HEAT TRANSFER ENHANCEMENT CAUSED BY IMPINGING JETS OF Al2O33-WATER NANOFLUID ON A MICRO-PIN FIN ROUGHENED SURFACE UNDER CROSSFLOW CONDITIONS-A NUMERICAL STUDY

Allauddin, Usman; Jamil, Tariq; Shakaib, M.; Khan, H.; Mohiuddin, Rafay; Saeed, Munazza; Ahsan, Haseeb; Uddin, Naseem

doi:10.1615/jenhheattransf.2020033413

Cited by 8 publications

(4 citation statements)

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“…The increase in heat transfer coefficient and heat flux over the target plate makes the use of the nanoparticles appealing for applications where high heat extraction is required. Similar trends are also reported in a recent study 35 …”

Section: Resultssupporting

confidence: 92%

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Nanoscale heat transfer investigation of an array of impinging jet systems with different working fluids under crossflow with and without pin fins

et al. 2020

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In the current numerical study, the thermal and flow field performance of an array of confined multiple jets with air, water, and water-Al 2 O 3 nanofluid in the maximum crossflow configuration over the target plate with and without pin fins is investigated. The numerical results are validated with the experimental data; it is found that a reasonable prediction related to heat transfer can be made. For this study, steadystate Reynolds-averaged Navier-Stokes simulations with the shear-stress transport k ω turbulence model in ANSYS Fluent were performed. The simulations are performed with volumetric concentration ϕ = 0.2% to 3% and the jet's Reynolds number Re = 15 000 to 35 000. In all cases, the jet outlet-to-target plate distance Z D / is 3. It is found that the increase in values of the volumetric concentration of nanoparticles results in a decrease of the Nusselt number and an increase of the convective heat transfer coefficient. This is because there is an increase in thermal conductivity of the working fluid with the increase in the volumetric concentration of nanoparticles for the same Reynolds number. About 81.5% and 89.1% enhancement in the average heat transfer flux values is observed for flat and pin fin-roughened target plates, respectively, for ϕ = 3%.

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Section: Resultssupporting

confidence: 92%

“…Similar trends are also reported in a recent study. 35 Figure 11A,B show a comparison of the local Nusselt number contours for case A and case B, respectively, with air as the working fluid at Re = 35 000. A local cooling performance by impinging jets for both cases can be observed through these contours.…”

Section: Flow Fieldmentioning

confidence: 99%

Nanoscale heat transfer investigation of an array of impinging jet systems with different working fluids under crossflow with and without pin fins

et al. 2020

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“…summarized a variety of the experimentally measured thermal properties of common nanofluids, the enhancement mechanisms discovered or hypothesized, the models used for properties and heat transfer characteristics, and the applications of nanofluids for enhancing heat transfer. Allauddin et al (2020) numerically studied a micro-pin fin roughened target plate with multiple impinging jets of Al2O3-water nanofluid, and observed about 72% improvement in the heat transfer coefficient of the nanofluid at volumetric concentration of 3%. Çiftçi et al (2020) experimentally investigated hexagonal boron nitride material mixed with dichloromethane (h-BN/DCM) nanofluid pool in varying heater powers ranging from 50 to 350 W to study the boiling and condensation heat transfer, and found the increment rates in the heat transfer coefficient for saturation, superheat, and condensation conditions as 27.6%, 10.4%, and 17.65%, respectively, at an optimum nanoparticle concentration of 1.0%.…”

Section: Nanofluidsmentioning

confidence: 99%

“…Compound TechniquesMany studies used a combination of passive and active enhancement techniques Kumar et al (2020c). conducted an experimental study of Zinc Oxide/water/ethylene glycol-based nanofluid in a square duct roughened with inclined ribs for various sets of geometric and flow parameters Allauddin et al (2020). numerically investigated heat transfer enhancement caused by impinging jets of Al2O3-water nanofluid on a micro-pin fin roughened surface under crossflow and turbulent conditions Yang et al (2020a).…”

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confidence: 99%

Heat Transfer Enhancement-a Brief Review of Literature in 2020 and Prospects

et al. 2021

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This review provides a brief literature survey on enhanced heat transfer research published in the English language journals in 2020. A topic search containing either "heat transfer" or "heat transport" or "thermal transport" in the Web of Science resulted in over 28,000 papers published in 2020 and nearly 30% were relevant to heat transfer intensification, which indicates the importance and rapid development of heat transfer enhancement technologies. The chosen studies focus on various heat transfer enhancement research categorized into conduction, convection, radiation, boiling and condensation, energy storage, thermal management, and cross research involving two or more categories. Heat conduction papers are selected from the micro/nanoscale areas with a focus on interfacial phenomena. Important active, passive, and compound techniques for enhancing convective heat transfer are incorporated. Thermal radiation is concentrated on near-2 field radiation and solar energy. Heat transfer enhancement in boiling and condensation as well as in thermal energy storage, renewable and sustainable energy, and thermal management of electronics and high-end equipment is critical in many engineering applications. From the selected literature published in 2020, significant attempts have been made to research and development on heat transfer enhancement technology covering both conventional and emerging techniques. The prospects of the heat transfer enhancement research are reflected according to the literature survey.Research of innovative heat transfer enhancement techniques is immense, encompassing every aspect from understanding the fundamental theory and physical mechanisms of various heat transfer enhancement techniques to their applications. Research of emerging techniques using new interfacial materials, nanofluids, micro-and nano-structures, microchannels, and new compound enhancement techniques incorporating conventional and new techniques becomes popular.However, there are big challenges in understanding the mechanisms, engineering design methodology and applications with these emerging techniques. Many aspects are urgently needed to be investigated and developed to achieve systematic theory, mechanisms and design methodology for applications in thermal processes, energy storage, renewable energy, decarbonized heating and cooling and many industrial and civil sectors.

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