Experimental determination of heat transfer and friction in helically-finned tubes

Zdaniuk, Gregory J.; Chamra, Louay M.; Mago, Pedro J.

doi:10.1016/j.expthermflusci.2007.09.006

Cited by 99 publications

(67 citation statements)

References 14 publications

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“…Among them, we have selected the work carried out by Zdaniuk [15]. That work shows recent pressure drop data for a wide set of different pipe geometries and hydraulic regimes with water, what constitutes a worthy test to evaluate the accuracy of our model in relation to hydraulic analysis of internal finned tubes.…”

Section: Methodsmentioning

confidence: 99%

“…There are a huge number of experimental studies related to flow through internal finned pipes as they can be applied in cooling technology [11][12][13][14][15]. Among them, we have selected the work carried out by Zdaniuk [15].…”

Section: Methodsmentioning

confidence: 99%

“…Internally finned tubes have not been studied since the author's knowledge for solar trough collectors, but the advantages of this design for enhance heat transfer has been documented in a great amount of papers [11][12][13][14][15]. Concretely de work done by Zdaniuk (2008) [15] has been taken to qualify the hydraulic side of the model. Moreover, with the work carried out by Forristal [16], based on the commercial code EES [17] and validated with the experimental data of Dudley [18] for the AZTRAK facility [19], the thermal side of the problem has been qualified.…”

Section: Introductionmentioning

confidence: 99%

“…This paper presents CFD study using the commercial code FLUENT [9] that has been applied for solar trough collectors by Ravi Kumar (2009) [10]. Internally finned tubes have not been studied since the author's knowledge for solar trough collectors, but the advantages of this design for enhance heat transfer has been documented in a great amount of papers [11][12][13][14][15]. Concretely de work done by Zdaniuk (2008) [15] has been taken to qualify the hydraulic side of the model.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of internal helically finned tubes for parabolic trough design by CFD tools

2011

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This paper has analysed the effect of the utilization of internal finned tubes for the design of parabolic trough collectors with computational fluid dynamics tools. Our numerical approach has been qualified with the computational estimation of reported experimental data regarding phenomena involved in finned tube applications and solar irradiation of parabolic trough collector. The application of finned tubes to the design of parabolic trough collectors must take into account features as the pressure losses, thermal losses and thermo-mechanical stress and thermal fatigue. Our analysis shows an improvement potential in parabolic trough solar plants efficiency by the application of internal finned tubes.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Analysis of internal helically finned tubes for parabolic trough design by CFD tools

2011

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“…For such reason, we have qualified our numerical model with existing experimental data extracted from the available literature for hydraulic and thermal phenomena. From the hydraulic point of view, the validation was made with the results from the experiments carried out with internally helical tubes by Zdaniuk et al (2008). For the thermal point of view, the qualification of the CFD model was made with the AZTRAK experiments results (Moss and Brosseau, 2007).…”

Section: Methodology: Simulationmentioning

confidence: 99%

A technical note on application of internally finned tubes in solar parabolic trough absorber pipes

Muñoz

Abánades

2011

Solar Energy

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The heterogeneous incoming heat flux in solar parabolic trough absorber tubes generates huge temperature difference in each pipe section. Helical internal fins can reduce this effect, homogenising the temperature profile and reducing thermal stress with the drawback of increasing pressure drop. Another effect is the decreasing of the outer surface temperature and thermal losses, improving the thermal efficiency of the collector. The application of internal finned tubes for the design of parabolic trough collectors is analysed with computational fluid dynamics tools. Our numerical approach has been qualified with the computational estimation of reported experimental data regarding phenomena involved in finned tube applications and solar irradiation of parabolic trough collector. The application of finned tubes to the design of parabolic trough collectors must take into account issues as the pressure losses, thermal losses and thermo-mechanical stress, and thermal fatigue. Our analysis shows an improvement potential in parabolic trough solar plants efficiency by the application of internal finned tubes.

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Computational fluid dynamics‐based design of finned steam cracking reactors

et al. 2013

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The use of one-dimensional reactor models to simulate industrial steam cracking reactors has been one of the main limiting factors for the development of new reactor designs and the evaluation of existing three-dimensional (3-D) reactor configurations. Therefore, a 3-D computational fluid dynamics approach is proposed in which the detailed free-radical chemistry is for the first time accounted for. As a demonstration case, the application of longitudinally and helicoidally finned tubes as steam cracking reactors was investigated under industrially relevant conditions. After experimental validation of the modeling approach, a comprehensive parametric study allowed to identify optimal values of the fin parameters, that is, fin height, number of fins, and helix angle to maximize heat transfer. Reactive simulations of an industrial Millisecond propane cracker were performed for four distinct finned reactors using a reaction network of 26 species and 203 elementary reactions. The start-of-run tube metal skin temperatures could be reduced by up to 50 K compared to conventionally applied tubular reactors when applying optimal fin parameters. Implementation of a validated coking model for light feedstocks shows that coking rates are reduced up to 50%. However, the increased friction and inner surface area lead to pressure drops higher by a factor from 1.22 to 1.66 causing minor but significant shifts in light olefin selectivity. For the optimized helicoidally finned reactor the ethene selectivity dropped, whereas propene and 1,3-butadiene selectivity increased with a similar amount. The presented methodology can be applied in a straightforward way to other 3-D reactor designs and can be extended to more complex feedstocks such as naphtha.

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Experimental determination of heat transfer and friction in helically-finned tubes

Cited by 99 publications

References 14 publications

Analysis of internal helically finned tubes for parabolic trough design by CFD tools

Analysis of internal helically finned tubes for parabolic trough design by CFD tools

A technical note on application of internally finned tubes in solar parabolic trough absorber pipes

Computational fluid dynamics‐based design of finned steam cracking reactors

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