The behavior of the thermal conductivity near the melting temperature of copper nanoparticle

Loulijat, Hamid; Zerradi, Hicham; Mizani, Soufiya; Achhal, El Mehdi; Dezairi, A.; Ouaskit, S.

doi:10.1016/j.molliq.2015.07.074

Cited by 41 publications

(24 citation statements)

References 53 publications

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“…Baralar, bakır, pirinç ve alüminyumdan olmak üzere değişik metallerden yapılır. Bakır için erime sıcaklığı 1380 ± 20 °K [8], Alüminyumun için erime sıcaklığı 643 ± 10 ° C [9], Pirinç (bakıra çinko karışımı) ergime sıcaklığı 950° C civarındadır [10]…”

Section: Elektri̇k Panosu Elemanlariunclassified

Pano Yangınları Önlenebilir mi? YaRDeS (Nesnelerin İnterneti ve Smart Uç Bazlı Sigorta Kaynaklı Yangın Risk Değerlendirme Sistemi)

Soyhan

Pekşen

Saylan³

et al. 2021

Uluslararası Yakıtlar Yanma Ve Yangın Dergisi

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YARDES, yangınların elektrik panosu kaynaklı çıkıp çıkmadığı konusunda veri elde edilmesi yanında, yangın riskinin anlık değerlendirilmesi sonucu ilgili birimlerin ve alarm sistemlerinin tetiklenmesini sağlayan bir yangın öncesi algılama sistemidir. Elektrik panolarına eklenecek cihaz ve toplanan verileri raporlayabilen merkezi bir sistemden oluşacak şekilde tasarlanmıştır. Sahada kullanılacak cihaz devreleri ile fazlardaki akım-gerilim-harmonik değerlerinin gerçek zamanlı ölçümleri gerçekleştirilerek; cihaza bağlı sensörler vasıtası ile sıcaklık ve pano içi sıcaklık-nem-toz, O2-CO-CO2 seviyeleri ve topraklama değerlerinin ölçümü yapılmaktadır. Bu şekilde yangın sonrası olay yeri inceleme faaliyetlerinde yangının elektrik kaynaklı olup olmadığına dair incelemelerde verilerin elde edilmesi sağlanmaktadır. Projenin ticarileşme aşamasında, yangın öncesi algılama ve yangına erken müdahale olanağı tanıyacak şekilde sistemin geliştirilmesi yapılmaktadır.

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Section: Elektri̇k Panosu Elemanlariunclassified

Pano Yangınları Önlenebilir mi? YaRDeS (Nesnelerin İnterneti ve Smart Uç Bazlı Sigorta Kaynaklı Yangın Risk Değerlendirme Sistemi)

Soyhan

Pekşen

Saylan³

et al. 2021

Uluslararası Yakıtlar Yanma Ve Yangın Dergisi

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“…Particles of metals such as metallic nanoparticles and metallic submicron-sized particles can contact other materials efficiently and effectively achieve metal-metal bonding, since they have a larger apparent surface area than that of their bulk. In particular, nanoparticles have melting points lower than those of their bulk of metals [18][19][20]. The lower melting points can be applied to metal-metal bonding at low temperatures.…”

Section: Introductionmentioning

confidence: 99%

Preparation of high-concentration colloid solutions of metallic copper particles and their use in metal–metal bonding processes

et al. 2019

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A high-concentration colloid solution of metallic copper nanoparticles was prepared by the reduction of copper ions in aqueous solutions, and the nanoparticles were used to study metal-metal bonding. The colloid solution of metallic copper nanoparticles was prepared by mixing an aqueous solution of CuCl 2 and an aqueous solution of hydrazine (reductant) in the presence of citric acid and n-hexadecyltrimethylammonium bromide (stabilizers) at a final copper concentration as high as 0.1 M. The copper-particle size was ca. submicrometer. Many tiny particles with sizes of ca. 10-20 nm were deposited on the submicron-sized particles at high hydrazine concentrations. The tiny particles were considered to be produced through the growth of particle nuclei generated at the final reaction stage by residual hydrazine derived from the high hydrazine concentration. Metallic-copper discs were successfully bonded by annealing at 400 °C and a pressure of 1.2 MPa for 5 min in hydrogen gas with the help of the metallic-copper particles. The shear strength of the bonded copper discs was then measured. The highest shear strength of 41.7 MPa was recorded for the tiny particles/ immobilized particles, which could be explained by the low melting points of the tiny particles and the increase in bulk density provided by the dominant incorporation of the tiny particles into voids between the submicron-sized particles.

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“…In addition, it was shown that for any given particle diameter there is an optimum value of particle concentration that results in the highest heat transfer coefficient. Now a voluminous body of knowledge is available on the literature using nanofluids correlations, many models are presented to consider these different effective parameters on the conductive heat transfer of nanofluids and other thermo physical properties such as viscosity [20] thermal conductivity [21,22]. To the best of the authors' knowledge, no research on nanofluids flow and heat transfer over elliptical cylinder has been documented.…”

Section: Introductionmentioning

confidence: 99%

Heat Transfer Characteristics of Nanofuid Flow around an Elliptical Cylinder

Zerradi¹,

Mizani²,

Dezairi³

et al. 2016

Int J Adv Tech

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This paper presents the results of extensive numerical simulations, based on the control volume method, of 2D nanofluid fluid flow around a heated elliptical cylinder with different incidence angle and aspect ratio. The continuity and momentum equations have been numerically solved using a SIMPLE algorithm. Two types of nanofluids consisting of Al 2 O 3 and CuO nanoparticles dispersed separately in base fluids of water and ethylene glycol mixture 60:40 (by mass), were selected to evaluate their effect on the flow over elliptical cylinder, also their superiority over conventional fluids. The thermo-physical parameters of nanofluid have been estimated using the theory of one fluid phase, a contemporary correlations of thermal conductivity and viscosity of nanofluids have been used in this paper, which are functions of particle volumetric concentration as well as temperature. The results of heat transfer characteristics of nanofluid flow over elliptical cylinder reveled clear improvement comparing with the base fluids. This enhancement is more important in flows with different geometry characteristics of the elliptical cylinder. While the aspect ratio and the incidence angle, exert significant influence on the heat transfer characteristics. The obtained results indicate that the use of aspect ratio 0.83 and incidence angle 79.2° lead to the highest amounts of heat transfer inside the tube.

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The behavior of the thermal conductivity near the melting temperature of copper nanoparticle

Cited by 41 publications

References 53 publications

Pano Yangınları Önlenebilir mi? YaRDeS (Nesnelerin İnterneti ve Smart Uç Bazlı Sigorta Kaynaklı Yangın Risk Değerlendirme Sistemi)

Pano Yangınları Önlenebilir mi? YaRDeS (Nesnelerin İnterneti ve Smart Uç Bazlı Sigorta Kaynaklı Yangın Risk Değerlendirme Sistemi)

Preparation of high-concentration colloid solutions of metallic copper particles and their use in metal–metal bonding processes

Heat Transfer Characteristics of Nanofuid Flow around an Elliptical Cylinder

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