Study of intensification of the heat transfer in helically coiled tube heat exchangers via coiled wire inserts

Gholamalizadeh, Ehsan; Hosseini, Ebrahim; Babaei, Reza; Amiri, Ali; Saee, Ali Dehghan; Alimoradi, Ashkan

doi:10.1016/j.ijthermalsci.2019.03.029

Cited by 39 publications

(12 citation statements)

References 40 publications

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“…Employing coiled wires although improves the heat transfer coefficient in single-phase flow [4][5][6] and two-phase flow heat exchangers [7][8][9], as is reported by researchers previously, it is accompanied by a substantial pressure drop which has to be considered in designing such heat exchangers. In this regard, Akhavan-Behabadi et al [10] experimentally investigated the pressure drop rise of refrigerant R-134a as a consequence of installing springs during condensation inside a horizontally placed pipe.…”

Section: Introductionmentioning

confidence: 71%

Flow pattern maps, pressure drop and performance assessment of horizontal tubes with coiled wire inserts during condensation of R-600a

Moghaddam

Sarmadian

Shafaee

et al. 2020

International Journal of Heat and Mass Transfer

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Section: Introductionmentioning

confidence: 71%

Flow pattern maps, pressure drop and performance assessment of horizontal tubes with coiled wire inserts during condensation of R-600a

Moghaddam

Sarmadian

Shafaee

et al. 2020

International Journal of Heat and Mass Transfer

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“…As Fig. 3 shows [23], the structured grid is used to discretize the locally encrypted ellipse tubes in the model, and the unstructured grid is used in other regions which are relatively sparse. Several sets of grids are tested to select a reasonable grid number.…”

Section: Mesh and Its Independence Verificationmentioning

confidence: 99%

Numerical method and analysis of a tube indirect evaporative cooler

Zhou

et al. 2022

THERM SCI

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The tube indirect evaporative cooler is energy-saving and environmentally friendly, and its heat transfer mechanism still needs to be fully indicated, for which the numerical method is more suitable than the experiment. Because many numerical researches focusing on the tube indirect evaporative cooler are usually based on the simplified models, such as single tube model, single side model, one-dimensional and two-dimensional model, the further improvement is still needed. Meanwhile, the tube indirect evaporative cooler is always expected to supply more cooling air with lower temperature at lower cost of energy, but many present studies are focusing on the improvement of heat transfer only and ignoring the energy cost. This paper proposed a three-dimensional full-scale numerical model and method verified by the experimental data, by which, the energy output (primary air-cooling capacity) and quality (temperature of primary air outlet) at the resistance loss(resistance) of the tube indirect evaporative cooler are analyzed with the help of Fluent software.

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“…For example, movement of animals [1], stalagmites development [2], dropping of hailstones [3], the surveillance of atmospheric pollutions [7], suspected movement of the drills in the petroleum engineering [8], gesticulation over bridges, chimney stacks and the towers in the field of civil sciences [9], the motion of airplanes in aerospace [10], the rods full of nuclear fuel in atomic engineering [5], cooling process of the batteries with power in the field of energy [11], developments of the heat exchangers [12], etc. Understanding the convection and fluid's behavior through the object especially on the curved shape is the main thing observed widely in so many industrial and engineering applications for generation of energy, thermal processing of apparatus as heat exchanger [13][14][15][16], and in the field of magneto-aerodynamics [17][18]. Several numerical techniques and tools have been used to understand the behavior of the fluid and to optimize and control the thermal distribution on the facing surface of the circular cylinder using some estimated parameters.…”

Section: Introduction and Literature Reviewmentioning

confidence: 99%

Analysis of Power Law Fluids and the Heat Distribution on a Facing Surface of a Circular Cylinder Embedded in Rectangular Channel Fixed With Screen: A Finite Element’s Analysis

et al. 2021

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The current article is an understanding of heat transfer and non-Newtonian fluid flow with implications of the power-law fluid on a facing surface of the circular cylinder embedded at the end of the channel containing the screen. The cylinder is fixed with an aspect ratio of 4:1 from height to the radius of the cylinder. The simulation for the fluid flow and heat transfer was obtained with variation of the angle of screen 63    , Reynolds number 1000 Re 10,000  and the power-law index 0.7 1.3 n  by solving the two-dimensional incompressible Navier-Stokes equations and the energy equation with screen boundary condition and slip walls. The results will be in a good match with asymptotic solution given in the literature. The results are presented through graph plots for the non-dimensional velocity, temperature, mean effective thermal conductivity, heat transfer coefficient, and the local Nusselt number on the front surface of the circular cylinder. It was found that the ratio between the input velocity to the present velocity on the surface of the circular cylinder remains consistent and reaches up to a maximum of 2.2% and the process of heat transfer does not affect by the moving of the screen and clearly with the raise of power-law indexes the distribution of the heat transfer upsurges. On validation with two experimentally derived correlations, it was also found that the results obtained for the shear-thinning fluid are more precise than the numerically calculated results for the Newtonian as well as shear-thickening cases. Finally, we suggest the necessary measures to enrich the the development of convection when observing with the strong effects influenced by screens or screen boundary conditions.

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Study of intensification of the heat transfer in helically coiled tube heat exchangers via coiled wire inserts

Cited by 39 publications

References 40 publications

Flow pattern maps, pressure drop and performance assessment of horizontal tubes with coiled wire inserts during condensation of R-600a

Flow pattern maps, pressure drop and performance assessment of horizontal tubes with coiled wire inserts during condensation of R-600a

Numerical method and analysis of a tube indirect evaporative cooler

Analysis of Power Law Fluids and the Heat Distribution on a Facing Surface of a Circular Cylinder Embedded in Rectangular Channel Fixed With Screen: A Finite Element’s Analysis

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