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Hussein A. Mohammed

Bio: Hussein A. Mohammed is an academic researcher from Edith Cowan University. The author has contributed to research in topics: Nanofluid & Heat transfer. The author has an hindex of 47, co-authored 190 publications receiving 6485 citations. Previous affiliations of Hussein A. Mohammed include University College of Engineering & Universiti Teknologi Malaysia.


Papers
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Journal ArticleDOI
TL;DR: In this paper, a comprehensive review on the work done regarding to heat transfer and fluid flow characteristics in microchannels heat exchanger using conventional fluids as well as nanofluids is also described.
Abstract: Advancement in the electronics industry led to the development of microscale heat transfer devices which offered high heat transfer coefficient in a compact size. Nevertheless, the heat transfer characteristics were limited by the heat transfer fluids that were used. The recent development of nanotechnology led to the concept of using suspended nanoparticles in heat transfer fluids to improve the heat transfer coefficient of the base fluids. The amount of research done in this particular field is fairly new and limited. Most studies done on microchannel devices and nanofluids recently have reported enhanced heat transfer capabilities and results that challenge traditional theories and limitations on heat transfer devices and fluids. Several important aspects of microchannel heat exchangers that affect the performance such as channel geometry, fluid inlet and outlet arrangement, type of construction were discussed together with the reported findings from experimental, numerical and theoretical literatures. This review also focuses on the important aspects of nanofluids such as types, properties and heat transfer characteristics and limitations towards the application of nanofluids. Apart from that, a comprehensive review on the work done regarding to heat transfer and fluid flow characteristics in microchannels heat exchanger using conventional fluids as well as nanofluids is also described.

258 citations

Journal ArticleDOI
TL;DR: In this article, the effect of using a wavy flow channel on the MCHS thermal performance, the pressure drop, the friction factor, and wall shear stress is reported.

246 citations

Journal ArticleDOI
TL;DR: In this article, thermal properties of nanoparticles suspended in refrigerant and lubricating oil of refrigerating systems were reviewed and review results are presented as well, and challenges and future direction of nanofluids/nanorefrigerants have been reviewed and presented in this paper.
Abstract: Recently scientists used nanoparticles in refrigeration systems because of theirs remarkable improvement in thermo-physical, and heat transfer capabilities to enhance the efficiency and reliability of refrigeration and air conditioning system. In this paper thermal–physical properties of nanoparticles suspended in refrigerant and lubricating oil of refrigerating systems were reviewed. Heat transfer performance of different nanorefrigerants with varying concentrations was reviewed and review results are presented as well. Pressure drop and pumping power of a refrigeration system with nanorefrigerants were obtained from different sources and reported in this review. Along with these, pool boiling heat transfer performance of CNT refrigerant was reported. Moreover, challenges and future direction of nanofluids/nanorefrigerants have been reviewed and presented in this paper. Based on results available in the literatures, it has been found that nanorefrigerants have a much higher and strongly temperature-dependent thermal conductivity at very low particle concentrations than conventional refrigerant. This can be considered as one of the key parameters for enhanced performance for refrigeration and air conditioning systems. Because of its superior thermal performances, latest upto date literatures on this property has been summarized and presented in this paper as well. The results indicate that HFC134a and mineral oil with TiO2 nanoparticles works normally and safely in the refrigerator with better performance. The energy consumption of the HFC134a refrigerant using mineral oil and nanoparticles mixture as lubricant saved 26.1% energy with 0.1% mass fraction TiO2 nanoparticles compared to the HFC134a and POE oil system. It was identified that fundamental properties (i.e. density, specific heat capacity, and surface tension) of nanorefrigerants were not experimentally determined yet. It may be noted as well that few barriers and challenges those have been identified in this review must be addressed carefully before it can be fully implemented in refrigeration and air conditioning systems.

