Inducing swirl flow inside the pipes of flat-plate solar collector by using multiple nozzles for enhancing thermal performance

Cao, Yan; Ayed, Hamdi; Hashemian, Mehran; Issakhov, Alibek; Jarad, Fahd; Wae-hayee, Makatar

doi:10.1016/j.renene.2021.09.018

Cited by 38 publications

(3 citation statements)

References 30 publications

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“…[ 22,23 ] The SST k‐ω model, known for its computational efficiency, is selected for turbulence closure in this study due to its proficiency in simulating rapidly strained flows and accurately capturing swirl characteristics within complex swirling flow systems. [ 24,25 ] Two critical variables in this turbulent model, including turbulence kinetic energy ( k ) and eddy dissipation rate ( ω ), can be formulated as follows [ 26 ] :

\frac{\partial}{\partial t} ((), ρk) goodbreak+ \frac{\partial k}{\partial x_{j}} ((), italicρk u_{j}) goodbreak= P_{k} goodbreak- ρ β_{*} italickω goodbreak+ \frac{\partial}{\partial x_{j}} ([], \frac{\partial}{\partial x_{j}} ((), k ((), (μ + \frac{μ_{t}}{σ_{k}}))))

\frac{\partial}{\partial t} ((), ρω) goodbreak+ \frac{\partial}{\partial x_{j}} ((), italicρω u_{j}) goodbreak= α P_{ω} goodbreak- {ρβω}^{2} goodbreak+ \frac{\partial}{\partial x_{j}} ([], \frac{\partial}{\partial x_{j}} ((), ω ((), μ goodbreak+ \frac{μ_{t}}{σ_{ω}}))) goodbreak+ 2 ρ ((), 1 goodbreak- F_{1}) σ_{ω 2} \frac{1}{ω} \frac{\partial k}{\partial x_{i}} \frac{\partial ω}{\partial x_{j}}

…”

Section: Methodsmentioning

confidence: 99%

“…[22,23] The SST k-ω model, known for its computational efficiency, is selected for turbulence closure in this study due to its proficiency in simulating rapidly strained flows and accurately capturing swirl characteristics within complex swirling flow systems. [24,25] Two critical variables in this turbulent model, including turbulence kinetic energy (k) and eddy dissipation rate (ω), can be formulated as follows [26] :…”

Section: Methodsmentioning

confidence: 99%

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Insights into the hydrodynamics in the annular pipe of industrial‐scale top‐blown smelting furnace

Wan,

Yang,

Tang

et al. 2024

Can J Chem Eng

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The coaxial jet consisting of swirl jet and axial jet plays a critical role in the industrial processes but is rarely investigated; therefore, it is numerically explored by means of the computational fluid dynamics (CFD) approach in the present work. The force on the swirler, axial and tangential velocity at the annular pipe outlet, and the spatial distribution of swirl number (SN) are selected to evaluate the effect of geometrical parameters on the swirling performance. The results clarify that the velocity and their azimuthal components in the transverse cross‐section can be categorized into six segments based on high/low velocity values. The coaxial jets form a weak swirl with high axial, certain tangential, and low radial velocities. x‐ and y‐vorticity vary within −200 to 200 s−1. Coaxial jet mixing decays the SN. Based on the multi‐objective matrix analysis, swirler height has the largest effect on swirl performance followed by diameter, angle, and number based on analysis. Optimal parameters are 130° vane angle, 240 mm diameter, 10 vanes, and 250 mm height of the swirler.

