Experimental and numerical study on unsteady natural convection heat transfer in helically coiled tube heat exchangers

Neshat, Elaheh; Hossainpour, Siamak; Bahiraee, Farid

doi:10.1007/s00231-014-1299-z

Cited by 21 publications

(13 citation statements)

References 8 publications

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“…Neshat et al 20 investigated experimentally and numerically unsteady natural convection from outer surface of helical coils. Four helical coils with two different curvature ratios were used.…”

Section: Introductionmentioning

confidence: 99%

Numerical evaluation and the effects of geometrical and operational parameters on thermal performance of the shell and double coil tube heat exchanger

et al. 2020

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Heat exchangers are extensively used in various industries. In this study, the impact of geometric and flow parameters on the performance of a shell and double helical coil heat exchanger is studied numerically. The investigated geometric parameters include external coil pitch, internal coil pitch, internal coil diameter, and coil diameter. The influences of considered geometrical parameters are analyzed on the output temperature of the hot and cold fluid, convective heat transfer coefficient, pressure drop, and average Nusselt number. Water is considered as working fluid in both shell and tube. As an innovation, double helical coils are used instead of one in the heat exchanger. To compare the obtained results accurately, in each section, the heat transfer area (coil outer surface) is kept constant in all models. The results show that the geometrical parameters of double helical coils significantly affect the heat transfer rate.

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Section: Introductionmentioning

confidence: 99%

Numerical evaluation and the effects of geometrical and operational parameters on thermal performance of the shell and double coil tube heat exchanger

et al. 2020

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“…Furthermore, the recent remarkable progress in hardware and software engineering has made the numerical methods become a common practical tool by the means of computational fluid dynamics (CFD) approaches for further analysis of three-dimensional and transient flows in openchannels [3,[18][19][20][21][22]. For example, Blanckaert [18] numerically studied the velocity field and super-elevation in open-channel bends.…”

Section: Introductionmentioning

confidence: 99%

Application of computational intelligence methods for complex two-phase flow pattern recognition

Seyedashraf

Rezaei

Akhtari

2018

J Braz. Soc. Mech. Sci. Eng.

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Recognizing the significance of accurate predictions of flow conditions in open-channel bends is key in attempts to preserve riverbanks from erosion. The focus of the present work is on the application of two computational intelligence (CI) models to predict free surface flow pattern in a strongly curved 60°open-channel bend. An experimental study is also carried out to prepare the required input and output data set for the CI training and validation process. A set of 476 data is used to train and test the proposed models. The adaptive neuro-fuzzy inference system (ANFIS) and multilayer perceptron (MLP) networks are adopted to construct the models. The CI results are compared with the experimental data obtained. Excellent agreement is found representing the reliability of the employed models. The findings confirm that the models present accurate predictions of the flow depths and velocities, while the MLP network outperforms ANFIS with a mean relative error percentage of 0.67%. New equations are also proposed for estimating the super-elevation and flow of the study.

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“…Raju et al [15] and Lele et al [16] established the modelling of a helical coil heat exchanger with COMSOL software, respectively, and studied the heat transfer characteristics of the exchanger. In [17][18][19][20][21][22][23], the numerical simulations on coil heat exchangers were conducted and the optimizations of exchangers were explored.…”

Section: Introductionmentioning

confidence: 99%

Study of a Coil Heat Exchanger with an Ice Storage System

Yan

Yang

et al. 2017

Energies

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Abstract:In this study, a coil heat exchanger with an ice storage system is analyzed by theoretical analysis, numerical analysis, and experimental analysis. The dynamic characteristics of ice thickness variation is studied by means of unstable heat conduction theory in cylindrical coordinates, and the change rule of the ice layer thickness is obtained. The computational fluid dynamics method is employed to simulate the flow field and ice melting process of the coil heat exchanger. The effect of the agitator height on the flow characteristics and heat transfer characteristics is investigated. The numerical results show that the turbulence intensity of the fluid near the wall of the heat exchanger is the largest with an agitator height of 80 mm. Furthermore, the process of ice melting is analyzed. The ice on the outer side of the evaporator tube close to the container wall melts faster than the inner side and this agrees well with the experimental result. The experimental study on the process of the operational period and deicing of the coil heat exchanger is conducted and the temperature variation curves are obtained by the arrangement of thermocouples. It is found that the temperature of the evaporating tube increases with increasing height in the process of ice storage.

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Experimental and numerical study on unsteady natural convection heat transfer in helically coiled tube heat exchangers

Cited by 21 publications

References 8 publications

Numerical evaluation and the effects of geometrical and operational parameters on thermal performance of the shell and double coil tube heat exchanger

Numerical evaluation and the effects of geometrical and operational parameters on thermal performance of the shell and double coil tube heat exchanger

Application of computational intelligence methods for complex two-phase flow pattern recognition

Study of a Coil Heat Exchanger with an Ice Storage System

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