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新型织物微气候测试圆筒仪的研制 总被引:1,自引:1,他引:0
针对现有微气候热湿传递测试装置主要集中于出汗热平板仪,只能进行织物的一维传热传湿测试情况,通过自行设计改造了一种出汗圆筒仪来测试织物微气候的动态热湿传递性能,该微气候测试圆筒仪能模拟人体的躯干形态,进行二维传热传湿的测试,更符合人体的实际穿着情况。文章对该微气候测试系统的工作原理进行了详细阐述,同时对实验测得的温、湿度连续变化曲线进行了分析,指出能比较全面反映织物动态热湿舒适性能的5个特征指标是KTs、Tequ、△T、KTe、RHequ。 相似文献
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对服装织物层基本几何单元内空气层与纱线热湿传递机理模型进行了数值模拟分析 ,建立了空气层与纱线交界处的热湿传递动态过程 ,通过计算机仿真分析了织物内纱线、空气层的温度场和湿度场 ,并探讨了纱线材料特性、织物的组织结构对织物层热湿传递过程的影响规律 相似文献
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通过建立平纹机织物单元结构3D热湿传递的数值模型来研究在热湿从人体皮肤通过织物传递的情况下,任意时刻的热流量和湿流量在织物内部的传递规律,并采用MATLAB语言编程对模型数值求解。模拟结果表明:织物内部温度场、湿分浓度场具有明显的时间效应,任一时刻网格单元节点处的温度、相对湿度随时间的变化而变化并逐渐达到平衡状态。这对于深入研究服装动态热湿舒适性具有重要的指导意义。 相似文献
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对服装织物层基本几何单元内空气层与纱线热湿传递机理模型进行了数值模拟分析,建立了空气层与纱线交界处的热湿传递动态过程,通过计算机仿真分析了织物内纱线、空气层的温度场和湿度场,并探讨了纱线材料特性、织物的组织结构对织物层热湿传递过程的影响规律。 相似文献
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织物热湿传递性能是影响着装舒适性的重要因素。为指导舒适性面料的开发,需准确测试织物热湿传递性能,明确织物热湿传递机制。因此,文中介绍了稳态条件下织物热传递和湿传递的测试装置及方法,动态条件下常温环境、冷环境及两种环境交换的织物热湿传递测试装置及方法,综述了织物热湿传递的稳态模型和动态模型的发展历程及现有不足。基于目前的研究现状,从测评方法及数学模型两方面对未来研究方向提出展望,即搭建多种环境及运动状态下的织物微气候测评系统,基于微观尺度建立三维织物热湿传递动态模型。 相似文献
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为全面准确地评价低辐射热暴露下消防服的热防护性能,分析了现阶段的实验室测评方法和数值模拟方法。基于消防服内传热机制的研究,阐述了消防服内干态传热模型和热湿耦合传递模型的研究现状,总结了热防护性能的影响因素;分析了现阶段低辐射热暴露下织物和服装热防护性能测评方法,分别从测试方法的差异因素和局限2个角度阐述不同实验方法及实验装置对热防护性能预测的影响;总结了目前数值模拟在消防服热湿传递机理研究方面的应用;最后指出在未来的研究中,应全面准确模拟真实的低辐射热暴露环境,提高消防服热防护性能测评的准确性。 相似文献
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考虑内部辐射下织物热湿传递现象的数值研究 总被引:2,自引:0,他引:2
人体在着装情况下的热湿传递现象对人体的热舒适性的研究有着很重要的地位。考虑了由于温度差而引起的织物内部的辐射热传递,对织物中的热湿传递现象进行了数值研究,建立了考虑辐射现象下织物内部热湿传递的简单模型,并讨论了计算结果。 相似文献
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基于COMSOL的平房仓冷却通风过程中粮堆热湿耦合传递研究 总被引:2,自引:0,他引:2
粮仓冷却干燥通风是确保储粮安全的重要技术措施,在此过程中粮堆内部的热湿耦合迁移过程非常复杂。在COMSOL软件中,建立了冷却干燥通风过程中高大平房仓的三维物理模型,通过修改COMSOL内置材料方程、耦合渗流、能量守恒、动量守恒和水分迁移控制方程,以实测的送风空气温度和湿度为入口边界条件,数值模拟了湍流、湿空气传热、湿空气传质、多孔介质传热、多孔介质传质等多个物理场,并考虑了热湿耦合、温度耦合和流动耦合,对高大平房仓粮堆内冷却干燥通风过程中的热湿迁移规律进行了研究。基于实际高大平房仓的验证结果表明,通过修改COMSOL内置方程可以准确模拟预测冷却干燥通风过程中粮堆内热湿耦合传递过程,数值模拟结果可用于指导粮仓冷却干燥通风过程和粮仓通风系统优化。 相似文献
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Éliton Fontana Rafael Donca Antônio Augusto Ulson de Souza Selene M.A. Guelli Ulson de Souza 《纺织学会志》2013,104(5):672-682
The moisture accumulation within clothing is a serious problem for sportswear and clothing in cold climate. There are several experimental methods available to measure moisture build up in insulate materials. However, information on parameters such as temperature, relative humidity and vapor pressure can be obtained through simulation using a predictive mathematical model. The focus of this study is the development of a mathematical model to simulate heat and moisture transfer in a sample of fabric, coated to provide insulation, which is in contact with human skin on one side and with the external environment on the other. To numerically simulate the mathematical model, the finite volume method is used and a computational procedure for the solution of the model is designed. The simulation results are analyzed to verify whether they are consistent with the physical reality. 相似文献
