CFD analysis of single-phase flows inside helically coiled tubes

Jayakumar, J. S.; Mahajani, Sanjay M.; Mandal, J.C.; Iyer, Kannan N.; Vijayan, P.K.

doi:10.1016/j.compchemeng.2009.11.008

Cited by 198 publications

(84 citation statements)

References 27 publications

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“…They showed the other two models are better than the standard k-e model in predicting turbulent flow and heat transfer in helical pipe. Jayakumar et al 18 numerically studied the effect of coil parameters on heat transfer by FLUENT code together with the realizable k-e turbulence model. Then, they developed the correlations for the prediction of Nusselt number.…”

Section: Introductionmentioning

confidence: 99%

A numerical study of flow characteristics in a helical pipe

Tang

Parameswaran

2016

Advances in Mechanical Engineering

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Flow characteristics and loss mechanism inside the helical pipe with large-caliber and large-scale Dean number were analyzed in this study. Numerical simulation was carried out for exploring velocity distribution, pressure field, and secondary flow by varying coil parameters such as Dean number, curvature radius, and coil pitch. The velocity gradient in the cross-section increases along the pipe and causes unsteady flow in the pipe. Large pressure differences in the 180°and 315°cross-section generate centrifugal forces on the pipe. The secondary flow is the major factor resulting in flow loss, presented obviously by the streamlines to analyze the effects of pipe parameters on the vortices. The vortex center shifts toward the upper wall with the increase in Dean number and takes a slight deflection with the increase in coil pitch. Meanwhile, a correlation of the flow loss extent inside the pipe as a function of friction factor was presented. The increases in curvature radius and coil pitch can diminish the friction factor to reduce flow losses. The accuracy of the numerical methodology was also validated by conducting corresponding experiments and empirical mathematical analysis. The maximum deviation between the experimental values and the simulated results of the pressure drop is just 2.9%.

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Section: Introductionmentioning

confidence: 99%

A numerical study of flow characteristics in a helical pipe

Tang

Parameswaran

2016

Advances in Mechanical Engineering

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“…A considerable amount of literature has been published on the CFD modeling of the heat transfer process in various types of apparatus, such as: pipelines with different geometry and shape (Han et al, 2012;Jayakumar et al, 2010;Rosaguti et al, 2006;Schietekat et al, 2014;Zheng et al, 2013), heat exchangers (Afrianto et al, 2014;Freund and Kabelac, 2010;Yataghene et al, 2009), mechanical mixers (Delaplace et al, 2001;Kougoulos et al, 2005) or static mixers (Habchi and Harion, 2014;Solano et al, 2012;Wang et al, 2011). There are also some studies concerning CFD simulations of heat transfer in nanofluids (Fard et al, 2010;Utomo et al, 2012), objects inserted in fluid flow (Defraeye et al, 2010;Zare and Hashemabadi, 2013) or heat exchange enhancement (Eesa and Barigou, 2010;van Goethem and Jelsma, 2014).…”

Section: Introductionmentioning

confidence: 99%

Computational Fluid Dynamics and Experimental Studies of a New Mixing Element in a Static Mixer as a Heat Exchanger

Konopacki¹,

Kordas²,

Fijałkowski³

et al. 2015

Chemical and Process Engineering

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The main aim of this work is to study the thermal efficiency of a new type of a static mixer and to analyse the flow and temperature patterns and heat transfer efficiency. The measurements were carried out for the static mixer equipped with a new mixing insert. The heat transfer enhancement was determined by measuring the temperature profiles on each side of the heating pipe as well as the temperature field inside the static mixer. All experiments were carried out with varying operating parameters for four liquids: water, glycerol, transformer oil and an aqueous solution of molasses. Numerical CFD simulations were carried out using the two-equation turbulence k-ω model, provided by ANSYS Workbench 14.5 software. The proposed CFD model was validated by comparing the predicted numerical results against experimental thermal database obtained from the investigations. Local and global convective heat transfer coefficients and Nusselt numbers were detrmined. The relationship between heat transfer process and hydrodynamics in the static mixer was also presented. Moreover, a comparison of the thermal performance between the tested static mixer and a conventional empty tube was carried out. The relative enhancement of heat transfer was characterised by the rate of relative heat transfer intensification.

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“…J.S. Jayakumar [2] observed that the use of constant values for the transfer and thermal properties of the fluid resulted in inaccurate heat transfer coefficients. Based on the CFD analysis results a correlation was developed in order to evaluate the heat transfer coefficient of the coil.…”

Section: Introduction:-mentioning

confidence: 99%