Experimental and numerical investigations of thermal characteristics of heat exchangers in oscillatory flow

Ilori, Olusegun M.; Jaworski, Artur J.; Mao, Xiaoan

doi:10.1016/j.applthermaleng.2018.07.073

Cited by 30 publications

(18 citation statements)

References 38 publications

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“…Briefly, the experimental results fit well with the predictions of even better three-dimensional CFD models [74], From this, it is presumed to teach that the CFD model is a reliable method for examining the effects of a number of design changes on the elements' performance, representing a cost-effective route for design optimization [73]. CFDs have become an effective tool in several heat exchangers; it is almost sure to be less expensive than experimental characterization studies [18].…”

Section: Cfd Modeling and Analysis Of The Phenomenonmentioning

confidence: 76%

Critical Review of the Theoretical, Experimental and Computational Fluid Dynamics Methods for Designing Plate Fin Heat Exchangers

Libreros¹,

Mercado²,

Ochoa³

et al. 2019

JESTR

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This paper presents a detailed review of the research carried out for the design of flat fin heat exchangers is using theoretical, experimental, and computational fluid dynamics (CFD) methods. The scope and limitations of several studies are presented, as well as the critical point of view of the authors in the selection of optimal methods in the thermo-hydraulic design of each equipment. Fin heat exchangers optimization is done using different approaches. The theoretical model assumes considerations that do not fully replicate the phenomenon, the experimental method provides real parameters for the design and implies high costs, and finally, computational fluid dynamics predicts the behaviors of thermal and hydraulic machine flows, in addition to recreating the phenomena almost exactly and complement the theoretical and experimental methods. With this review, it can be verified that the methods complement each other, thus achieving greater profitability at the industrial level, greater robustness in the design, and facilitating the study of behavior from a thermo-hydraulic approach.

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Section: Cfd Modeling and Analysis Of The Phenomenonmentioning

confidence: 76%

Critical Review of the Theoretical, Experimental and Computational Fluid Dynamics Methods for Designing Plate Fin Heat Exchangers

Libreros¹,

Mercado²,

Ochoa³

et al. 2019

JESTR

View full text Add to dashboard Cite

show abstract

“…Experiments involving standing wave devices with two identical HXs and no stack in between were conducted by Kamsanam et al [10] and Ilori et al [11] to investigate the thermal performance of HXs of the parallel-plate type and parallel tube type. The derived correlation laws were expressed in terms of Nusselt numbers.…”

Section: Of 10mentioning

confidence: 99%

Convection Heat Transfer Coefficients in Thermoacoustic Heat Exchangers: An Experimental Investigation

2019

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This paper investigates the thermal performance of thermoacoustic heat exchangers subjected to acoustically oscillating flows. The analysis is carried out by experimental measurements of the heat fluxes sustained by the ambient heat exchanger of a prime mover of the standing wave type. A home-made parallel-plate heat exchanger is considered for the study. The gas-side convection heat transfer coefficients expressed as Nusselt numbers are determined over a wide range of velocity amplitudes of the oscillating flow. The experimental results are then compared to the predictions of a number of theoretical models currently applied in thermoacoustics such as the time-average steady-flow equivalent (TASFE) model, the root mean square Reynolds number (RMS-Re) model, and the boundary layer conduction model. The comparison suggests that the boundary layer model performs better than the rms-Re and TASFE models in predicting the heat transfer coefficients in oscillating flows. The relative difference between the model predictions and the experimental data amounts to 19%. A new correlation law, based on regression of the experimental data, is also proposed.

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“…Therefore, a lot of attention has been devoted so far in the literature to the PDE-based modeling of these thermal devices, which are often described by hyperbolic equations resulting from the balance laws of continuum physics. The development of the PDE-based phenomenological modeling methods progressed in two parallel directions, with the use of either analytical [1][2][3][4][5][6][7][8] or numerical [9][10][11][12][13][14][15] approaches. The other approach consists of using data-based techniques, also known as black-box modeling or process identification [16][17][18], or even in using artificial neural networks [19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Rational Transfer Function Model for a Double-Pipe Parallel-Flow Heat Exchanger

Bartecki

2020

Symmetry

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Transfer functions of typical heat exchangers, resulting from their partial differential equations, usually contain irrational functions which quite accurately describe the spatio-temporal nature of the processes occurring therein. However, such an accurate but complex mathematical representation is often not convenient from the practical point of view, and some approximation of the original model would be more useful. This paper discusses approximate rational transfer functions for a typical thick-walled double-pipe heat exchanger working in the parallel-flow configuration. Using the method of lines with the backward difference scheme, the original symmetric hyperbolic partial differential equations describing the heat transfer phenomena are transformed into a set of ordinary differential equations and expressed in the form of N subsystems representing spatial sections of the exchanger. Each section is described by a rational transfer function matrix and their cascade interconnection results in the overall approximation model expressed by a matrix of rational transfer functions of high order. Based on the rational transfer function representation, the frequency and steady-state responses of the approximate model are evaluated and compared with those resulting from its original irrational transfer function model. The presented results show better approximation quality for the “crossover” input–output channels where the in-domain heat conduction effects prevail as compared to the “straightforward” channels, where the transport delay associated with the heat convection dominates.

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Experimental and numerical investigations of thermal characteristics of heat exchangers in oscillatory flow

Abstract: This is a repository copy of Experimental and numerical investigations of thermal characteristics of heat exchangers in oscillatory flow.

Cited by 30 publications

References 38 publications

Critical Review of the Theoretical, Experimental and Computational Fluid Dynamics Methods for Designing Plate Fin Heat Exchangers

Critical Review of the Theoretical, Experimental and Computational Fluid Dynamics Methods for Designing Plate Fin Heat Exchangers

Convection Heat Transfer Coefficients in Thermoacoustic Heat Exchangers: An Experimental Investigation

Rational Transfer Function Model for a Double-Pipe Parallel-Flow Heat Exchanger

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