Numerical analysis of the surface and geometry of plate fin heat exchangers for increasing heat transfer rate

Shahdad, Iman; Fazelpour, Farivar

doi:10.1007/s40095-018-0270-z

Cited by 12 publications

(12 citation statements)

References 27 publications

(34 reference statements)

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“…Energies 2020, 13 In this section, stresses are calculated in the vertical direction for the plain fin brazed seam. Global stresses for the complete PFHE assembly are shown below in Figure 10.…”

Section: Stressmentioning

confidence: 99%

“…They concluded that, under the same operating and geometrical conditions, the CVGPF channel showed the best thermal-hydraulic performance [12]. In another study, plain and perforated fins were analyzed, and it was concluded that, in perforated fins, increased heat transfer was observed with an overall pressure drop as compared to plain fin [13]. Recently, Peng et al [14] investigated the inlet design to PFHE on the basis of improved heat transfer; however, its effect on structure stability was not considered.…”

Section: Introductionmentioning

confidence: 97%

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Improved Analysis on the Fin Reliability of a Plate Fin Heat Exchanger for Usage in LNG Applications

et al. 2020

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A plate fin heat exchanger (PFHE) is a critical part of the cryogenic industry. A plate fin heat exchanger has many applications, but it is commonly used in the liquefied natural gas (LNG) industry for the gasification/liquefaction process. During this gasification to the liquefaction process, there is a large temperature gradient. Due to this large temperature gradient, stresses are produced that directly influence the braze joint of PFHE. Significant work has been carried out on heat transfer and the flow enhancement of PFHE; however, little attention has been paid to structural stability and stresses produced in these brazed joints. Due to these stresses, leakages in PFHE are observed, mostly in braze joints. In the current study, standard fin design is analyzed. In addition, the structural stability of brazed joints under standard conditions is also tested. Two techniques are used here to analyze fins, using the finite element method (FEM), first by examining the whole fin brazed joint on the basis of experimentally calculated yield strength and second by dividing the braze seam into three sections and defining individual strength for each section of the seam to find stress magnitude on the basis of heat-affected zones. Moreover, by using two different techniques to analyze brazed joints, the stresses in the lower face of the brazed joint were increased by 13% and decreased by 18% in the upper face using different zone techniques as compared to standard full braze seam analysis. It can be concluded that different zone techniques are better in predicting stresses as compared to simple full braze seam analysis using the finite element method since stresses along the lower face are more critical.

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Section: Stressmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

Improved Analysis on the Fin Reliability of a Plate Fin Heat Exchanger for Usage in LNG Applications

et al. 2020

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“…The results indicated that the elliptical tube showed better thermal performance and a 30%-40% increase in pressure drop than that of circular tubes. Shahdad et al [23] carried out studies on the heat transfer rate of plain and perforated plate-fin heat exchangers. It was revealed that perforated plate-fin has a higher heat transfer coefficient and Nusselt number than plain fin.…”

Section: Introductionmentioning

confidence: 99%

Thermal and Fluid Flow Analysis of Shell-and-Tube Heat Exchangers with Smooth and Dimpled Tubes

Fetuga¹,

Olakoyejo²,

Shote³

et al. 2022

J. ADV. ENG. COMPUT.

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This current work mainly focuses on the enhancement of the heat transfer and fluid flow characteristics of shell-and-tube heat exchangers by incorporating dimples on the smooth or conventional tubes. With the aid of the ANSYS (Fluent) commercial software package, Computational Fluid Dynamics (CFD) simulations under a steady-state condition were conducted on heat exchanger having a single shell and 12 tubes (with or without dimples), 50% baffle cut, 100mm baffle spacing and turbulent flow. The temperature, velocity, and pressure fields at the shell and tube zone in both cases are analyzed. The computational fluid dynamics results of the heat exchanger with dimpled tubes are compared with conventional (smooth) tubes. However, the results show that a shell and tube heat exchanger with dimpled tubes has a higher overall heat transfer coefficient than that of conventional (smooth) tubes. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium provided the original work is properly cited.

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“…Heat transfer rates, heat transfer performances, pressure drops, and system performances of different perforated fins were compared with solid fins of various geometries. Shahdad and Fazelpour 26 investigated the flow field and turbulent flow heat transfer around an array of plain and perforated fin using Fluent software within the range of 20,000–50,000 Reynolds. Regarding the turbulent flow, the k - ε RNG turbulence model was implemented, and the SIMPLE algorithm was used for solving the equations of three-dimensional, steady, and incompressible flow.…”

Section: Introductionmentioning

confidence: 99%

Numerical study of heat transfer of laminar air flow in perforated trapezoidal corrugated plate-fin ducts

Piradl

Pesteei

2021

Proceedings of the Institution of Mechanical Engineers, Part C:

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A novel trapezoidal corrugated perforated fin core is proposed in this study. The porosity of the fin surface, or perforations, is indicated to promote the unusual behavior of increasing the heat transfer coefficient, while reducing the friction factor with respect to its non-perforated counterpart, primarily due to surface transpiration, which leads to better flow mixing and successive boundary layer disturbances. This allows the heat exchanger to be built much more compact with a smaller volume and a front area. To highlight this, the results of the computational simulations for velocity and temperature fields in typical trapezoidal corrugated perforated plate-fin ducts are presented. Constant property, fully or periodically developed laminar airflow [Formula: see text] with Reynolds number [Formula: see text] passing through inter-fin passages, with fins at constant wall temperature T, in which the fin walls have perforations equally spaced along the length of the duct, is considered and a parametric study of the effects of the duct geometry, including the variation of the inclination angle [Formula: see text] of the diverging plane, the aspect ratio of the channel or period length and fin density effects [Formula: see text] and the converging-diverging ratio of the plate [Formula: see text], is performed. The results of the Fanning friction factor and the Nusselt number over the wide range of the Reynolds number, which was treated in this study, show the improved performance. The improvement is assessed quantitatively by the area goodness factor ( j/ f) relative to Re, comparison with simple flat channels. It is seen that increasing ϕ to [Formula: see text] improves the core performance; As ϕ increases beyond [Formula: see text], performance starts to decrease. j/ f increases with increasing λ; and λ = 3.6 acts as an inflection point. It is better to have a large λ value for lower Re range and vice versa. As ε increases, the performance increases; so, the highest area goodness factor value occurs at [Formula: see text]. In case 11, with [Formula: see text], [Formula: see text], and [Formula: see text] at Re = 200, compared to the non-perforated channel, the friction factor decreases about 11%, and the area goodness factor increases about 72%. Thus, the area goodness factor of the perforated case reaches 0.37.

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Numerical analysis of the surface and geometry of plate fin heat exchangers for increasing heat transfer rate

Cited by 12 publications

References 27 publications

Improved Analysis on the Fin Reliability of a Plate Fin Heat Exchanger for Usage in LNG Applications

Improved Analysis on the Fin Reliability of a Plate Fin Heat Exchanger for Usage in LNG Applications

Thermal and Fluid Flow Analysis of Shell-and-Tube Heat Exchangers with Smooth and Dimpled Tubes

Numerical study of heat transfer of laminar air flow in perforated trapezoidal corrugated plate-fin ducts

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