scholarly journals Influence of Screen Printed Layers on the Thermal Conductivity of Textile Fabrics

2018 ◽  
Vol 26 (5(131)) ◽  
pp. 70-74
Author(s):  
Ilda Kazani ◽  
Ilda Kazani ◽  
Gilbert De Mey ◽  
Carla Hertleer ◽  
Lieva Van Langenhove ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Measuring Method ◽  
Conducting Layer ◽  
Metallic Materials ◽  
Textile Fabrics ◽  
Electric Conducting ◽  
Smart Textile ◽  
Thermographic Camera ◽  
Textile Fabric ◽  
Screen Printed

In the smart textile field the combination of textile and metallic materials is rising. In order to conduct electricity in textile, different methods are used. This paper deals with a new measuring method to determine the lateral thermal conductivity of a textile fabric. The technique starts by measuring the temperature distribution on the fabric using a thermographic camera. In addition to that, the method outlined in this paper will also allow to determine the change in thermal conductivity when an electric conducting layer has been screen printed on a textile fabric

Electrical Simulation Experiment and the Analysis of Thermal Conductivity of Materials

2014 ◽  
Vol 989-994 ◽  
pp. 599-602
Author(s):  
Wen Bo Li ◽  
Yin Gai Jin ◽  
Shuang Yin ◽  
Pei Yan Chen
Keyword(s):  
Thermal Conductivity ◽  
Heat Conduction ◽  
Simulation Experiment ◽  
Simulation Method ◽  
Measuring Method ◽  
Electrical Simulation ◽  
Conductive Plate ◽  
Electric Simulation ◽  
Unsteady Heat Conduction ◽  
Different Shapes

s: Jilin university innovation experiment Electrical Simulation Experiment and the Analysis of Thermal Conductivity of Materials aims to solve the problem of thermocouple measuring tenderness in error. Thermocouple is used to measure temperature when measuring unsteady heat conduction in laboratory. The improved measuring method of unsteady heat conduction puts the breakthrough on the electric simulation method. The text bench is constructed by different shapes of conductive plate which is made of the graphite conductive paint, and voltmeter is refitted by diodes and controlled transformer. Through the test bench, we finished the simulation of unsteady heat conduction under the similar thermal conductive boundary conditions. Finally, the error analysis of experiment and the advantages of electric simulation method are given in this paper.

scholarly journals Thermal Conductivity of High Performance Concrete in Wide Temperature and Moisture Ranges

10.14311/174 ◽  
2001 ◽  
Vol 41 (1) ◽  
Author(s):  
J. Toman ◽  
R. Černý
Keyword(s):  
Thermal Conductivity ◽  
High Performance ◽  
Room Temperature ◽  
High Performance Concrete ◽  
Measuring Method ◽  
Point Of View ◽  
Temperature Measurements ◽  
Temperature Fields ◽  
Measured Temperature ◽  
Hot Wire

The thermal conductivity of two types of high performance concrete was measured in the temperature range from 100 °C to 800 °C and in the moisture range from dry material to saturation water content. A transient measuring method based on analysis of the measured temperature fields was chosen for the high temperature measurements, and a commercial hot wire device was employed in room temperature measurements of the effect of moisture on thermal conductivity. The measured results reveal that both temperature and moisture exhibit significant effects on the values of thermal conductivity, and these effects are quite comparable from the point of view of the magnitude of the observed variations.

A New Measuring and Calculating Method for Concrete Thermal Conductivity with Multipoint

2013 ◽  
Vol 671-674 ◽  
pp. 1657-1660
Author(s):  
Sheng Qiang ◽  
Chao Wu ◽  
Nan Nan Zhang ◽  
Zhi Qiang Xie
Keyword(s):  
Thermal Conductivity ◽  
Stress Field ◽  
Thermal Field ◽  
Measuring Method ◽  
New Method ◽  
Mass Concrete ◽  
Calculation Formula ◽  
The Real ◽  
Calculating Method ◽  
Simulation Results

The real thermal parameters always have inevitable influence on the simulation results of the structure thermal field and stress field in the construction of mass concrete. A new measuring and calculation method for concrete thermal conductivity was put forward. Eight or six sensor points measuring method and calculation formula are present, and the latter is the simplification of the former. Comparing the real thermal conductivity with the calculation result by the new method, it can be seen that the thermal conductivity can be obtained within about 6 day’s age at site and with the accurate degree of 98%. The new method will provide an efficient way for the concrete structure researcher and designer.

