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9th International and 49th National Conference on fluid Mechanics and fluid Power, FMFP 2022

作者： Kumar, Alok Maurya, Govind Ahmed, Nadeem Singh, Suneet Fluid Flow Systems Simulation Lab Department of Energy Science and Engineering IIT Bombay Mumbai400076 India

ISBN: (纸本)9789819978267

The majority of the thermo-physical processes are developed into a mathematical model, which is then linearized to give some insight into the operational characteristics. A model without linearization, however, can better capture the nature of the observed occurrences. Research has long focused on how to choose between a nonlinear model, which has a larger computing cost, and a linear model, which might not give true and accurate dynamics. For a pulsating heat pipe (PHP), the limitations of the linear model over the nonlinear model are discussed. The difference between the two models largely highlight the nonlinear model's ability to accurately represent real dynamics. Based on the finding of an additional Zero-Hopf point in the nonlinear model from (Kumar and Singh in IJTS 2023), an analysis of the possible presence of a hidden attractor is done. © 2024, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Dynamics

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Impact of the Phase Change Contributing Factors on the Dynamical Characteristics of a Pulsating Heat Pipe

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SSRN 2024年

作者： Kumar, Alok Singh, Suneet Fluid Flow Systems Simulation Lab Department of Energy Science and Engineering Indian Institute of Technology Bombay Mumbai400076 India

A theoretical investigation of the effect of the factors contributing to the phase change in the operation of a pulsating heat pipe has been conducted using a nonlinear mathematical model. With the help of bifurcation analysis and eigenvalue analysis, the identification of sudden change in the dynamic behaviour for varying factors (namely, phase change limit, wall temperature gradient, and evaporation rate) provides insightful revelations on the suitable combinations of these factors to harvest an optimized output to enhance the heat transfer mechanism. In accordance with the eigenvalue analysis, codimension one bifurcation analysis provides different regions with varying operating characteristics. In addition, codimension two bifurcation analysis has partitioned the parameter space into distinct regimes. The temporal evolution of the position of the liquid slug, which is determined by the phase change of the system, has shown that the evaporation rate has a very small unstable oscillatory regime, and therefore, is necessary to be kept in the unstable region to harvest a maximum heat output through the self-sustained oscillation. It has also indicated that any combination of the other two parameters provided that one of them is in an unstable region, is feasible for the continuous operation of PHP. © 2024, The Authors. All rights reserved.

关键词： Heat pipes

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