A new correlation for predicting the hydrothermal characteristics over flat tube banks

Sahel, Djamel; Ameur, Houari; Boudaoud, Warda

doi:10.30464/jmee.2019.3.3.273

Cited by 10 publications

(3 citation statements)

References 29 publications

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“…Djeffal et al [22] examined and compared oval and flat tube in a annular finned tube heat exchangers with conventional circular tube. Sahel et al [23] found a new correlation of hydrothermal characteristic over flat tube banks. They studied numerically and simulations were two dimension in laminar flow condition.…”

Section: Introductionmentioning

confidence: 95%

A numerical study for solid and serrated annular finned tube bundles

Taçgün

Aksoy

2022

THERM SCI

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Annular finned tube bundles are commonly used for heat recovery systems. Nowadays, heat recovery systems are important in the energy economy. Cross-flow heat exchangers, one of the heat exchanger types are suitable for waste heat recovery systems. Annular fins are utilized in cross-flow heat exchangers for a long time. In this study, two types of annular fin geometry, namely solid and serrated fins, were studied numerically in the cross-flow heat exchangers. All numerical analyses are performed in Ansys-Fluent program and the fin geometries are designed in three-dimensional geometry. Numerical results obtained for two different geometry fins are validated separately with the literature. It is seen that analysis results are found to be compatible with the literature. In numerical analyses, five different Reynolds Numbers and six different geometric parameters are studied. Effects of these parameters are investigated to determine the flow and thermal performance. According to analysis results, the thermal performance of the serrated annular fin geometry is about 8.2 % higher than the solid fin geometry, while the flow performance decreases by 7.5%.

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Section: Introductionmentioning

confidence: 95%

A numerical study for solid and serrated annular finned tube bundles

Taçgün

Aksoy

2022

THERM SCI

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“…Swirling motion can be induced within heat exchangers by incorporating modifications in either the tube 8 or duct configuration using various elements such as ridges, 9 diverters, 10 fins, 11 vanes, 12 baffles 13 perforated 14 or graded 15 and VG non‐punched 16,17 and punched 18 …”

Section: Introductionmentioning

confidence: 99%

Thermal hydraulic performance of a tubular heat exchanger with in‐line perforated baffle with shutter type saw tooth turbulator

Rahman

2024

Heat Trans

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This experimental investigation aimed to analyze the impact of a unique design of swirl generator airflow on the performance of a tubular heat exchanger operating with axial flow. To conduct the experiment, we utilized a custom‐built apparatus containing eight sawtooth air deflectors with differing space height ratios (e/h). These deflectors were oriented in a uniform manner (shutter type) and positioned at various inclination angles. Circular baffle plates, housing these deflectors, were equidistantly spaced at different pitch ratios. The arrangement of tubes within the heat exchanger remained constant throughout the study, while the Reynolds number ranged from 16,000 to 30,000. In addition, a consistent heat flux condition was maintained on the surface of the tubes. The research outcomes indicated that incorporating a deflector baffle plate with an inclination angle of 30°, an e/h ratio of 0.4, and a pitch ratio of 1.2 led to an average increase of 1.36 in the thermal enhancement factor when compared to a heat exchanger lacking a baffle plate, tested under similar conditions.

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“…The overall heat transfer coefficient for both laminar and turbulent flows increases as the number of pairs of VGs increased, based on the number of rows difference (Syaiful et al, 2017). The geometry of the tube banks impacts the thermo-hydraulic characteristics of a fin and tube heat exchanger (FTHE) directly (Sahel, Ameur, and Mellal, 2020) and a reduction in the heat convection coefficient as the flat tube's size increases (Sahel, Ameur, and Boudaoud, 2019). A study by Susanto et al (2020) showed that the heat transfer rate improves more smoothly; where the influence of convection walls is minimal, the local Nusselt number (Nu) grows and the velocity profile increased marginally.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation for Single-Phase and Two-Phase Flow in Duct Banks with Multi Types of Vortex Generators

Ibrahim¹,

Al-Turaihi²

2023

IJTech

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This paper examines the numerical work of the thermal convection over tube banks with winglets through the heat exchanger in two parts under turbulent conditions. The first section investigates the influence of two-phase (water and air) flow on the performance of two kinds of vortex generators (Delta and Rectangular) winglets across the oval tube banks. The second section studied the performance of four types of winglets (Delta, Rectangular, Zikzak, and Sinusoidal wavy), circular and oval tubes, forward and downward configurations, and various angles of attack (15°, 20°, and 25°) in two-phase flow. Delta winglets provide the highest performance at an attack angle of 15° for oval tube banks in a two-phase flow with a moderate turbulent flow rate.

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A new correlation for predicting the hydrothermal characteristics over flat tube banks

Cited by 10 publications

References 29 publications

A numerical study for solid and serrated annular finned tube bundles

A numerical study for solid and serrated annular finned tube bundles

Thermal hydraulic performance of a tubular heat exchanger with in‐line perforated baffle with shutter type saw tooth turbulator

Numerical Investigation for Single-Phase and Two-Phase Flow in Duct Banks with Multi Types of Vortex Generators

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