Faculty Publications

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Author: search.filters.author.Gnanasekaran, G.Subject: search.filters.subject.Fins (heat exchange)

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    Numerical analysis of multiple phase change materials based heat sink with angled thermal conductivity enhancer
    (Elsevier Ltd, 2022) Nedumaran, M.; Gnanasekaran, G.; Hooman, K.
    Phase change materials (PCM) RT-28HC, RT-35HC, and RT-44HC with three different melting temperatures, 29 °C, 36 °C, and 44 °C, with similar thermal properties, are considered. The PCM is oriented from the left to right side of the heat sink in its increasing order. The fins are attached to the heat sink longitudinally, and its orientation effects are studied low (100–500 W/m2) and high (1000–5000 W/m2) heat fluxes applied on the horizontal bottom surface of the heat sink. A 2D model is developed using ANSYS Fluent 19, and the fin orientation effects are investigated numerically. The orientation of fins at different angles such as 0°, +15°, +30°, +45°, +60°,-15°,-30°,-45°, −60° are considered. The effect of fins on the charging cycle is assessed by comparing a single and double PCM heat sink. Three initial conditions are investigated by altering the initial temperature 300 K, 303 K, and 310 K. At increasing heat input, the negative angled fins possess a higher melting rate. For different initial conditions, −60° provides higher enhancement, and +60° possesses prolonged melting for almost all cases. The performance of a triple PCM design is compared with single and double PCM counterparts under similar conditions. © 2022 The Authors
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    Comprehensive Analysis of Hybrid Heat Sinks with Phase Change Materials for Both Charging and Discharging Cycles
    (Taylor and Francis Ltd., 2023) Nedumaran, M.; Gnanasekaran, G.
    Most of the studies investigated either charging or discharging process in a phase change material (PCM) based heat sink. In this paper, both melting and solidification of n-eicosane filled heat sink is studied numerically. The system filled only with PCM is unable to provide desired performance because of poor thermal conductivity of material. In order to enhance the response time, fins and foams are used in this study. Here, a PCM filled hybrid system of two cases is considered. For case 1, the heat sink with horizontal and vertical fins and for case 2, the heat sink with combination of horizontal fins and metal foams (aluminum) are employed. In case 1, no fin case is compared with rectangular fins and tapered fins. Results show that tapered fins are good for distribution of temperature within the system. In case 2, different filling heights such as 10 mm, 15 mm, and 20 mm with horizontal tapered fins are investigated. From the results, it is observed that the convection is delayed by increasing the filling heights. For solidification cases, 20 mm filling height foam performs better than all other cases. © 2022 Taylor & Francis Group, LLC.
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    Analytical investigation on thermo hydraulic performance augmentation of triangular duct solar air heater integrated with wavy fins
    (Taylor and Francis Ltd., 2023) Renald, T.R.; P, S.; Matheswaran, M.; Gnanasekaran, G.
    Present work deals with performance improvement of triangular duct solar air heater by integration of wavy fin on absorber plate. An analytical model has been developed for the investigation of design parameters such as fin pitch ratio with ranges 0.05–0.2 and fin amplitude ratio with ranges 0.025–0.125. MATLAB code is generated to solve the energy balance equations by iterative procedure. The influence of design parameters on effective thermal and thermal efficiency is presented and its influences are discussed. Increasing the fin pitch ratio decreases the thermal and thermo hydraulic efficiency drastically. The positive effect of fin amplitude ratio is observed; increasing of fin amplitude ratio improves the thermal efficiency and effective efficiency up to the critical Reynolds number. The peak thermal efficiency of 85% is observed and thermo hydraulic efficiency of 80.16% is found at fin pitch ratio of 0.05 and fin amplitude ratio of 0.125. The maximum thermo hydraulic performance enhancement is 15.7% as it compared simple conventional solar triangular duct air extractors. The design plots are developed to select the performance parameters to attain required temperature rise values. © 2022 Taylor & Francis Group, LLC.