Influence of Perforated Fin on Flow Characteristics and Thermal Performance in Spiral Finned-Tube Heat Exchanger

Lee, Hyung Ju; Ryu, Jaiyoung; Lee, Seong Hyuk

doi:10.3390/en12030556

Cited by 24 publications

(11 citation statements)

References 27 publications

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“…The plates of the heat transfer surface are made of stainless steel, and its thermal properties are listed in Table 1. Practically, the plate heat exchanger is designed with some of the key parameters such as Colburn j-factor and Darcy friction factor in characterizing heat transfer and pressure drop [24]. These two factors are defined as…”

Section: Mathematical Representationsmentioning

confidence: 99%

Effect of Secondary Vortex Flow Near Contact Point on Thermal Performance in the Plate Heat Exchanger with Different Corrugation Profiles

Lee

2020

Energies

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The present study numerically investigates thermal performance and turbulent flow characteristics of chevron-type plate heat exchangers with sinusoidal, trapezoidal, triangular, and elliptical corrugation profiles. The commercial code of ANSYS Fluent (v. 17.0) is used for computational fluid dynamics (CFD) simulation with the realizable k-ε model. In particular, we focus on the influence of configuration shape on a substantial change in flow direction near the contact point, yielding local vorticity. As a result, secondary vortical motions are observed in the flow passage with vorticity that is distributed locally and which changes near the contact point. Higher flow mixing generated and distributed by the secondary vortical motions contributes to the increase of the Colburn j-factor as well as the friction factor. The highest Colburn j-factor and friction factor are obtained for an elliptical profile, compared to other shapes, because of the increase in the vortex strength near the contact point.

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Section: Mathematical Representationsmentioning

confidence: 99%

Effect of Secondary Vortex Flow Near Contact Point on Thermal Performance in the Plate Heat Exchanger with Different Corrugation Profiles

Lee

2020

Energies

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“…Application of the regression analysis additionally allows evaluating the unknown parameters of the following analytical dependence for determining the hydraulic losses [28,29]: This dependence is an identical modification of the Darcy-Weisbach equation [30], widely used for solving the applied problems in the field of hydroaeromechanics.…”

Section: Hydraulic Lossesmentioning

confidence: 99%

“…Application of the regression analysis additionally allows evaluating the unknown parameters of the following analytical dependence for determining the hydraulic losses [28,29]:…”

Section: Hydraulic Lossesmentioning

confidence: 99%

Solving the Coupled Aerodynamic and Thermal Problem for Modeling the Air Distribution Devices with Perforated Plates

et al. 2019

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The article is focused on the comprehensive analysis of the aerodynamics of air distribution devices with the combined heat and mass exchange, with the aim to improve the following hydro- and thermodynamic parameters of ventilation systems: flow rate, air velocity, hydraulic losses, and temperature. The inadequacy of the previously obtained characteristics has confirmed the need for more rational designs of air distribution systems. Consequently, the use of perforated plates was proposed to increase hydraulic losses for reducing the average velocity and ensuring a uniform distribution of the velocity field on the outlet of the device. The effectiveness of one of the five possible designs usage is confirmed by the results of numerical simulation. The coefficient of hydraulic losses decreased by 2.5–3.0 times, as well as the uniformity of the outlet velocity field for the air flow being provided. Based on the three-factor factorial experiment, the linear mathematical model was obtained for determining the dependence of the average velocity on the flow rate, plate’s area, and diameter of holes. This model was significantly improved using the multiparameter quasi-linear regression analysis. As a result, the nonlinear mathematical models were obtained, allowing the analytical determination of the hydraulic losses and average velocity of the air flow. Additionally, the dependencies for determining the relative error of measuring the average velocity were obtained.

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“…The differential equations governing the turbulent flow that describe the chaotic movement of the fluid inside heat exchanger can be written in the tensor form according to Equations (5)- (12). The Continuity balance expresses the net mass flow at the scale of the infinitesimal control volume as follows in Equation 5:…”

Section: Numerical Computationmentioning

confidence: 99%

“…Sharifi et al [11] presented the influence of coiled wire inserts on the Nusselt number, friction coefficient and overall efficiency in double-pipe heat exchangers using CFD software for their analysis, in which significant improvements are described with regard to the heat exchanger containing coiled wire inserts with pitch length equal to 69 mm, the Nusselt number was enhanced by 1.77 times as compared with the plain heat exchanger. Numerical investigation and fluid flow characteristics of spiral finned-tube heat exchangers considering the effects of location of perforations and RNG k − ε model was carried out by [12].…”

Section: Introductionmentioning

confidence: 99%

Computational Model to Evaluate the Effect of Passive Techniques in Tube-In-Tube Helical Heat Exchanger

et al. 2019

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The purpose of this research is to evaluate the effect of twist in the internal tube in a tube-in-tube helical heat exchanger keeping constant one type of ridges. To meet this goal, a Computational Fluid Dynamic (CFD) model was carried out. The effects of the fluid flow rate on the heat transfer were studied in the internal and annular flow. A commercial CFD package was used to predict the flow and thermal development in a tube-in-tube helical heat exchanger. The simulations were carried out in counter-flow mode operation with hot fluid in the internal tube side and cold fluids in the annular flow. The internal tube was modified with a double passive technique to provide high turbulence in the outer region. The numerical results agree with the reported data, the use of only one passive technique in the internal tube increases the heat transfer up to 28.8% compared to smooth tube.

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Influence of Perforated Fin on Flow Characteristics and Thermal Performance in Spiral Finned-Tube Heat Exchanger

Cited by 24 publications

References 27 publications

Effect of Secondary Vortex Flow Near Contact Point on Thermal Performance in the Plate Heat Exchanger with Different Corrugation Profiles

Effect of Secondary Vortex Flow Near Contact Point on Thermal Performance in the Plate Heat Exchanger with Different Corrugation Profiles

Solving the Coupled Aerodynamic and Thermal Problem for Modeling the Air Distribution Devices with Perforated Plates

Computational Model to Evaluate the Effect of Passive Techniques in Tube-In-Tube Helical Heat Exchanger

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