Experimental and CFD estimation of heat transfer in helically coiled heat exchangers

Jayakumar, J. S.; Mahajani, Sanjay M.; Mandal, J.C.; Vijayan, P.K.; Bhoi, Rohidas

doi:10.1016/j.cherd.2007.10.021

Cited by 357 publications

(119 citation statements)

References 31 publications

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“…CFD simulation of heat transfer processes has progressively become an accepted tool for design, optimization, modification and safety analysis of industrial equipment. The applications of CHT reported in the literature range from cases of basic character such as the simulation of impinging cooling jets (Uddin, 2008, Zu et al, 2009 or nozzle flows (Marineau et al, 2006) to more applied cases like heat exchangers (Sridhara et al 2005, Jayakumar et al, 2008, and to more advanced problems in nuclear reactors (Palko & Anglart, 2008, Jo & Kang, 2010, Péniguel et al, 2010 and fusion reactors (Encheva et al, 2007). Most of the examples mentioned above employ a URANS approach, implying that the Reynolds analogy between momentum transport and transport of heat through a turbulent Prandtl number is adopted in the simulations.…”

Section: Heat Transfermentioning

confidence: 99%

Numerical Simulation of Industrial Flows

Tinoco¹,

Lindqvist²,

Frid³

2010

Numerical Simulations - Examples and Applications in Computational Fluid Dynamics

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Section: Heat Transfermentioning

confidence: 99%

Numerical Simulation of Industrial Flows

Tinoco¹,

Lindqvist²,

Frid³

2010

Numerical Simulations - Examples and Applications in Computational Fluid Dynamics

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“…investigated the laminar forced convection in helical coiled tubes, heat transfer and pressure losses increase as the curvature ratio of the helical coiled tubes increases. Jayakumar et al (2008) studied numerically and experimentally the turbulent flow inside helical coils. The authors proposed a correlation of Nusselt number including different parameters.…”

Section: Introductionmentioning

confidence: 99%

Turbulent forced convection heat transfer in triangular cross sectioned helically coiled tube

Elashmawy

Kolsi

2016

Int. j. adv. appl. sci.

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A three-dimensional turbulent forced convective heat transfer and flow characteristic, in a helical triangular cross sectioned coiled tube is simulated using the k-ɛ standard turbulence model and compared to results corresponding to circular cross sectioned helical tube. A finite element method is employed to solve the governing equations. The effects of Reynolds number, on Nusselt number, velocity and temperature profiles are discussed. The numerical computations show the developments and distributions of heat transfer and flow fields in the tube. These profiles are altered by the effect of curvature inducing the centrifugal forces.

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“…Jayakumar et al employed the realizable − turbulence model with standard wall functions in their estimation of heat transfer in helically coiled heat exchangers [2]. They subsequently modeled the turbulence of two-phase flows using the "mixed k-ε model," based on the realizable k-ε model, for their study of the thermohydraulic characteristics of air-water two-phase flows in helical pipes [3].…”

Section: Introductionmentioning

confidence: 99%

Comparison and validation of turbulence models in the numerical study of heat exchangers

2015

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This study aims to validate numerical models for heat exchangers developed with the commercial package ANSYS®, comparing the results with data published in the literature. The methodology was based on the identification of programs, languages, mathematical models, and numerical models used by other researchers. Geometries were developed with SolidEdge® and DesignModeler®, discretization meshes with Meshing®, and subsequent configuration of standard k-ɛ and k-ω models with Fluent® and CFX®. For internal flow in concentric smooth straight tube exchangers, we recreated the predicted results with Nusselts varying between 100 and 250 and Reynolds regimes between 12*10 3 and 38*10 3 . The study of internal flow in the curved corrugated tube exhibited considerable approximation to the results predicted by Zachar's numerical correlation with Nusselt numbers in the range of 15-70 for Dean variations between 1*10 2 and 11*10 2 in laminar flow. Likewise, we validated the study of external flow in twisted curved tubes. Finally, Nusselt variations between 60 and 275 for Dean variations between 1*10 3 and 9*10 3 were modeled for completely developed laminar, transitional, and turbulent flow. The study shows the increase of heat flux associated with the change in the geometry of heat exchangers. It also demonstrates how numerical computer models can recreate realistic process conditions and thermo-fluid simulation by appropriately configuring systems.

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Experimental and CFD estimation of heat transfer in helically coiled heat exchangers

Cited by 357 publications

References 31 publications

Numerical Simulation of Industrial Flows

Numerical Simulation of Industrial Flows

Turbulent forced convection heat transfer in triangular cross sectioned helically coiled tube

Comparison and validation of turbulence models in the numerical study of heat exchangers

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