Thermal Properties of UPE-PMMA Blend Reinforced by ZnO Nanoparticles

In this study, thermal analysis properties (Heat Transfer) have been studied for UPE-PMMA polymer blend reinforced with x-ZnO where x is (0wt%, 1wt%, 2wt%, 3wt%, 4wt% and 5wt %). Ultrasonic dispersion technique used to prepare the nanocomposites specimens follow with cold casting technique using Teflon molds at standard conditions. C - Thermosensor (TC i) technique was used to measure the heat transfer properties such as; (thermal conductivity, thermal effusivity, thermal diffusivity, heat capacity and thermal resistance). Results show that the values of conductivity, effusivity and diffusivity are increased by succession of weight percentage of fillers. While a heat capacity and thermal resistance results show that the values are decreased progressively by succession of weight percentage of fillers. Scanning electron microscopy was employed to aid interpretation results of thermal analyzer and to show the distribution of nanoparticles in polymer matrix.

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Wear and Friction Characteristics of TiO2 – ZnO / PMMA Nanocomposites

European Journal of Engineering Research and Science ◽

10.24018/ejers.2017.2.4.287 ◽

2017 ◽

Vol 2 (4) ◽

pp. 6 ◽

Cited By ~ 2

Author(s):

Fadhil K. Farhan ◽

Bahjat Bahlol Kadhim ◽

Batool D. Ablawa ◽

Warqaa A. Shakir

Keyword(s):

Sliding Wear ◽

Ultrasonic Dispersion ◽

Nano Tio2 ◽

Casting Technique ◽

Volume Fractions ◽

Microscopy Technique ◽

Wear And Friction ◽

Base Matrix ◽

Pin On Disc ◽

Dispersion Technique

Tribological characteristics (Wear and Friction) have been studied for (PMMA) polymer, reinforced by nano [TiO2 - ZnO] with volume fractions (0, 2, 3, 4 and 5) vol. %. Ultrasonic dispersion technique was used to prepare the nanocomposites specimens followed by cold – casting technique using flash Teflon molds according to standard conditions. [Pin-on-disc] technique is used to measure wear rate and coefficient of friction. Tribological results show that the values are decreased progressively by succession of load increasing as well as volume fractions of fillers. Scanning electron microscopy technique were employed to aid interpretation results of sliding wear and distribution nanoparticles in base – matrix.

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Sand Distribution In Central Fergana

The American Journal of Interdisciplinary Innovations and Research ◽

10.37547/tajiir/volume03issue01-18 ◽

2021 ◽

Vol 03 (01) ◽

pp. 113-117

Author(s):

Sanoat Xomdamovna Zokirova ◽

◽

Rakhmatillo Fayzullaevich Akbarov ◽

Sadafxon Mukhammadaminovna Isagaliyeva ◽

Komila Ravshanovna Xonkeldiyeva ◽

...

Keyword(s):

Heat Transfer ◽

Heat Capacity ◽

High Heat ◽

Climatic Conditions ◽

High Heat Capacity ◽

Transfer Properties

Sands have a high heat capacity and rapid heat transfer - properties that sharply distinguish them from all other soils and determine the characteristic climatic conditions of sand massifs.

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Heat transfer properties of bifacial fabrics

Textile Research Journal ◽

10.1177/0040517516669077 ◽

2016 ◽

Vol 87 (19) ◽

pp. 2307-2313 ◽

Cited By ~ 3

Author(s):

Licheng Zhu ◽

Maryam Naebe ◽

Ian Blanchonette ◽

Xungai Wang

Keyword(s):

Heat Transfer ◽

Thermal Resistance ◽

Air Permeability ◽

Woven Fabrics ◽

Knitted Fabrics ◽

Plain Weave ◽

Knitted Structure ◽

Woven Structure ◽

Transfer Properties ◽

Single Jersey

Bifacial fabrics were produced on a purpose-built machine, using wool, acrylic and polyester yarns, with the woven structure being plain weave, and the knitted structure being single jersey. In this study, the heat transfer properties of these fabrics were compared with conventional woven and knitted fabrics. The bifacial fabrics had lower air permeability than knitted and woven fabrics, and they were warmer to touch. The thermal resistance of the bifacial fabrics was higher than the knitted and woven fabrics, and the thermal resistance of the two faces of the bifacial fabrics was statistically different.

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THE MECHANISM OF RAISING AND QUANTIFICATION OF SPECIFIC HEAT FLUX AT BOILING OF NANOFLUIDS IN FREE CONVECTION CONDITIONS

Energy Technologies & Resource Saving ◽

10.33070/etars.3.2017.03 ◽

2017 ◽

pp. 25-34

Author(s):

V.N. Moraru

Keyword(s):

Heat Transfer ◽

Heat Flux ◽

Heat Capacity ◽

Specific Heat ◽

Chemical Properties ◽

Heating Surface ◽

Physical Models ◽

Superheated Liquid ◽

Two Phase ◽

Boiling Process

The results of our work and a number of foreign studies indicate that the sharp increase in the heat transfer parameters (specific heat flux q and heat transfer coefficient _) at the boiling of nanofluids as compared to the base liquid (water) is due not only and not so much to the increase of the thermal conductivity of the nanofluids, but an intensification of the boiling process caused by a change in the state of the heating surface, its topological and chemical properties (porosity, roughness, wettability). The latter leads to a change in the internal characteristics of the boiling process and the average temperature of the superheated liquid layer. This circumstance makes it possible, on the basis of physical models of the liquids boiling and taking into account the parameters of the surface state (temperature, pressure) and properties of the coolant (the density and heat capacity of the liquid, the specific heat of vaporization and the heat capacity of the vapor), and also the internal characteristics of the boiling of liquids, to calculate the value of specific heat flux q. In this paper, the difference in the mechanisms of heat transfer during the boiling of single-phase (water) and two-phase nanofluids has been studied and a quantitative estimate of the q values for the boiling of the nanofluid is carried out based on the internal characteristics of the boiling process. The satisfactory agreement of the calculated values with the experimental data is a confirmation that the key factor in the growth of the heat transfer intensity at the boiling of nanofluids is indeed a change in the nature and microrelief of the heating surface. Bibl. 20, Fig. 9, Tab. 2.

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