Faculty Publications

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Author: search.filters.author.Narendran, G.

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    Numerical study of TiO2 nanofluid in multistage-bifurcated microchannel subjected to hotspots
    (Pleiades journals, 2019) Kumar, A.; Narendran, G.; Arumuga Perumal, D.A.
    The present study discusses implementation of multiple passive structures along the flow length using TiO2 nanofluid with 0.1% volume fraction to analyze a multistage-bifurcated microchannel. Fully developed laminar flow for different multistage plate configurations is used for the computational study, and additional investigations were done to evaluate pressure drop for Reynolds Number ranging from 250 to 500. Two different heat fluxes have been used: 4000 W/cm2 given for hotspot area and 1000 W/cm2 for the entire heat sink. Furthermore, the influence of flow rate on bifurcation stages combined with hotspot is highly investigated. Also, the pressure drop, temperature distribution, and flow streamlines are studied to evaluate cooling performance. © Springer Nature Singapore Pte Ltd. 2019.
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    Experimental and numerical investigation on conjugate effects in deep parallel microchannel using tio2 nanofluid for electronic cooling
    (Dalian University of Technology, 2018) Narendran, G.; Gnanasekaran, N.; Arumuga Perumal, D.A.
    The present study reports the numerical investigation of laminar forced convection based on TiO2 nanofluid in a rectangular copper microchannel surrounded by Aluminium block to examine the cooling effects for increased flow rates and particle concentration. The analysis involves the use of pure fluid and TiO2 nanofluid with the volume fractions of 0.01, 0.15, 0.20 and 0.25% for different flow rates. The study also examines the influence of conjugate heat transfer behavior of the microchannel using commercially available software FLUENT-15. © 2018 by the authors of the abstracts.
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    Numerical simulation of microgap based focal brain cooling bioimplants for treatment of epilepsy
    (Dalian University of Technology, 2018) Narendran, G.; Kumar, A.; Gnanasekaran, N.; Arumuga Perumal, D.A.
    Epilepsy is most common neurological disorder that affects people of all ages and around 30% of the patients do not recover because of existing treatment like medication therapy and surgery. Due to imprudent neuronal activities, excessive heat is observed at epileptic focus and to cool this focal cerebral cooling system is used. Our aim of this study is to enhance the existing design of focal cerebral cooling system by adding constructional structures there by creating micro gaps throughout the cooling device. In this study computational model is developed to perform transient analysis on flow hydrodynamics and heat transfer using commercial package ANSYS FLUENT 15.0. © 2018 by the authors of the abstracts.
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    Flow induced hotspot migration studies with heat spreader integrated microchannels using reduced graphene oxide nanofluids
    (Institute of Electrical and Electronics Engineers Inc., 2018) Narendran, G.; Gnanasekaran, N.; Arumuga Perumal, D.A.
    The present study involves experimental and numerical investigations of laminar forced convection in parallel microchannel heat sink accompanied with heat spreader of size 30 mm2. Water and reduced graphene oxide nanofluid of 0.07-0.12 vf % is used as working fluid. The numerical study is performed by incorporating the thermo physical properties of reduced graphene oxide nanofluid for different Reynolds number (Re) ranging from 150 to 360 for a constant heat flux of 35 W/cm2. Additionally, studies on migration of hotspot with heat spreader from the bottom of the heat sink under varying Reynolds number are also discussed. © 2018 IEEE.
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    Entropy generation study of TiO2 nanofluid in microchannel heat sink for Electronic cooling application
    (Institute of Physics Publishing helen.craven@iop.org, 2018) Kumar, A.; Narendran, G.; Arumuga Perumal, D.A.
    Development of Micro-electro-mechanical systems (MEMS) in the recent years has motivated and necessitated the study of flows in micro-scale geometries such as microchannel. Thermal management in ultra-densely packed electronic devices is highly essential to increase the reliability of the component without compromising packaging. The present study provides an experimental and numerical investigation on laminar forced convection in parallel microchannel heat sink accompanied with integrated Aluminium bulk heat spreader and ultrafine TiO2 nanoparticle based nanofluid for different wt. % ranging from 0.1-0.35 under different power ratings. Numerical study is performed to understand the flow hydrodynamics in microchannel to investigate the temperature distribution in bulk heat spreader with increased flow rates by implementing the thermo-physical properties. Furthermore, a study on Exergy and entropy generation for different fluids is also discussed. The experimental studies reveal that parallel microchannel increases the effectiveness of integrated cooling with a marginal temperature deviation between the heat sink and Aluminium bulk for a distance of 1.5 mm. Implementation of TiO2 nanofluid registered as a better working fluid than the pure fluid for all the experimental settings. © Published under licence by IOP Publishing Ltd.
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    Hydrodynamic Performance of Graphene Oxide nanofluid in heat spreader integrated microchannel
    (Toronto Metropolitan University, 2019) Narendran, G.; Gnanasekaran, N.; Arumuga Perumal, D.A.
    Thermal design consideration is highly essential for managing advanced microprocessors which are subjected to conjugate heat transfer under high heat flux with a minimal area for cooling. These multicore processors develop a localized high density heat flux referred as hotspot. It is often reported that the flow hydrodynamics in the channels thrive the hotspot zones in the microchannel heat sink (MHS) that effectively reduces the cooling performance in advanced 3D processors with varying power map cores. In this present study an experimental setup was developed to investigate the flow hydrodynamic and conjugate heat transfer performance of rectangular microchannel by using a thin heat spreader. Graphene Oxide nanofluid is used as the working fluid with three volume fractions (0.02%, 0.07% and 0.12%) for increased Reynolds number range from 150 to 260. Figure of Merit on thermal performance of nanofluid based on different influential factors has been investigated and the best suited nanofluid under various circumstances was found to be 0.12%-Graphene Oxide. © 2019, Toronto Metropolitan University. All rights reserved.
