Study of the relationships between materials and their radiative properties: Application to natural fibers for the spectral wavelengths range 0.25–2.5 μm

Papini, Marie

doi:10.1016/0020-0891(89)90014-6

Cited by 7 publications

(4 citation statements)

References 6 publications

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“…The spectral data showed that fabrics seem to be spectrally selective: spectral reflectivity and transmissivity are low in the UV range and increase with the wavelength until & 1.9 mm and then decrease. These variations are similar to those observed by Papini [29,30]. For all fabrics, integrated hemispherical reflectivity and transmissivity are similar in the visible range and the energetical range, whereas they are slightly higher in the NIR range and lower in the UV range.…”

Section: Radiative Propertiessupporting

confidence: 88%

“…Finally, the radiative properties measured in this work are the same as those found in the literature for natural fiber fabrics [29,30]. The materials studied here offer good UV protection level and it is confirmed that thickness is the most useful variable to understand differences in UV protection between fabrics [31].…”

Section: Radiative Propertiessupporting

confidence: 76%

“…Experiments were first performed to measure reflected or transmitted direct radiations, but no signal was measured. As fabrics reflect and transmit radiations in many directions [29,30], the scattered radiations were consequently measured with an integrating sphere in order to measure hemispherical properties. Table 2 gathers all the total hemispherical radiative properties over the energy range, the UV range, the visible range and the Near Infrared (NIR) range for the five fabrics conditioned, in dry and wet state.…”

Section: Radiative Propertiesmentioning

confidence: 99%

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Radiative and hygrothermal properties of flax/viscose spunlaced nonwovens

Colinart

Pierre

2016

Journal of Industrial Textiles

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Biobased fabrics are now getting widely used as solar shading for managing solar gain and daylight management and reducing building peak load and annual energy consumption of existing buildings. This work proposes to characterize five spunlaced nonwovens made of 65% of flax and 35% of viscose with different grammage. Radiative properties (transmissivity, reflectivity and absorptivity) are evaluated not only over the sun's spectrum, but also over UV, visible and IR spectra. In addition, hygrothermal properties, such as thermal resistance, specific heat capacity or water vapor resistance, are also evaluated. Results indicate that these nonwovens present low transmittivity, which is interesting in the view of managing solar gain. Furthermore, it was found that radiative properties are mainly influenced by nonwoven's thickness and porosity, as well the relative humidity. Lastly, hygrothermal properties (thermal resistance, thermal conductivity and water vapor resistance) are impacted mainly by porosity.

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Section: Radiative Propertiessupporting

confidence: 88%

Section: Radiative Propertiessupporting

confidence: 76%

Section: Radiative Propertiesmentioning

confidence: 99%

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Radiative and hygrothermal properties of flax/viscose spunlaced nonwovens

Colinart

Pierre

2016

Journal of Industrial Textiles

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“…Experimental results of Papini (1989) show a strong wavelengthdependenee of the directional-hemispherical spectral reflectance for natural fibers (cotton and wool). For ).. 2: 0.6 J-lm, this reflectance increases substantia11y over that for ).. :::; 0.6 J-lm.…”

Section: Measurementsmentioning

confidence: 96%

Principles of Heat Transfer in Porous Media

Kaviany

1991

Mechanical Engineering Series

824

752

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except for brief excerpts in connection with reviews or scholarly analysis. Use in connection with any form of information storage and retrieval, electronic adaptation, computer software, or by similar or dissimilar methodology now known or hereafter developed is forbidden. The use of general descriptive names, trade names, trademarks, etc., in this publication, even if the former are not especially identified, is not to be taken as a sign that such names, as understood by the Trade Marks and Merchandise Marks Act, may accordingly be used freely by anyone.Camera-ready copy prepared from the author's LaTeX file. 987654321 To my parents Farideh and Morad Series PrefaceMechanical engineering, an engineering discipline born of the needs of the industrial revolution, is once again asked to do its substantial share in the call for in dust rial renewal. The general call is urgent as we face profound issues of productivity and competitiveness that require engineering solutions, among others. The Mechanical Engineering Series is a new series, featuring graduate texts and research monographs, intended to address the need for information in contemporary areas of mechanical engineering.The series is conceived as a comprehensive one that will cover a broad range of concentrations important to mechanical engineering graduate education and research. We are fortunate to have a distinguished roster of consulting editors, each an expert in one of the areas of concentration. The names of the consulting editors are listed on the first page of the volume. PrefaceThis monograph aims at providing, through integration of available theoretical and empirical treatments, the differential conservation equations and the associated constitutive equations required for the analysis of transport in porous media. Although the empirical treatment of fluid flow and heat transfer in porous media is over a century old, only in the last three decades has the transport in these heterogeneous systems been addressed in sufficient detail. So far, single-phase flow and heat transfer in porous media have been treated or at least formulated satisfactorily. But the subject of two-phase flow and the related he at transfer in porous media is still in its infancy. This monograph identifies the pr in ci pIes of transport in porous media, reviews the available rigorous treatments, and whenever possible compares the available predictions, based on these theoretical treatments of various transport mechanisms, with the existing experimental results. The theoretical treatment is based on the local volume-averaging of the momentum and energy equations with the closure conditions necessary for obtaining solutions. While emphasizing abasie understanding of heat transfer in porous media, the monograph does not ignore the need for the predictive tools. Therefore, whenever a rigorous theoretical treatment of a phenomenon is not available, semiempirical and empirical treatments are given.The monograph is divided into two parts: part 1 deals with single-phase flows and part 2...

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Radiation Heat Transfer

Kaviany

1995

Mechanical Engineering Series

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Study of the relationships between materials and their radiative properties: Application to natural fibers for the spectral wavelengths range 0.25–2.5 μm

Cited by 7 publications

References 6 publications

Radiative and hygrothermal properties of flax/viscose spunlaced nonwovens

Radiative and hygrothermal properties of flax/viscose spunlaced nonwovens

Principles of Heat Transfer in Porous Media

Radiation Heat Transfer

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