Helically Coiled Heat Exchangers

Jayakumar, J. S.

doi:10.5772/22242

Cited by 3 publications

(4 citation statements)

References 53 publications

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“…It has been found that the turbulent intensity at the outer side becomes around 13.4% higher than its equivalent on the inner side. The effect of pitch circle diameter was analysed by Jayakumar [6]. Three coils were tested while keeping the pitch and the diameter of the pipe constant.…”

Section: Figure 2 the Parametric Explanation Of A Helically Coiledmentioning

confidence: 99%

“…Jayakumar stated that the pitch circle diameter is inversely proportional to the centrifugal forces, i.e. as the pitch circle diameter increases the effect of the centrifugal forces on the flow structure will be impaired [6]. In a fully developed region, a correlation has been formulated to relate the average Nusselt number to the curvature ratio which indicates that the average Nusselt number decreases as the pitch circle diameter decreases while keeping the pipe diameter constant as shown in Eq.…”

Section: Figure 2 the Parametric Explanation Of A Helically Coiledmentioning

confidence: 99%

“…Turning to discuss the influence of pitch variation, when the pitch is zero, that means there is no torsional effect on the flow; consequently, the only force which affects on the flow is the centrifugal force. Therefore, as the pitch increases the average Nusselt number increases as well [6]. In terms of pipe diameter, Jayakumar conducted a regression analysis to find the relationship between the pipe diameter and the average Nusselt number [6].…”

Section: = ∆mentioning

confidence: 99%

“…Therefore, as the pitch increases the average Nusselt number increases as well [6]. In terms of pipe diameter, Jayakumar conducted a regression analysis to find the relationship between the pipe diameter and the average Nusselt number [6]. It was found that there is a linear relationship between the average Nusselt number and the pipe diameter.…”

Section: = ∆mentioning

confidence: 99%

See 3 more Smart Citations

Investigate the Effect of Pitch Variations on Helically Coiled Pipe for Laminar Flow Region Using CFD

Faraj¹,

Azzawi²,

Yahya³

2020

IJHT

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Experimental investigations of the flows inside helically coiled pipe are difficult and may also be expensive, particularly for small diameters. Computational fluid dynamics (CFD) packages, which can easily construct the geometry and change the dimensions with 100% of accuracy, provide an alternative solution for the experimental difficulties and uncertainties. Therefore, a computational fluid dynamics (CFD) study was conducted to analyse the flow structure and the effect of varying the coil pitch on the coil friction factor and wall shear stress, through utilising different models' configurations. Three coils were tested, all of them sharing the same pipe and coil diameter: 0.005m and 0.04m respectively. Pitch variations began with 0.01, 0.05, 0.25 m for the first, second and third model respectively. In this study, the pressure drop was analysed, and the effects of this reduction on wall shear stress and coil friction factor were also examined using incompressible viscous laminar flow to elucidate the effect of varying coil pitch on the friction factor and wall shear stress. The results were validated by Ito's equation for the laminar flow and compared with the Hagen-Poiseuille resistance formula for a straight pipe.

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Section: Figure 2 the Parametric Explanation Of A Helically Coiledmentioning

confidence: 99%

Section: Figure 2 the Parametric Explanation Of A Helically Coiledmentioning

confidence: 99%

Section: = ∆mentioning

confidence: 99%

Section: = ∆mentioning

confidence: 99%

See 2 more Smart Citations

Investigate the Effect of Pitch Variations on Helically Coiled Pipe for Laminar Flow Region Using CFD

Faraj¹,

Azzawi²,

Yahya³

2020

IJHT

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Heat transfer coefficients for helical components inside an Absorption Heat Transformer

Demesa

Hernández

Siqueiros

et al. 2018

International Journal of Heat and Mass Transfer

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Solution of conjugate problem in a conical coil heat exchanger

Krutova

Zolotonosov

2020

IOP Conf. Ser.: Mater. Sci. Eng.

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Today, coil heat exchangers are widely used in various industries. A large number of works have been published devoted to the study of the characteristics of helical coil heat exchangers. According to the authors, conical coil heat exchangers have higher efficiency compared to helical ones. The article investigates the influence of the geometric parameters of conical coil heat exchangers on their effectiveness. The object of study is a conical coil heat exchanger with different tube diameters of the inner coil (di = 13, 15, 17 mm) and various number of turns (N = 6, 10, 14). Modeling was carried out in the Ansys Fluent software package. For each combination of the parameters, data were obtained on the temperature and velocity of the coolant at the outlet. It was found that a change in the number of turns by a factor of 2.3 leads to an increase in the temperature of the heated fluid by an average of 9.7 ° C. The effect of changing the diameter of the inner coil is non-linear.

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Helically Coiled Heat Exchangers

Cited by 3 publications

References 53 publications

Investigate the Effect of Pitch Variations on Helically Coiled Pipe for Laminar Flow Region Using CFD

Investigate the Effect of Pitch Variations on Helically Coiled Pipe for Laminar Flow Region Using CFD

Heat transfer coefficients for helical components inside an Absorption Heat Transformer

Solution of conjugate problem in a conical coil heat exchanger

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