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Sedigheh Borhani Seyed Abdolkarim Hosseini Ravandi Seyed Gholamreza Etemad 《纺织学会志》2013,104(8):860-866
In this study, the coupled heat and moisture transfer of polyacrylonitril nanofiber mats were investigated by theoretical and experimental methods. A mathematical model was used to describe and predict the coupled heat and moisture transfer of nanofiber mats. Based on the results obtained by scale analysis method, order of magnitude of heat transfer by radiation is negligible for nanofiber mats but heat transfer by convection is important. In this investigation, the coupled heat and moisture transfer including convection heat transfer was solved numerically by finite difference method. Comparison between numerical results and experimental data shows good agreement, which indicates the high accuracy of the numerical results. 相似文献
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A mathematical model was developed to describe the processes of coupled heat and mass and momentum transfer occurring in convective drying of 100% porous cotton fabric. In this model, the variation in both air and fabric properties were expressed as a function of temperature and moisture content. The resulting systems of transient non-linear partial differential equations in the space-time domain together with the set of initial values and boundary conditions were numerically solved by utilizing the finite difference method. A series of laboratory drying experiments were performed using a computer-controlled dehydration system, which was developed to obtain data of drying kinetics under varying operating conditions for the validation of the predicted results from the proposed model. The experimental results has shown a very good agreement with the predictions of the model, which indicates that the proposed numerical model can be used with confidence as a tool in optimizing the design and operation of the fabric drying system. A parametric study was performed using the modeling tool has demonstrated the impact of key operational parameters on the drying kinetics, which has significant meaning on improving fabric’s appearance smoothness and decreasing the damage. It is expected that the model can be applied for other fiber products and processes involving similar phenomena. 相似文献
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为拓展机织物热舒适性设计、评估和优化的思路,提供一种有效预测织物热阻的方法,基于织物的三维模型及传热学理论,对织物系统进行一维热传递的数值模拟,得到织物传热过程中的温度分布特征。利用显微图像及切片技术获取织物几何结构参数,建立平纹织物的几何模型,并与纱线周围静止空气装配,构成织物系统的三维模型,借助有限元分析软件ABAQUS,根据模拟环境设置边界条件与相互作用,计算模型的数值解。最后通过模拟皮肤散热的恒温平板实验,对数值模拟结果进行验证,结果显示:织物外表面温度的模拟值与实验值随时间变化的一致性较好,理论热阻值与实验热阻值相对误差为3.9%,二者吻合度较高。 相似文献
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