Influencing factors and measuring method of the heat conducting performance of UHMWPE single fiber

2017 ◽  
Vol 47 (8) ◽  
pp. 1908-1924 ◽  
Author(s):  
Dai Guoliang ◽  
Li Li ◽  
Xiao Hong ◽  
Zhai Maolin ◽  
Shi Meiwu
Keyword(s):  
Thermal Conductivity ◽  
Volume Fraction ◽  
Measuring Method ◽  
Theory Model ◽  
Single Fiber ◽  
Heat Conducting ◽  
Drawing Ratio ◽  
Equivalent Thermal Conductivity ◽  
Uhmwpe Fiber ◽  
The Difference

The fiber with higher thermal conductivity is rare and it is difficult to measure the thermal conductivity of a single fiber. In this paper, the composite samples of ultra-high molecular weight polyethylene (UHMWPE) fiber and epoxy resin were prepared in order to study the heat conducting properties of the UHMWPE fiber. The specific heat capacity and thermal conductivity of the samples were tested by the transient plane source method. Based on the serial–parallel equivalence theory model, the axial and radial thermal conductivities of the UHMWPE filament were calculated. Effects of the volume fraction of fiber, fineness and drawing ratio on thermal conductivity were explored. Also, the relationship between the structure and thermal conductive capacity was revealed. The results showed that the volume fraction of fibers should be large to obtain a relative accurate value. Moreover, the difference in fineness led to different thermal conductivity of the UHMWPE fiber, the cruder the fiber, the higher the thermal conductivity. Besides, as the drawing ratio increased, the crystallinity and orientation of the fibers also increased. Thus, the results were that the axial equivalent thermal conductivity of the filament was dramatically increased, while the radial equivalent thermal conductivity grew a little. The paper showed that UHMWPE fibers had much higher thermal conductivity than other fibers, and also provided a new method to get the thermal conductivity of UHMWPE single fiber.

An Analysis of the Mechanical Forces in Latch Needle Cam Systems

1992 ◽  
Vol 206 (2) ◽  
pp. 129-137 ◽  
Author(s):  
B L MacCarthy ◽  
J M Sharp ◽  
N D Burns
Keyword(s):  
General Model ◽  
Textile Yarn ◽  
Basic Mechanism ◽  
Normal Operation ◽  
Mechanical Forces ◽  
Knitted Fabrics ◽  
Textile Fabrics ◽  
Cam Profile ◽  
Textile Fabric ◽  
Cam Systems

The majority of textile fabrics are either woven or knitted. Knitted fabrics are most frequently produced on weft knitting machines. The range of machinery is very diverse but the same basic mechanism is employed to convert textile yarn into knitted textile fabric. The mechanism is a specialized needle and cam system known as a latch needle cam system. This paper develops a general model for the mechanical forces that arise in normal operation of a latch needle cam system. The limitations of previous models are noted. The model may be used to predict mechanical forces for any specified cam profile and for the most common needle and cam arrangements. The model will be used in a following paper on yarn forces in latch needle cam systems. The performance of the model will be reported in a following paper describing an experimental programme and experimental results

scholarly journals Unmasking the Mask: Investigating the Role of Physical Properties in the Efficacy of Fabric Masks to Prevent the Spread of the COVID-19 Virus

Materials ◽  
2021 ◽  
Vol 14 (24) ◽  
pp. 7756
Author(s):  
Adine Gericke ◽  
Mohanapriya Venkataraman ◽  
Jiri Militky ◽  
Hester Steyn ◽  
Jana Vermaas
Keyword(s):  
Structural Properties ◽  
Woven Fabrics ◽  
Source Control ◽  
Knitted Fabrics ◽  
Performance Properties ◽  
Nonwoven Fabrics ◽  
Textile Fabrics ◽  
Overall Performance ◽  
Textile Fabric

To function as source control, a fabric mask must be able to filter micro-droplets (≥5 µm) in expiratory secretions and still allow the wearer to breathe normally. This study investigated the effects of fabric structural properties on the filtration efficiency (FE) and air permeability (AP) of a range of textile fabrics, using a new method to measure the filtration of particles in the described conditions. The FE improved significantly when the number of layers increased. The FE of the woven fabrics was generally higher, but double-layer weft knitted fabrics, especially when combined with a third (filter) layer, provided a comparable FE without compromising on breathability. This also confirmed the potential of nonwoven fabrics as filter layers in masks. None of the physical fabric properties studied affected FE significantly more than the others. The variance in results achieved within the sample groups show that the overall performance properties of each textile fabric are a product of its combined physical or structural properties, and assumptions that fabrics which appear to be similar will exhibit the same performance properties cannot be made. The combination of layers of fabric in the design of a mask further contributes to the product performance.

Simple Measuring Method of Thermal Conductivity of Silicone Grease and Effect of Carbon Nanomaterials on Its Thermal Conductivity

2007 ◽  
Author(s):  
Toshio Tomimura ◽  
Seiji Nomura ◽  
Masaaki Okuyama
Keyword(s):  
Thermal Conductivity ◽  
Carbon Nanomaterials ◽  
Cooling System ◽  
Thermal Contact ◽  
Conductivity Measurement ◽  
Measuring Method ◽  
Heat Fluxes ◽  
Quantitative Relation ◽  
Silicone Grease ◽  
Simple Method

In the electronic equipment like personal computers with high heat fluxes for instance, the thermal contact resistance plays an important role in its cooling system. To attain high cooling performance, some kind of grease is often introduced between a heat source and a heat sink. In the present study, a simple method for thermal conductivity measurement of grease has been proposed and confirmed its validity by using greases with known thermal conductivity. From a series of measurements, the validity of the present measuring method has been confirmed. Further, the effect of the addition of carbon nanomaterials on the thermal conductivity of silicone grease has been investigated, and its quantitative relation has been clarified.

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