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Faris Mohammed Ali

Bio: Faris Mohammed Ali is an academic researcher from Universiti Putra Malaysia. The author has contributed to research in topics: Nanofluid & Thermal diffusivity. The author has an hindex of 4, co-authored 4 publications receiving 56 citations.

Papers
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Journal ArticleDOI
TL;DR: The thermal conductivity and thermal diffusivity of the nanofluids increase with an increase in the volume fraction concentration and are measured using the hot wire-laser beam displacement technique.
Abstract: This article reports on the effect of aluminum (Al) volume fraction concentration on the thermal conductivity and thermal diffusivity of Al nanoparticles suspended in water, ethylene glycol, and ethanol based fluids prepared by the one step method. The Al nanoparticles were independently produced and then mixed with a base fluid to produce the nanoparticles suspension. The thermal conductivity and thermal diffusivity of the nanofluids were measured using the hot wire-laser beam displacement technique. The thermal conductivity and thermal diffusivity were obtained by fitting the experimental data to the numerical data simulated for Al in distilled water, ethylene glycol, and ethanol. The thermal conductivity and thermal diffusivity of the nanofluids increase with an increase in the volume fraction concentration.

27 citations

Journal ArticleDOI
TL;DR: In this article, the thermal conductivity and thermal diffusivity of four nanofluids containing 11, 25, 50, and 63 nm diameter aluminum oxide (Al2O3) nanoparticles in distilled water were measured using transient hot-wire laser beam displacement technique.
Abstract: In this study we present new data for the thermal conductivity enhancement in four nanofluids containing 11, 25, 50, and 63 nm diameter Aluminum oxide (Al2O3) nanoparticles in distilled water. The nanofluids were prepared using single step method (that is, by dispersing nanoparticle directly in base fluid) which was gathered in ultrasonic device for approximately 7 h. The transient hot-wire laser beam displacement technique was used to measure the thermal conductivity and thermal diffusivity of the prepared nanofluids. The thermal conductivity and thermal diffusivity were obtained by fitting the experimental data to the numerical data simulated for Al2O3 in distilled water. The results show that, the thermal conductivity and thermal diffusivity enhancement of nanofluids increases as the particle size increases. Thermal conductivity and thermal diffusivity enhancement of Al2O3 nanofluids was increase as the volume fraction concentration increases. This enhancement attributed to the many factors such as, ballistic energy, nature of heat transport in nanoparticle, and interfacial layer between solid/fluids. Key words: Thermal conductivity, thermal diffusivity, effect of particle size, effect of volume fraction.

19 citations

Journal ArticleDOI
TL;DR: In this paper, the effects of volume fraction concentration and particle materials on the thermal conductivity and thermal diffusivity of nanofluids were determined, and the results showed that thermal conductivities and thermal diffusion increased linearly with increasing volume fraction of nanoparticles in the respective base fluids.
Abstract: Nanofluids, a mixture of nanoparticles and fluids, have exceptional potential to improve their effective thermal conductivity and thermal diffusivity, aluminum and aluminum oxide nanofluids with five different volume fractions of nanoparticle suspensions in different base fluids, i.e., distilled water, ethylene glycol (EG), and ethanol were prepared by mixing nanopowder and base fluids. Sonication with high-powered pulses was used to ensure the dispersion of nanoparticles in good uniformity in the base fluids. The hot wire-laser beam displacement technique was used to measure thermal conductivity and thermal diffusivity of the prepared nanofluids. The effects of the volume fraction concentration and particle materials on the thermal conductivity and thermal diffusivity of nanofluids were determined. The results showed that the thermal conductivity and thermal diffusivity increased linearly with increasing volume fraction concentration of nanoparticles in the respective base fluids. In addition, the thermal conductivity and thermal diffusivity increased faster in the Al2O3 nanofluids than in all the three base fluids.

15 citations

01 Jan 2010
TL;DR: In this article, the thermal conductivity and diffusivity of nanofluids of Chromium (Cr) in water, EG and Ethanol have been measured via hot wire-photothermal deflection technique.
Abstract: In this study, nanofluids of Chromium (Cr) in water, Ethylene Glycol and Ethanol have been prepared using single step method. The thermal conductivity and diffusivity of these nanofluids were measured via hot wire-photothermal deflection technique. Based on finite difference method (FDM) temperature distribution and photothermal deflection caused by the hot wire inside nanofluids was obtained. A numerical simulation of the heat conduction equation and probe beam deflection has been performed to determine the thermal conductivity and diffusivity of the nanofluids. By fitting the experimental data to the numerical simulation curve the thermal diffusivity and thermal conductivity of Chromium (Cr) in water, Ethylene Glycol and Ethanol were obtained. It is found that thermal conductivity and thermal diffusivity of Cr nanofluids in water, EG and Ethanol are higher than thermal conductivity and thermal diffusivity of respective base fluids.

5 citations

Proceedings ArticleDOI
01 Jan 2022
TL;DR: In this paper , a low-profile circular slot with a substrate integrated waveguide (SIW) antenna is given for wireless applications, which consists of a microstrip antenna with two circular-shape slots etched on the top of the radiation plane and stacked one on top of each other.
Abstract: For wireless applications, a low-profile circular slot with a substrate integrated waveguide (SIW) antenna is given. For bandwidth augmentation, the proposed antenna structure consists of a microstrip antenna with two circular-shape slots etched on the top of the radiation plane and stacked one on top of the other. An FR-4 substrate with a dielectric constant of 4.3 and a thickness of 1.5 mm was used to create this antenna. The optimised antenna design has a 13.2 GHz operating frequency, a 4.913 percent bandwidth, and a peak gain of roughly 6.05 dB over the operating frequency, making it appropriate for wireless communication applications with good matching characteristics. CST Microwave Studio is used to compute the design model and performance evaluation of a proposed antenna..

