Momentum and heat transfer in helical coils

Tarbell, John M.; Samuels, Michael R.

doi:10.1016/0300-9467(73)80002-4

Cited by 66 publications

(24 citation statements)

References 13 publications

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“…Once more, this behavior stresses the importance of the viscous forces in the flow for low Reynolds number. As shown in Table 9, the friction factor values obtained with glycerol solutions flowing with simultaneous heat transfer, constant wall temperature as boundary condition, are similar to those obtained with the theoretical correlations of Mori Nakayama [11], Tarbell and Samuels [12] and Manlapaz and Churchill [13] and to those obtained with the experimental correlations of White [9], Ito [10] and Hart et al [14]; all of them valid for isothermal flow and physical properties calculated at the mean temperature of the fluid. Fig .…”

Section: Uncertainty Analysis Of the Resultssupporting

confidence: 81%

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Friction losses of Newtonian and non-Newtonian fluids flowing in laminar regime in a helical coil

Pimenta¹,

Campos

2012

Experimental Thermal and Fluid Science

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a b s t r a c tThis study aimed to carry out experimental work to determine, for Newtonian and non-Newtonian fluids, the friction factor (f c ) with simultaneous heat transfer, at constant wall temperature as boundary condition, in fully developed laminar flow inside a vertical helical coil. The Newtonian fluids studied were aqueous solutions of glycerol, 25%, 36%, 43%, 59% and 78% (w/w). The non-Newtonian fluids were aqueous solutions of carboxymethylcellulose (CMC), a polymer, with concentrations of 0.2%, 0.3%, 0.4% and 0.6% (w/w) and aqueous solutions of xanthan gum (XG), another polymer, with concentrations of 0.1% and 0.2% (w/w). According to the rheological study done, the polymer solutions had shear-thinning behavior and different values of viscoelasticity. The helical coil used has an internal diameter, curvature ratio, length and pitch, respectively: 0.00483 m, 0.0263, 5.0 m and 11.34 mm. It was concluded that the friction factors, with simultaneous heat transfer, for Newtonian fluids can be calculated using expressions from literature for isothermal flows. The friction factors for CMC and XG solutions are similar to those for Newtonian fluids when the Dean number, based in a generalized Reynolds number, is less than 80. For Dean numbers higher than 80, the friction factors of the CMC solutions are lower those of the XG solutions and of the Newtonian fluids. In this range the friction factors decrease with the increase of the viscometric component of the solution and increase for increasing elastic component. The change of behavior at Dean number 80, for Newtonian and non-Newtonian fluids, is in accordance with the study of Ali [4]. There is a change of behavior at Dean number 80, for Newtonian and non-Newtonian fluids, which is in according to previous studies. The data also showed that the use of the bulk temperature or of the film temperature to calculate the physical properties of the fluid has a residual effect in the friction factor values.

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Section: Uncertainty Analysis Of the Resultssupporting

confidence: 81%

“…White [9] 4.7 ± 3.8 Ito [10] 6.0 ± 4.1 Mori and Nakayama [11] 11.0 ± 9.0 Schmidt [8] 8.6 ± 4.6 Tarbell and Samuels [12] 8.0 ± 3.7 Manlapaz and Churchill [13] 6.0 ± 4.9 Hart et al [14] 5.0 ± 3.7…”

Section: Mean ± Standard Deviation (%)mentioning

confidence: 99%

Friction losses of Newtonian and non-Newtonian fluids flowing in laminar regime in a helical coil

Pimenta¹,

Campos

2012

Experimental Thermal and Fluid Science

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“…They stabilize the laminar flow regime, with transition Reynolds numbers in coiled tubes being several times larger than in straight tubes (Taylor, 1929). Heat and mass transfer rates at the wall are augmented by secondary flows because they exchange fluid near the wall with fluid from the interior (Weissman and Mockros, 1968;Tarbell and Samuels, 1973). Also, axial dispersion is decreased in both the laminar and turbulent flow regimes due to the crosssectional mixing (Koutsky and Adler, 1964).…”

Section: Secondary Flowmentioning

confidence: 97%

Separation of fine particle dispersions using periodic flows in a spining coiled tube

Papanu¹,

Adler²,

Gorensek³

et al. 1986

AIChE Journal

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“…Correlations for estimation of pressure drop was proposed by Ito (1959), Srinivasan et al (1968), Tarbell & Samuels (1973), Ruffel (1974), Xin et al (1997), Ju et al (2001), Guo et al (2001) etc. Ali (2001 and Naphon, & Wongwises (2006) has consolidated correlations for estimation of pressure drop for flow through helical pipes.…”

Section: Pressure Drop In Single-phase Flowmentioning

confidence: 99%

Helically Coiled Heat Exchangers

Jayakumar¹

2012

Heat Exchangers - Basics Design Applications

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Momentum and heat transfer in helical coils

Cited by 66 publications

References 13 publications

Friction losses of Newtonian and non-Newtonian fluids flowing in laminar regime in a helical coil

Friction losses of Newtonian and non-Newtonian fluids flowing in laminar regime in a helical coil

Separation of fine particle dispersions using periodic flows in a spining coiled tube

Helically Coiled Heat Exchangers

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