin to environment by including the sensible and latent heat transfer through air gap layer under clothing, fabric layer and boundary air layer adjacent to the fabric. The established mathematical model is used to forecast the surface temperature and evaluate the heat transfer capacity of different sized garments. | |||
TO cite this article:ZHANG Zhaohua,WANG Yunyi,LI Jun. Investigation of Garment Apparent Temperature under Different Air Gaps by Simulated and Experimental Methods[OL].[30 March 2011] http://en.paper.edu.cn/en_releasepaper/content/4418385 |
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