Heat Transfer Enhancement of Different Channel Geometries Using Nanofluids and Porous Media

Azzawi, Itimad D. J.; Yahya, Samir Gh.; Al-Rubaye, Layth Abed Hasnawi; Ali, Senaa Kh.

doi:10.18280/ijht.390417

Cited by 3 publications

(2 citation statements)

References 35 publications

(42 reference statements)

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“…The heat transfer coefficient was found to increase by 6% with a low pressure drop for the Al2O3/H2O nanofluid at the volume fraction of 0.5% compared to the base fluid. Azzawi et al [17] numerically investigated the effect of three different nanofluids Al2O3/water, CuO/water and SiO2/water in the analysis and compared to pure water to enhance the convective heat transfer of the base fluid. Varying volumes of fraction flowing within different channel geometries, exposed to a uniform and different hot surface temperatures boundary condition, was successfully carried out in this study using a single-phase approach.…”

Section: Introductionmentioning

confidence: 99%

Design of Nanofluid-Based Spring Water/Tap Water and Nanoparticles of Fe2O3/ZnO as a Coolant for the Engines

Faisal,

Abdullah Mohammed

2023

DJES

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In this work, an experimental system was established to measure the heat transfer characteristics, including the heat transfer coefficient, overall heat transfer, Nusselt number, and thermal conductivity. The investigation focused on spring water and tap water-based nanofluids containing Fe2O3 and ZnO nanoparticles with particle sizes of 50 nm and 70 nm, respectively. The experiments were conducted inside an automobile engine, studying the effects of varying nanoparticle volume fractions at a constant temperature. Fe2O3 and ZnO concentration in the respective based fluids was verified between 0.02 % and 0.08 % v/v and 0.01 and 0.07 %, respectively. The spring water is not so far used in the previous studies and is much more available in Kurdistan region. Reynolds numbers of nanofluids inside the engine were considered between 1000 to 8000 in a different range as that of the literature review. Reynolds analogy for heat and momentum has been employed in this study. It was observed that the thermo-physio-mechanical properties of nanofluids increased with increase in the concentration of nanoparticles and Reynolds number. However, the friction factor decreased with increasing Reynolds number but increased with an increasing volume concentration of nanoparticles. Generally, the results showed that the enhancement of the effective heat transfer of the nanofluids reached 46%, the overall heat transfer coefficient reached 39%, thermal conductivity reached 21.35% and Nusselt number reached to 38%. at 0.08% volume fraction of Fe2O3/spring water nanofluid. Based on all previous parameters estimated, the designed nanofluids in this study could be classified as a workable nanofluid in many industry applications

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Section: Introductionmentioning

confidence: 99%

Design of Nanofluid-Based Spring Water/Tap Water and Nanoparticles of Fe2O3/ZnO as a Coolant for the Engines

Faisal,

Abdullah Mohammed

2023

DJES

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“…When compared to other materials, CuO nanofluid had the highest thermal efficiency. In addition, the thermal performance of Al 2 O 3 , CuO, and SiO 2 nanofluids in a spiral heat exchanger has been analyzed [16] [17]. numerically evaluated Al2O3/water, CuO/water, and SiO2/water nanofluids (2%, 4%, and 6% volume fractions) in different channel geometries under uniform and varying hot surface temperatures.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Investigations on the Heat Transfer of a Helical Coil Heat Exchanger Utilized α-Al2 O3 nanofluid

Abdullah,

Hussein

2023

DJES

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This study focused on investigating the impact of α-Al2O3 nanoparticles on heat transfer in shell and helical coiled tube heat exchangers. The objective was to analyze the influence of various geometrical characteristics, specifically the coil pitch, on the Nusselt numbers of both sides using a combination of numerical simulations and experimental methods. The working fluid for the hot side was water. The research encompassed an examination of the friction factor for three different coils, exploring the effects of pitch spacing on heat transfer, and assessing the influence of nanoparticles on heat transfer on the inner side of the coil. The findings of the current work indicated significant improvements in heat transfer parameters when employing water-α-Al2O3 nanoparticles as the cold fluid. Comparing this heat exchanger to one without the inclusion of α-Al2O3 nanoparticles revealed a remarkable efficiency enhancement of 7.68 percent. This increase strongly suggests a notable acceleration in the rate of heat transmission within the heat exchanger. Overall, this study provides valuable insights into the utilization of α-Al2O3 nanoparticles in enhancing heat transfer in shell and helical coiled tube heat exchangers. The results highlight the potential benefits of incorporating nanoparticles into such systems, leading to improved performance and more efficient heat exchange processes.

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Hydrothermal Performance Maximisation and Entropy Generation Minimisation of Different Perforated Pinned Heat Sink Designs for Electronic Cooling

Khalil

Azzawi

Al‐damook

et al. 2022

Journal of Heat Transfer

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To quantify the benefits of reducing entropy production and improving hydrothermal performance with varied thermal air characteristics through different perforated heat sinks, a numerical study was conducted. Various numbers of circular perforations are studied from 0 perforations to 5 perforations. In addition, perforation configuration is considered, such as circular (3CP), square (3SP), elliptic (3EP), and triangular (3TP) perforated pinned heat sinks, as well as three slotted pinned heat sinks (3S, 6S, and 10S) and four notched pinned heat sinks (3S, 6S, and 10S) (2.5N, 5N, 7.5N and 10N). The numerical results showed that the 5-circular perforations heat sink model (5CP) generates the minimum entropy generation and the maximum hydrothermal performance (HTP), around 17% and 1.2, respectively compared to the zero-perforation model, while the circular perforated pinned heat sink (3CP) model produces the maximum reduction in entropy generation, generally around 13% with moderated HTP of 1.1. Moreover, when comparing slotted and notched pinned heat sinks, the 10S slotted and 10N notched pinned heat sinks achieve 1.45 of HTP.

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Heat Transfer Enhancement of Different Channel Geometries Using Nanofluids and Porous Media

Cited by 3 publications

References 35 publications

Design of Nanofluid-Based Spring Water/Tap Water and Nanoparticles of Fe2O3/ZnO as a Coolant for the Engines

Design of Nanofluid-Based Spring Water/Tap Water and Nanoparticles of Fe2O3/ZnO as a Coolant for the Engines

Experimental and Numerical Investigations on the Heat Transfer of a Helical Coil Heat Exchanger Utilized α-Al2 O3 nanofluid

Hydrothermal Performance Maximisation and Entropy Generation Minimisation of Different Perforated Pinned Heat Sink Designs for Electronic Cooling

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