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    Migration of flow inducted hotspot with heat spreader integrated microchannel subjected to asymmetric heat flux: A Multiphysics approach
    (Institute of Electrical and Electronics Engineers Inc., 2019) Narendran, G.; Gnanasekaran, N.; Arumuga Perumal, D.A.
    The heat spreader integrated microchannel heat sink is employed in thermal management of transient hotspot problem in multicore processors for high density electronic cooling application. The heat transfer characteristics of heat spreader integrated microchannel were comprehensively analyzed experimentally and numerically, and their effectiveness and thermal enhancement factor was compared with the regular microchannel. By using deionized water and Graphene oxide (GO) nanofluid as working fluid, investigations were conducted for Reynolds number ranging from 100-300. Multiple hotspot cores were modelled in the microchannel with four different heat fluxes to study the temperature responses in the heat spreader under transient thermal loads. Additionally, studies were conducted to address the thermal stress developed in the packaging of heat spreader integrated microchannel in multiple hotspot conditions. The result shows that the thermal effectiveness of GO-0.12% increased 65% as compared with pure fluid. © 2019 IEEE.
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    A review on recent advances in microchannel heat sink configurations
    (Bentham Science Publishers, 2018) Narendran, G.; Gnanasekaran, N.; Arumuga Perumal, D.A.
    A qualitative observation has been undergone to review the various geometries of a microchannel that has been reported for the last two decades in literature majorly for the application of high power devices. Recent research on microchannel is more focused on numerical and experimental work with various configurations of the heat sink. In this paper, a comparative work on different flow geometries used in the microchannel and their influence on heat transfer and pressure drop is investigated with the brief representation of different working fluids used in microchannel heat sink for the purpose of electronic cooling and their associated performance characteristics with various examined parameters. Background: The microchannel cooling is an established cooling technique for high power electronic components which effectively enhances the performance of the high power devices. Objective: This article presents a general overview of microchannels with novel constructional bifurcations structures with related patents. Further, the influential parameter on thermal and flow characteristics with greater depth is also reviewed by authors. Methods: This review directs by presenting standard and benchmark investigation in the microchannel and different working parameters continued with recent studies. Further, it is addressed with the application of electronic cooling with latest patents using bifurcations and fractal microchannels. Result: The current situation of 3D cooling requires a robust cooling system to accommodate increased heat flux without compromising the packaging. Moreover, the recently developed patents also evolved with improved thermal load handling under constrained packaging. Conclusion: The advanced microchannel cooling with an optimized fluid handling system with effective packaging results in a highly effective heat dissipation system. © 2018 Bentham Science Publishers.
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    Experimental analysis on exergy studies of flow through a minichannel using Tio2/Water nanofluids
    (Elsevier Ltd, 2018) Narendran, G.; Bhat, M.M.; Akshay, L.; Arumuga Perumal, D.A.
    The present study involves an experimental investigation on rectangular minichannel heat sink for processor cooling of a workstation. The thermal dissipation power of the corresponding system is 25 W. The heat sink is directly in contact to the processor core and subjected to continuous increase in heat flux to the sink depending on the system loading. Water and TiO2 nanofluid with volume fraction of 0.10%, 0.15%, 0.21% and 0.25% is used as the cooling fluid in the experiments with different volume flow rates with a pulsating pump in the range of 210–400 ml/min respectively. The observations were performed with the sink in both horizontal and vertical position in which heat sink is allowed to reach two different temperature limits of 40 °C and 55 °C above which it is subjected to cooling. The Increase in minichannel efficiency was noticed when flowrate increased from 210 ml/min to 280 ml/min with an increment of 53%, but it started to reduce when flow rate approaches 360 ml/min. The outlet exergy and pumping power increases as the flow rate increases to a limit. Furthermore, decrease in efficiency was noticed beyond flow rate of 360 ml/min and the highest outlet exergy was found at a flow rate of 360 ml/min for about 147.52 W. Additionally, exergy analysis is performed for pure fluid under different flow conditions were examined. Further the effect of nanofluid on pressure drop subjected to pulsating flow for varying volume concentrations is also presented. © 2018 Elsevier Ltd
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    A review of lattice boltzmann method computational domains for micro-and nanoregime applications
    (Begell House Inc., 2020) Narendran, G.; Arumuga Perumal, A.P.; Gnanasekaran, N.
    In the last two decades, microscale and nanoscale devices have received much interest due to the inevitable performance and their numerous applications not only in the field of fluid flow and heat transfer but also in bio-technology, bio-medical engineering, etc. In many situations, besides the conventional experiments and theoretical analysis, computations have emerged as a valuable tool for investigating the fluid transport and heat transfer phenomena. The lattice Boltzmann method (LBM) has emerged as an important option for micro-and nanoscale devices due to the fact that the LBM is well established for the range of Knudsen number. A comparative study on several working fluids used in the field of micro-and nanodevices such as microchannel, micro-cavity, microboiling, and nanochannel is categorized. Various aspects of nanofluids used in natural convection with different cavity configurations, flow boiling, immiscible fluids, liquid–vapor phase change are also critically reviewed. Different remarks and findings of available numerical results with several investigated parameters were summarized. © 2020 Begell House, Inc.