Simulation of particle deposition in a plate-fin heat exchanger using a particle deposition model with a random function method

Xu, Zhiming; Sun, Aodi; Han, Zhiyu; Yu, Xiaoli

doi:10.1016/j.powtec.2019.07.031

Cited by 20 publications

(5 citation statements)

References 41 publications

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“…Таким образом, в работе показано, что рассматриваемая задача о формировании осадка на плоском ребре неограниченной высоты имеет автомодельное решение, которое может быть представлено в виде безразмерной функции одной переменной, единой для всех наборов исходных параметров (t 0 , t s , λ 0 , k, λ p , δ p ). Размерные значения толщины слоя осадка и температуры в каждой точке ребра в любой момент времени легко находятся по этой функции через элементарные соотношения (7), (8), с использованием при необходимости выражения ( 14) или (13). Вид автомодельного решения представлен графически на рисунке 1.…”

Section: результаты и обсуждениеunclassified

“…Однако из-за сложности реализации физического эксперимента и финансовых затрат, большинство исследователей используют методы численного моделирования для изучения механизмов осаждения твердых частиц [4] и их влияние на процесс теплопередачи [5,6]. В последнее время научные знания в области математического моделирования значительно продвинулись, поэтому численные исследования по прогнозированию осаждения твердых частиц на поверхностях теплообменных аппаратов [7][8][9] является важной и актуальной задачей.…”

Section: Introductionunclassified

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Features of solving the problem of condensation of vapor containing solid particles on the edge

Yakimov

Дмитриев

Badretdinova

et al. 2022

«Izvestiya vysshikh uchebnykh zavedenii. PROBLEMY ENERGETIKI»

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THE PURPOSE. To evaluate the effect on the condensation process of contaminants contained in the steam and deposited on the surface of the cooled fins, for which to formulate a mathematical model of the process, to investigate its properties and to obtain quantitative estimates of the characteristics.METHODS. The equations of the mathematical model are based on the laws of conservation of energy and mass, their study and evaluation are carried out using analytical methods of the theory of differential equations, methods of similarity theory and dimensions, as well as numerical methods for solving boundary value problems.RESULTS. The formulation of the problem of condensation of vapor containing solid particles on the edge is formulated. The presence of a self-similar solution is revealed, which is represented as a dimensionless function of one variable, uniform for all sets of initial parameters. The relations describing the distributions of the thickness δ(x, τ) of the sediment and the temperature ϑ(x, τ) on a straight edge of unlimited height (l = ∞) with an initially clean surface (h0 = 0) are obtained. These relations also almost accurately describe the initial stage of such a process on a straight edge of a finite height l, until a sediment of noticeable thickness covers the entire surface of the rib, as well as the initial moments in the case of an edge on a round pipe, until the width of the sediment zone with a noticeable thickness is significantly less than the radius of the pipe.CONCLUSION. Using these distributions as the initial ones for edges of limited height instead of, for example, introducing a uniform initial layer h0, will allow achieving high accuracy of numerical calculations without excessive thickening of the grid in coordinate and time.

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Section: результаты и обсуждениеunclassified

Section: Introductionunclassified

Features of solving the problem of condensation of vapor containing solid particles on the edge

Yakimov

Дмитриев

Badretdinova

et al. 2022

«Izvestiya vysshikh uchebnykh zavedenii. PROBLEMY ENERGETIKI»

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“…Simulation of the real depth of the fouling layer and its effects on the hydrodynamic of the flow Abarham et al [73] • Thermophoresis The models proposed by Xu et al [68] and Nagendra et al [69] use this technique in order to compute the submicron particle deposition inside plate-and-fin heat exchangers. They evaluated the particle deposition under different boundary conditions and validated their results, achieving a good agreement with the experimental measurements taken from literature.…”

Section: Good Agreement Observedmentioning

confidence: 99%

Numerical Modelling of Fouling Process in EGR System: A Review

Paz¹,

Suárez²,

Vence³

et al. 2021

Environmental Issues and Sustainable Development

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In order to combat climate change, the new rigorous standards for pollutant reduction have shone a light on the use of exhaust gas recirculation system in order to minimize the NOx emissions of vehicles. For this reason, the fouling problem that appears on the exhaust gas recirculation line, caused by the deposition of soot particles and hydrocarbons that are part of the exhaust gas, has become particularly relevant in the last few years. In this field, researches have proposed numerical models in order to estimate and predict the deposit formation and growth. Using various numerical techniques, they intend to determine and reproduce the fouling layer buildup considering the different mechanisms that are involved in the deposit formation. This chapter provides a detailed and comprehensive account of the numerical approaches that have been proposed to analyze the fouling phenomenon that occurs inside the exhaust gas system. The main characteristics of each numerical model, as well as their main strengths and weaknesses, are exposed and evaluated, and their simulation capabilities are examined in detail.

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“…They also found that the type of fouling and severity can vary depending on engine operating conditions and the type of fuel used. Xu et al [8] experimentally investigated the performance of a compact heat exchanger used as an EGR cooler in a diesel engine. The authors found that the heat exchanger design significantly affected the cooling performance and pressure drop of the EGR cooler.…”

Section: Introductionmentioning

confidence: 99%

CFD Analysis of Flow Behavior and Thermal Performance in Single and Multi-Inlet EGR Coolers

Agarwal¹,

Batista²

2023

IJHT

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In heavy-duty vehicles, Exhaust Gas Recirculation (EGR) coolers have been used since 2002 to reduce NOx emissions by recirculating exhaust gases. EGR systems increase fuel efficiency and achieve more thorough combustion, while the EGR cooler, which cools the exhaust gases, is crucial to protect the engine by lowering the combustion temperature. This research evaluates the flow behavior and thermal characteristics of EGR coolers using the k-omega turbulence model. The study compares the effectiveness of two designs of EGR coolers: the single coolant inlet type and the four-inlet type configuration. The CAD design of the EGR cooler is developed in Creo design software, and CFD simulations are conducted using the ANSYS CFX simulation package. The results show that the incorporation of additional coolant inlet tubes improves the EGR cooler's performance. The four-inlet design exhibits higher effectiveness compared to the single-inlet design at every operating temperature. The effectiveness is maximum at an operating temperature of 691K, and the four-inlet design shows 0.02 higher effectiveness than the single-inlet design at an operating temperature of 1058K. The conventional design of the EGR cooler with a single coolant inlet can be substituted with the new proposed design of the EGR cooler with four coolant inlets. The new proposed design of the EGR cooler has higher effectiveness and would enable the reduction of NOx emissions and improve engine efficiency.

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Simulation of particle deposition in a plate-fin heat exchanger using a particle deposition model with a random function method

Cited by 20 publications

References 41 publications

Features of solving the problem of condensation of vapor containing solid particles on the edge

Features of solving the problem of condensation of vapor containing solid particles on the edge

Numerical Modelling of Fouling Process in EGR System: A Review

CFD Analysis of Flow Behavior and Thermal Performance in Single and Multi-Inlet EGR Coolers

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