14382

13000

كارشناسي ارشد

تكنولوژي نساجي

اصفهان : دانشگاه صنعتي اصفهان

1397

[نه]، ۶۰ص.: مصور، جدول، نمودار

پرهام سلطاني، محمد ذره‌بيني

محمدقانع، صديقه برهاني

1397/12/05

كتابنامه

نساجي

مهندسي نساجي

1397/12/06

ID13000

59AbstractGlobal scarcity of energy sources the ever increasing use of energy and the excessive consumption ofenergy by various communities in addition to environmental pollution and wasting of national funds has endangered the future of human life Although Iran gracefully has one of the richest sources ofenergy on global scale however misuse of the God given gift can lead to irreparable and fundamentaldamages to national interests Therefore the rational use of energy resources and constant endeavorin optimization of efficient energy use must be a national priority The use of thermal insulators is oneof the most important means of energy consumption management Nonwoven fabrics due to theirunique properties including short production process low weight to volume ratio high flexibility highporosity low heat transfer fairly low cost ease of installation and the suitability of use in widespectrum of applications have been considered as the most desirable thermal insulators In this research the effect of the factors affecting the heat transfer properties of nonwoven fabrics isstudied Experimental needled specimens of different mass per unit area and thickness were producedon a laboratory needling production line equipped with carding machine and horizontal cross lapper Effect of factors such as in and through plane fiber orientation on thermal conductivity and resistancecoefficient was investigated In the absence of the much needed measuring apparatus a togometer wasdesigned and fabricated to conduct the heat transfer experiments Realistic 3D images of specimenswere obtained using X ray Micro computed tomography and spacial fiber orientation was calculatedusing image processing method Results showed that increase in needle density leads to increase inthrough plane fiber orientation and decrease in in plane fiber orientation of the specimens It wasfound that increase in through plane fiber orientation leads to increase in thermal conductivitycoefficient of the specimens Change in in plane fiber orientation was found to have no effect on thethermal conductivity of the specimens Results showed that thermal conductivity coefficient ofspecimens increases with increase in mass per unit area of specimens Finally it was concluded thatvolume fraction of the fibers is the most effective factor that determines thermal conductivitycoefficient of needled nonwoven fabrics Key words Needled nonwoven fabric thermal conductivity coefficient fabric thicknes in plane fiberorientation through plane fiber orientation X ray Micro computed Tomography

پرهام سلطاني، محمد ذره‌بيني

محمدقانع، صديقه برهاني