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\frac{\partial}{\partial t} ((), ρk) goodbreak+ \frac{\partial k}{\partial x_{j}} ((), italicρk u_{j}) goodbreak= P_{k} goodbreak- ρ β_{*} italickω goodbreak+ \frac{\partial}{\partial x_{j}} ([], \frac{\partial}{\partial x_{j}} ((), k ((), (μ + \frac{μ_{t}}{σ_{k}}))))

\frac{\partial}{\partial t} ((), ρω) goodbreak+ \frac{\partial}{\partial x_{j}} ((), italicρω u_{j}) goodbreak= α P_{ω} goodbreak- {ρβω}^{2} goodbreak+ \frac{\partial}{\partial x_{j}} ([], \frac{\partial}{\partial x_{j}} ((), ω ((), μ goodbreak+ \frac{μ_{t}}{σ_{ω}}))) goodbreak+ 2 ρ ((), 1 goodbreak- F_{1}) σ_{ω 2} \frac{1}{ω} \frac{\partial k}{\partial x_{i}} \frac{\partial ω}{\partial x_{j}}

…”

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Insights into the hydrodynamics in the annular pipe of industrial‐scale top‐blown smelting furnace

Wan,

Yang,

Tang

et al. 2024

Can J Chem Eng

View full text Add to dashboard Cite

show abstract

“…Various experimental and numerical studies on the performance of flat plate solar collectors can be found in the literature [ 7 , 8 , 9 , 10 ]. Azad [ 11 ] conducted an experimental analysis, taking into consideration real operating conditions for the FPC, with different numbers of heat pipes in the two heat pipe solar collectors and varying the heat exchanger area.…”

Section: Introductionmentioning

confidence: 99%

Performance Comparison of Different Flat Plate Solar Collectors by Means of the Entropy Generation Rate Using Computational Fluid Dynamics

Ramírez-Minguela

Rangel-Hernández

Alfaro-Ayala

et al. 2023

Entropy

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In this work, a numerical analysis of three different flat plate solar collectors was conducted using their entropy generation rates. Specifically, the Computational Fluid Dynamics (CFD) technique was used to compare the detailed performance of conventional and zigzag tube geometries of flat plate solar collectors (FPCs) in terms of their entropy generation rates. The effects of fluid viscosity, heat transfer, and heat loss of the flat plate solar collectors were considered for the local and global entropy generation rate analyses. Variations on the inlet volumetric flow rate of the FPCs from 1.0 to 9.0 L/min were simulated under the average solar radiation for one year in the state of Guanajuato, Mexico. The results illustrate and discuss the temperatures, pressures, and global entropy generation rates for volumetric flow variations. The velocity, temperature, and pressure distributions and the maps of the local entropy generation rates inside the collectors are presented and analyzed for the case with a flow rate of 3.0 L/min. These results demonstrate that the zigzag geometries achieved higher outlet temperatures and greater entropy generation rates than the conventional geometry for all the volumetric flow rates considered.

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CFD investigation of flow hydrodynamics and optimization in an industrial‐scale annular lance with swirl flow

Wan,

Yang,

Tang

et al. 2024

Can J Chem Eng

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Swirling flow has been applied in various fields due to its ability to enhance mass, heat, and momentum transfer performance. However, the generation of swirling flow occurs at the price of augmenting the pressure drop, and enhancing the friction and shear intensity of the jet with respect to the reactor wall. In the present work, the impact of geometrical configurations of the swirler on the hydrodynamics of the fluid in an industrial‐scale annular lance is investigated via the computational fluid dynamics method, with the discussion of the friction coefficient of the lance walls. It shows that the axial flow injected from the central lance is transformed into a weak swirl flow upon the introduction of swirl flow generated in the casing pipe. Within the mixing region, the interaction between axial and swirl flows results in elevated turbulent kinetic energy. Notably, under varying geometrical configuration conditions, the pressure drop between the inlet of the central pipe and the outlet is maximized. Additionally, the highest friction factor appears at a height of 1.35 m along the middle shell, with a value of 96.67.

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Inducing swirl flow inside the pipes of flat-plate solar collector by using multiple nozzles for enhancing thermal performance

Cited by 38 publications

References 30 publications

Insights into the hydrodynamics in the annular pipe of industrial‐scale top‐blown smelting furnace

Insights into the hydrodynamics in the annular pipe of industrial‐scale top‐blown smelting furnace

Performance Comparison of Different Flat Plate Solar Collectors by Means of the Entropy Generation Rate Using Computational Fluid Dynamics

CFD investigation of flow hydrodynamics and optimization in an industrial‐scale annular lance with swirl flow

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