Cited by
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Journal ArticleDOI
TL;DR: Focusing mainly on dilute suspensions of well-dispersed spherical nanoparticles in water or ethylene glycol, recent experimental observations, associated measurement techniques, and new theories as well as useful correlations have been reviewed.
Abstract: Nanofluids, i.e., well-dispersed (metallic) nanoparticles at low- volume fractions in liquids, may enhance the mixture’s thermal conductivity, knf, over the base-fluid values. Thus, they are potentially useful for advanced cooling of micro-systems. Focusing mainly on dilute suspensions of well-dispersed spherical nanoparticles in water or ethylene glycol, recent experimental observations, associated measurement techniques, and new theories as well as useful correlations have been reviewed. It is evident that key questions still linger concerning the best nanoparticle-and-liquid pairing and conditioning, reliable measurements of achievable knf values, and easy-to-use, physically sound computer models which fully describe the particle dynamics and heat transfer of nanofluids. At present, experimental data and measurement methods are lacking consistency. In fact, debates on whether the anomalous enhancement is real or not endure, as well as discussions on what are repeatable correlations between knf and temperature, nanoparticle size/shape, and aggregation state. Clearly, benchmark experiments are needed, using the same nanofluids subject to different measurement methods. Such outcomes would validate new, minimally intrusive techniques and verify the reproducibility of experimental results. Dynamic knf models, assuming non-interacting metallic nano-spheres, postulate an enhancement above the classical Maxwell theory and thereby provide potentially additional physical insight. Clearly, it will be necessary to consider not only one possible mechanism but combine several mechanisms and compare predictive results to new benchmark experimental data sets.

434 citations

Journal Article
TL;DR: In this paper, an optical beam deflection technique was used for measurements of the thermal diffusivity of fluid mixtures and suspensions of nanoparticles with a precision of better than 1%.
Abstract: We describe an optical beam deflection technique for measurements of the thermal diffusivity of fluid mixtures and suspensions of nanoparticles with a precision of better than 1%. Our approach is tested using the thermal conductivity of ethanol-water mixtures; in nearly pure ethanol, the increase in thermal conductivity with water concentration is a factor of 2 larger than predicted by effective medium theory. Solutions of C60–C70 fullerenes in toluene and suspensions of alkanethiolate-protected Au nanoparticles were measured to maximum volume fractions of 0.6% and 0.35vol%, respectively. We do not observe anomalous enhancements of the thermal conductivity that have been reported in previous studies of nanofluids; the largest increase in thermal conductivity we have observed is 1.3%±0.8% for 4nm diam Au particles suspended in ethanol.

288 citations

Journal ArticleDOI
TL;DR: In this article, a brief overview of evolution in the use of nanofluids in some applications has been presented, and enhancements recorded experimentally are reviewed and summarized, including: nanoparticle concentration, size, shape and thermal conductivity.
Abstract: In many applications, there is a critical need for enhancing the poor thermal conductivity of conventional fluids in order to develop efficient heat transfer fluids. This requirement can be met through dispersing nanometric particles in a given base fluid such as water, ethylene glycol, oil or air. The resulting nanofluids enhanced thermal conductivity of the base fluids. In order to evaluate this enhancement, nanofluid thermal conductivity is required to be measured. Several methods and techniques are covered in the present contribution. In addition, enhancements recorded experimentally are reviewed and summarized. Different parameters affecting on such enhancement are covered, including: nanoparticle concentration, size, shape and thermal conductivity. In addition, base fluid type, nanofluid bulk temperature and dispersion techniques are also covered parameters. However, nanofluids have the potential to contribute in several practical applications including solar thermal, transportation, electronic cooling, medical, detergency and military applications. In the present work, a brief overview of evolution in the use of nanofluids in some applications has been presented. According to this contribution, there is a critical need for further fundamental and applications of nanofluids studies in order to understand the physical mechanisms of using nanofluids as well as explore different aspects of applications of nanofluids.

249 citations

Journal ArticleDOI
TL;DR: A comprehensive literature review on CO2 absorption enhancement by nanofluids is presented in this paper, which covers the preparation methods, enhancement mechanisms, and the enhancement factors of the gas-liquid system.

244 citations

Journal ArticleDOI
TL;DR: This review article systematically describes the various chemical synthesis routes followed by bottom-up approaches, surface morphologies, and detailed microstructure characteristics, and phase dependent thermal as well as optical properties for potential use of such materials in various applications.
Abstract: In this review, we discuss new developments and recent trends in both amorphous and crystalline Al2O3 oxide nanofluids related to their phase dependent characteristics in detail. Nowadays, nanofluids have gained significant attention with the enhanced energy/heat efficiency, which is highly desirable to improve the performance of any energy based devices and technology. This review article systematically describes the various chemical synthesis routes followed by bottom-up approaches, surface morphologies, and detailed microstructure characteristics, and phase dependent thermal as well as optical properties for potential use of such materials in various applications.

170 citations