Heat transfer and flow characteristics in a sinusoidally curved converging-diverging channel

Kurtulmuş, Nazım; Zontul, Harun; Şahi̇n, Beşi̇r

doi:10.1016/j.ijthermalsci.2019.106163

Cited by 44 publications

(4 citation statements)

References 37 publications

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“…The same experimental set-up introduced by Kurtulmus et al [22] were used to perform the experiments to examine the flow pattern of the square-shaped cylinder. However, it is necessary to explain the details of the set up briefly.…”

Section: Experimental Set-upmentioning

confidence: 99%

Düz Kanal İçerisine Yerleştirilmiş Kare Şekilli Silindir Ardındaki Akış Yapısı

Kurtulmuş

2021

Çukurova Üniversitesi Mühendislik Fakültesi Dergisi

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Experiments were conducted to investigate the flow topology downstream of a square-shaped cylinder situated in a straight channel. The critical parameters such as the Reynolds number (Re = 500) and the blockage ratio of the square-shaped cylinder (25%) were determined in light of the literature. A Particle image velocimetry (PIV) system was used to obtain the instantaneous velocity vector map. The flow structures, including the time-mean vorticity distribution, <ω> instantaneous and time-mean streamline topology, Ψ, distributions of streamwise velocity fluctuations, urms, turbulent kinetic energy, TKE are presented with Figures.

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Section: Experimental Set-upmentioning

confidence: 99%

Düz Kanal İçerisine Yerleştirilmiş Kare Şekilli Silindir Ardındaki Akış Yapısı

Kurtulmuş

2021

Çukurova Üniversitesi Mühendislik Fakültesi Dergisi

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“…Islam et al [21] adopted function expansion and collocation method to seek out the USs for rotating curved rectangular duct (CRD) flow. Kurtulmus et al [22] observed the Nusselt number effect in flow transition for converging and diverging channel. Zheng et al [23] used k -ω turbulence model in a serpentine tube to obtain the temperature oscillation and the effects of centrifugal and buoyancy force in the flow transition.…”

Section: Introductionmentioning

confidence: 99%

Effects of Rotation on Unsteady Fluid Flow and Forced Convection in the Rotating Curved Square Duct With a Small Curvature

et al. 2022

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In recent years, the analysis of flow disposition in a curved duct (CD) has greatly attracted researchers because it is broadly used in engineering devices. In the present paper, unsteady flow characteristics of energy transfer (HT) in a rotating curved square duct (CSD) have been presented with the aid of spectral method. The key purpose of this study is to explore rotational effects and heat transfer (HT) of the duct. For this purpose, time-evolution calculation is performed over the Taylor number (-1500 ≤ Tr ≤ 1500) and other parameters are fixed; e.g., Dean number (Dn = 1000), Curvature (δ = 0.015) and Prandtl number (Pr = 7.0, for water). Firstly, time-dependent behavior is accomplished for both clockwise and anticlockwise rotations. It is found that the flow instabilities are certainly governed by the change of Tr that has been justified by sketching phase spaces (PS). To observe the flow features, velocities including axial flow (AF), secondary flow (SF) and temperature profiles are disclosed for both rotations; and it is elucidated that 2- to 6-vortex solutions are generated for physically realizable solutions. Axial flow (AF) shows that two maximum-velocity regimes are produced which induces secondary flow (SF), and, consequently, a strong bonding between the AF and SF has been built up. It is observed that as the rotation is increased, the fluid is mixed considerably which boosts HT in the fluid. Finally, an assessment between the numerical and experimental data has been given, and a good agreement is observed.

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“…They shifted the corrugations 0°, 90°, and 180°and concluded that fluid mixing in corrugated areas lead to heat transfer enhancement at the cost of a slight pressure loss. Kurtulmus x et al 32 studied sinusoidal corrugations in a channel for Re numbers from 4 3 10 3 to 1 3 10 4 experimentally and numerically. Their results showed that fluid acceleration occurs due to the contractions in the corrugated channel and results in local Nusselt number increase.…”

Section: Introductionmentioning

confidence: 99%

Heat transfer enhancement in channels with roughened and elastic walls

Ghazani

Razavi

Ranjbar

2023

Proceedings of the Institution of Mechanical Engineers, Part C:

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In this research, a combination of passive and active heat transfer enhancements are used synergistically to assist in the increase of absorbed heat from a channel by roughened and fluctuating walls. To this end, the upper wall is artificially roughened and a fluctuating segment is added to the lower wall. Flow regime is considered to be laminar and Reynolds number is 1000 at the entrance of the channel. Combinations of various roughness geometries and fluctuations are studied. It was found that due the increase of the fluid kinetic energy and its interaction with roughened surface and elastic segment, heat transfer rate is amplified. To investigate the overall efficiency of the system, Nusselt number and friction factor are calculated and a maximum value of 37.5% increase in average Nusselt number of the midsection where elastic wall is placed has been reached by flexible plate displacement. A maximum Nusselt number increase of 167% has been observed when the elastic plate reaches its peak value.

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Heat transfer and flow characteristics in a sinusoidally curved converging-diverging channel

Cited by 44 publications

References 37 publications

Düz Kanal İçerisine Yerleştirilmiş Kare Şekilli Silindir Ardındaki Akış Yapısı

Düz Kanal İçerisine Yerleştirilmiş Kare Şekilli Silindir Ardındaki Akış Yapısı

Effects of Rotation on Unsteady Fluid Flow and Forced Convection in the Rotating Curved Square Duct With a Small Curvature

Heat transfer enhancement in channels with roughened and elastic walls

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