245 citations

Journal ArticleDOI
TL;DR: The effect of geometrical parameters on water flow and heat transfer characteristics in microchannels is numerically investigated for Reynolds number range of 100-1000 in this article, where three different shapes of microchannel heat sinks are investigated.

241 citations

Journal ArticleDOI
TL;DR: In this paper, a comprehensive review on applications of variable speed drive (VSD) in electrical motors energy savings is presented, where economic analysis, payback period and the effect of current and voltage harmonics generated by VSDs are presented.
Abstract: Most motors are designed to operate at a constant speed and provide a constant output; however, modern technology requires different speeds in many applications where electric motors are used. A variable speed drive (VSD) is a device that regulates the speed and rotational force, or output torque of mechanical equipment. Effects of applying VSDs are in both productivity improvements and energy savings in pumps, fans, compressors and other equipment. Variable speed drive technology and the importance of controlling the speed of existing motors have fascinated many attentions in the last years with the advent of new power devices and magnetic materials. This paper is a comprehensive review on applications of VSD in electrical motors energy savings. The aim is to identify energy saving opportunities and incorporated costs of applying variable speed drives to the existing applications of electrical motors. Subsequently, economic analysis, payback period and the effect of current and voltage harmonics generated by VSDs are presented. Authors are hopeful to provide useful information for future variable speed drive applications like fans, pumps, chillers, ventilators and heaters.

229 citations


Cited by
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01 Jan 2007

1,932 citations

Book ChapterDOI
30 Dec 2011
TL;DR: This table lists the most common surnames in the United States used to be Anglicised as "United States", then changed to "United Kingdom" in the 1990s.
Abstract: OUTPU T 29 OUTPU T 30 OUTPU T 31 OUTPU T 32 OUTPU T 25 OUTPU T 26 OUTPU T 27 OUTPU T 28 OUTPU T 21 OUTPU T 22 OUTPU T 23 OUTPU T 24 OUTPU T 17 OUTPU T 18 OUTPU T 19 OUTPU T 20 OUTPU T 13 OUTPU T 14 OUTPU T 15 OUTPU T 16 OUTPU T 9 OUTPU T 10 OUTPU T 11 OUTPU T 12 OUTPU T 5 OUTPU T 6 OUTPU T 7 OUTPU T 8 OUTPU T 1 OUTPU T 2 OUTPU T 3 OUTPU T 4 29 30 31 32 25 26 27 28 21 22 23 24 17 18 19 20 13 14 15 16 9

1,662 citations

01 Jan 2016

1,633 citations

Journal ArticleDOI
TL;DR: In this article, the authors investigated the effects of nanofluids on the performance of solar collectors and solar water heaters from the efficiency, economic and environmental considerations viewpoints, and made some suggestions to use the nanoparticles in different solar thermal systems such as photovoltaic/thermal systems, solar ponds, solar thermoelectric cells, and so on.

1,069 citations

Journal ArticleDOI
TL;DR: In this article, a magnetophoretically formed high aspect ratio nano-nodes are used for hot-spot cooling in microfluidic environments, which can be dynamically chained and docked onto the hot spots to establish tuneable high-aspect ratio nanofins for the heat exchange between these hot spots and the liquid coolant.
Abstract: The limitation of hot spot cooling in microchips represents an important hurdle for the electronics industry to overcome with coolers yet to exceed the efficiencies required. Nanotechnology-enabled heat sinks that can be magnetophoretically formed onto the hot spots within a microfluidic environment are presented. CrO2 nanoparticles, which are dynamically chained and docked onto the hot spots, establish tuneable high-aspect-ratio nanofins for the heat exchange between these hot spots and the liquid coolant. These nanofins can also be grown and released on demand, absorbing and releasing the heat from the hot spots into the microfluidic system. It is shown that both high aspect ratio and flexibility of the fins have a dramatic effect on increasing the heat sinking efficiency. The system has the potential to offer a practical cooling solution for future electronics.

855 citations