Effect of nanofluid concentration on two-phase thermosyphon heat exchanger performance

Cieśliński, Janusz T.

doi:10.1515/aoter-2016-0011

Cited by 14 publications

(10 citation statements)

References 27 publications

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“…In such cases heat transfer coefficients can be predicted if the method due to Wilson plot is applied [14]. The method is simple and has a wide potential for applications of different types of heat exchangers [15][16][17]. The classical Wilson method, as well as its modifications, requires only determination of the overall resistance in the heat exchanger and hence an accurate energy balance, based on measurement of flow rates of fluids exchanging heat and their mean temperature at inlet and outlet from heat exchanger.…”

Section: Wilson Plot Methodsmentioning

confidence: 99%

Heat transfer in plate heat exchanger channels: Experimental validation of selected correlation equations

Cieśliński

Fiuk²,

Typiński³

et al. 2016

Archives of Thermodynamics

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This study is focused on experimental investigation of selected type of brazed plate heat exchanger (PHEx). The Wilson plot approach was applied in order to estimate heat transfer coefficients for the PHEx passages. The main aim of the paper was to experimentally check ability of several correlations published in the literature to predict heat transfer coefficients by comparison experimentally obtained data with appropriate predictions. The results obtained revealed that Hausen and Dittus-Boelter correlations underestimated heat transfer coefficient for the tested PHEx by an order of magnitude. The Aspen Plate code overestimated heat transfer coefficient by about 50%, while Muley-Manglik correlation overestimated it from 1% to 25%, dependent on the value of Reynolds number and hot or cold liquid side.

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Section: Wilson Plot Methodsmentioning

confidence: 99%

Heat transfer in plate heat exchanger channels: Experimental validation of selected correlation equations

Cieśliński

Fiuk²,

Typiński³

et al. 2016

Archives of Thermodynamics

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“…Particularly of interest are the conditions for flow visualization regarding flat, two-dimensional configurations of flow [2]. Several issues, mentioned in the recent literature, are related to the influence of size [3,4], orientation [5][6][7] and surface [8][9][10][11][12][13] structure of the minigap on heat transfer and pressure drop and also to the passive methods [8,[14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Flow Boiling in Minigap in the Reversed Two-Phase Thermosiphon Loop

2019

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The paper presents the results of experimental investigations of a model of a heat exchanger featuring a minigap, which is perceived as an evaporator for an inverted thermosiphon. The system works with a single component test fluid. The tested evaporator generates pumping power in the test loop in a way similar to the mammoth pump. The tests regarded a module of the heat exchanger, consisting of a hot leg and a cold leg with the width by the length of 0.1 × 0.2 m, heated by a uniform heat flux. In the tests, the minigaps of 1, 2 and 3 mm were formed. Two fluids, namely, distilled water and ethanol, were tested in the facility. Two-phase flow structures for both working fluids and various operational parameters, together with comprehensive visualization material, are presented. The specifics of pressure changes and its influence on operating parameters and flow structure are discussed.

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“…[3][4][5]), however there is no clear theory on this matter [5] due to complexity of issue. Nevertheless, the nanofluids have a lot of potential in the energy sector through a heat transfer reinforcement, for example as the working media in the heat exchangers [6,7]. Addition of the particles is considered as the passive heat transfer enhancement method, while another way to intensify the processes of heat transport is application of an active method -e.g.…”

Section: Introductionmentioning

confidence: 99%

Extend of magnetic field interference in the natural convection of diamagnetic nanofluid

Roszko

Fornalik-Wajs

2017

Heat Mass Transfer

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Main objective of the paper was to experimentally investigate the thermo-magnetic convection of diamagnetic fluids in the Rayleigh-Benard configuration. For better understanding of the magnetic field influence on the phenomena occurring in cubical enclosure the following parameters were studied: absence or presence of nanoparticles (single and twophase fluids), thermal conditions (temperature difference range of 5-25 K) and magnetic field strength (magnetic induction range of 0-10 T). A multi-stage approach was undertaken to achieve the aim. The multi-stage approach means that the forces system, flow structure and heat transfer were considered. Without understanding the reasons (forces) and the fluid behaviour it would be impossible to analyse the exchanged heat rates through the Nusselt number distribution. The forces were determined at the starting moment, so the inertia force was not considered. The flow structure was identified due to the FFT analysis and it proved that magnetic field application changed the diamagnetic fluid behaviour, either single or two-phase. Going further, the heat transfer analysis revealed dependence of the Nusselt number on the flow structure and at the same time on the magnetic field. It can be said that imposed magnetic field changed the energy transfer within the system. In the paper, it was shown that each of presented steps were linked together and that only a comprehensive approach could lead to better understanding of magnetic field interference in the convection phenomenon.

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Effect of nanofluid concentration on two-phase thermosyphon heat exchanger performance

Cited by 14 publications

References 27 publications

Heat transfer in plate heat exchanger channels: Experimental validation of selected correlation equations

Heat transfer in plate heat exchanger channels: Experimental validation of selected correlation equations

Flow Boiling in Minigap in the Reversed Two-Phase Thermosiphon Loop

Extend of magnetic field interference in the natural convection of diamagnetic nanofluid

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