Heat transfer and fluid flow in a plate heat exchanger. Part II: Assessment of laminar and two-equation turbulent models

Gherasim, Iulian; Galanis, Nicolas; Nguyen, Cong Tam

doi:10.1016/j.ijthermalsci.2011.03.017

Cited by 62 publications

(36 citation statements)

References 11 publications

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“…Novosád et al in work [5] also investigated influence of different mesh sizes and quality. Results were again similar to that made by Gherasim [1].…”

Section: Introductionsupporting

confidence: 89%

“…Tsai [2], Liu [3] dealt with these heat exchangers with different geometries. The conclusions about temperature and pressure drop were similar to Gherasim [1]. Novosád in work [4] investigated the influence of oblique waves on the heat transfer surface.…”

Section: Introductionsupporting

confidence: 65%

“…E.g. Gherasim et al in work [1] presented the comparison of various grids for plate heat exchanger modelled by tetrahedral mesh. In order to assess the influence of the grid resolution on the solution, five grids were created and tested by meshing the volumes with different interval sizes.…”

Section: Introductionmentioning

confidence: 99%

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Advanced Methods of Modelling and Design of Plate Heat Exchangers

Dvořák¹

2017

dteees

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Abstract. Research of devices for heat recovery is currently focused on increasing the heat effectiveness of plate heat exchangers. The goal of optimization is not only to increase the heat transfer but also reduce the pressure loss and material costs. During the optimization of plate heat exchangers using CFD, we are struggling with the problem of how to create a quality computational mesh inside complex and irregular channels. These channels are formed by combining individual plates or blades that are shaped by molding, vacuum forming, or similar technology. Creating computational mesh from the bottom up manually is time consuming and does not help later optimization. The paper presents a new method for creating of computational meshes to simulate flow and heat transfer in a plate heat exchanger. This method is based on dynamic mesh method "user defined deforming" provided by ANSYS Fluent. The method is fast and provide applicable tool for optimization. Influences of cell size and count of layers of computational cells on heat transfer and pressure drop were investigated. It was found that the minimum number of layers is twelve across the channel, otherwise obtained data can be irrelevant. IntroductionHeat exchangers belong to the main parts of each energy and thermal devices and systems. The main purpose of each heat exchanger is to transport heat energy from one warmer medium, such as gas, liquid or steam, into other colder medium. In recuperative heat exchangers, both media are separated by walls and the heat energy must transfer also through this material.The phenomena in heat exchanger are very complicated and include not only heat conduction in material, which separates both mediums, but also flow of both mediums and heat transfer from medium into material walls. The development of recuperative heat exchangers in recent years focused on increasing effectiveness, but others requirements must be fulfilled too. We will focus mainly on plate heat exchangers, in which both mediums are separated by plates, in this study.

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“…Novosád et al in work [5] also investigated influence of different mesh sizes and quality. Results were again similar to that made by Gherasim [1].…”

Section: Introductionsupporting

confidence: 89%

Section: Introductionsupporting

confidence: 65%

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Advanced Methods of Modelling and Design of Plate Heat Exchangers

Dvořák¹

2017

dteees

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“…Most of researchers use unstructured meshes for their calculations. Gherasim et al, in work [2], presented a comparison of various grids for a plate heat exchanger modeled by a tetrahedral mesh.…”

Section: Introductionmentioning

confidence: 99%

Optimization of wave pattern of corrugation on plates of heat exchanger

Dvořák

2017

MATEC Web Conf.

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Abstract. The article deals with optimization of undulated heat transfer surface of plate heat exchanger. The goal of optimization is not only to increase effectiveness of heat transfer but also to reduce the pressure drop. Using four optimization parameters, the function describing the shape of corrugations is defined and these parameters are optimized. A simple steepest descent gradient method and stochastic Monte Carlo method are used, the optimum shape of the heat exchange surface is searched for four values of the pressure drop. It was found that a simple steepest descent method quickly gets stuck in a local extreme and the resulting configurations were found only by changing the slope of the waves. The stochastic method enables full optimization through the optimization space and find completely different waveforms with similar values of target function. The question, which shape of the waves on the heat transfer surface is the best, is still open.

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“…Gherasim et al, in work [2], presented a comparison of various grids for a plate heat exchanger modelled by a tetrahedral mesh. In order to assess the influence of the grid resolution on the solution, five grids were created and tested by meshing the volumes with different interval sizes.…”

Section: Introductionmentioning

confidence: 99%

Development of optimization method for plate heat exchanger with undulation

Dvořák

2016

MATEC Web Conf.

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Abstract. The article deals with optimization of undulated heat transfer surface of plate heat exchanger. The goal of optimization is not only to increase effectiveness of heat transfer but also to reduce the pressure drop. A combined pattern of undulation which combines herringbone pattern and wavy pattern was optimized and best values of four parameters were found; angle of herringbone pattern, number, phase and amplitude of longitudinal waves of wavy pattern. The optimization procedure looked for maximum of objective function which was a linear combination of effectiveness and pressure drop. We used simple Monte Carlo method and the optimum was searched for four values of reference pressure drop. Four different optimization were run and we investigated the effect of various definition of objective function and parameters of undulation. It was found that during optimization of combined pattern, the herringbone pattern is more favoured than wavy pattern. It is caused by the fact that herringbone pattern was described by the only one free parameter, which was the angle of undulation, and therefore it is more likely to be found by a stochastic method. This assumption was confirmed when simple wavy pattern was optimized and higher values of objective function and effectiveness were found.

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Heat transfer and fluid flow in a plate heat exchanger. Part II: Assessment of laminar and two-equation turbulent models

Cited by 62 publications

References 11 publications

Advanced Methods of Modelling and Design of Plate Heat Exchangers

Advanced Methods of Modelling and Design of Plate Heat Exchangers

Optimization of wave pattern of corrugation on plates of heat exchanger

Development of optimization method for plate heat exchanger with undulation

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