Thermal performance of plate-fin heat exchanger using passive techniques: vortex-generator and nanofluid

Khoshvaght-Aliabadi, M.

doi:10.1007/s00231-015-1603-6

Cited by 23 publications

(6 citation statements)

References 36 publications

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“…The computations were performed at a laminar Reynolds Re = 600, 800, 1000,1200 and 1400, which displays that the percentage of Pressure Loss increases as the REs increase which was agreed with previous studies [2,7]. The results show that Pressure Loss reaches its peak values for the Renumber = 1400 by 44.69 % of RWP LVG higher than the ORT fin without using the VG.…”

Section: Pressure Losssupporting

confidence: 89%

Improvement of Plate-Fin Heat Exchanger Performance with Assistance of Various Types of Vortex Generator

Abbas

Mohammed

2023

CFDL

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A 3-dimensional incompressible laminar flow and heat-transfer in a plate-fin heat exchanger (PFHE) where investigated numerically in this article. The influence of mounting a longitudinal vortex generator (LVG) on the offset rectangular-triangular fin (ORT) in the PFHE, on thermal and hydro-dynamic fields are presented. The novelty of this study is by attaching a LVG to an offset strip fin (OSF) surface. The cases of study for the PFHE are established, by using a built-in rectangular winglet pair type RWP longitudinal vortex generator carried out and fitted on this fin to improve the convective heat transfer of the (ORT) fin while minimizing pressure loss. The upper and lower plates are exposed to constant heat flux and the working fluid is air where chosen under a laminar range of RE (600 to 1400). The laminar flow and heat-transfer are governed by continuity, momentum and energy equations. ANSYS FLUENT (2021 R1) is used to get the numerical results, based on the finite volume method. The performance of the VG is assessed for an optimum winglet attack angle (45°), as well as by modifying the geometrical size parameters, namely the height and placement (L) of the RWP LVG. The result shows that the Nusselt number reaches its optimum enhancement values by using a common flow up CFU built-in rectangular winglet pair type RWP VG with a height and entrance length of (h=1.25mm, L=0.5mm), by 22.23% as compared with base case configuration (ORT). Finally, a two more LVG are tested with the optimum conditions of the RWP, which they are a delta winglet pair (DWP) and trapezoidal winglet pair (TWP). In addition, the temperature fields for the primary and secondary flows were shown in contour and streamline diagrams

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Section: Pressure Losssupporting

confidence: 89%

Improvement of Plate-Fin Heat Exchanger Performance with Assistance of Various Types of Vortex Generator

Abbas

Mohammed

2023

CFDL

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“…Aiming to enhance the efficiency of a PFHE, Khoshvaght‐Aliabadi 73 equipped a channel with vortex generators (VGs) and Cu/water nanofluid. Their experimental results illustrated the superiority of VG over the use of nanofluid in terms of thermal enhancement.…”

Section: Nanofluid Transport Under the Transitional Flow Regimementioning

confidence: 99%

“…For PFHEs, Khoshvaght‐Aliabadi 73 combined two heat transfer enhancement techniques, namely: VGs and Cu/water nanofluids under different volume fractions. The maximum thermal enhancement factor that was obtained by using both techniques was about 1.67.…”

Section: Nanofluid Transport Under Turbulent Flow Regimementioning

confidence: 99%

Advances of nanofluids in heat exchangers—A review

Menni

Chamkha

Ameur³

2020

Heat Trans

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Recently, many researchers have focused on their studies on the analysis of nanofluid flows due to their participation in the enhancement of heat transfer rates in industrial processes. The ordinary fluids, such as water, mineral oils, and so on, are known for their low thermal conductivity in heat transfer processes. A significant enhancement in the thermal properties of ordinary fluid may be obtained by adding nanoparticles having a diameter of less than 100 nm or suspension of fibers. Better spreading, wetting, dispersion, and stability and with acceptable viscosity are the main advantageous properties of nanofluids on a solid surface. The nanofluids are encountered in various thermal engineering systems such as in heat exchangers, refrigeration, thermal management of fuel cells, cooling of nuclear reactors, microelectromechanical systems, and others. In particular, the thermal conversion is known as a great application of nanotechnology, and many studies have been achieved with such fluids in heat exchangers. Therefore, this paper aims to present a global insight into the different applications of nanofluids in various heat exchangers, that is, heat pipe and plate-fin heat exchangers. All research works have been summarized into three main parts: laminar, transition, and turbulent nanofluid flow regimes.

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“…Moreover, combining the nanofluids with other passive techniques leads to having higher In another experimental study, the thermal-hydraulic performance of Cu-water nanofluid in a range of solid concentrations (0.1 to 0.4 wt. %) in a plain channel and vortex-generator channel (Figure 20) in a plate-fin HE were investigated by Aliabadi [207]. Based on the results, increasing the solid concentration leads to increasing the thermal-hydraulic performance of the plain channel plate-fin HE (Figure 21a).…”

Section: Plate-fin Heat Exchangersmentioning

confidence: 99%

On the Role of Nanofluids in Thermal-hydraulic Performance of Heat Exchangers—A Review

et al. 2020

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Heat exchangers are key components in many of the devices seen in our everyday life. They are employed in many applications such as land vehicles, power plants, marine gas turbines, oil refineries, air-conditioning, and domestic water heating. Their operating mechanism depends on providing a flow of thermal energy between two or more mediums of different temperatures. The thermo-economics considerations of such devices have set the need for developing this equipment further, which is very challenging when taking into account the complexity of the operational conditions and expansion limitation of the technology. For such reasons, this work provides a systematic review of the state-of-the-art heat exchanger technology and the progress towards using nanofluids for enhancing their thermal-hydraulic performance. Firstly, the general operational theory of heat exchangers is presented. Then, an in-depth focus on different types of heat exchangers, plate-frame and plate-fin heat exchangers, is presented. Moreover, an introduction to nanofluids developments, thermophysical properties, and their influence on the thermal-hydraulic performance of heat exchangers are also discussed. Thus, the primary purpose of this work is not only to describe the previously published literature, but also to emphasize the important role of nanofluids and how this category of advanced fluids can significantly increase the thermal efficiency of heat exchangers for possible future applications.

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Thermal performance of plate-fin heat exchanger using passive techniques: vortex-generator and nanofluid

Abstract: Transverse vortex spacing (m) ∆P Pressure drop (Pa) R Dependent variable R 2

Cited by 23 publications

References 36 publications

Improvement of Plate-Fin Heat Exchanger Performance with Assistance of Various Types of Vortex Generator

Improvement of Plate-Fin Heat Exchanger Performance with Assistance of Various Types of Vortex Generator

Advances of nanofluids in heat exchangers—A review

On the Role of Nanofluids in Thermal-hydraulic Performance of Heat Exchangers—A Review

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