Experimental study of the airside performance of tube row spacing in finned tube heat exchangers

Halici, Fethi; Taymaz, İmdat

doi:10.1007/s00231-005-0042-1

Cited by 16 publications

(4 citation statements)

References 4 publications

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“…This is consistent with the general trends that have been observed for circular tube stacks by for instance Kays and London 16 and by Halici and Taymaz. 24 However, in the high Reynolds number region of case A, the friction factor increases rapidly with increasing Reynolds number and the last point almost meets the curve of case C. In case A, the tube passage form convergent divergent ducts, with an area ratio considerably larger than in cases B and C. As the Mach number increases through the tube array, it reaches a relatively high value entering the last tube column. The small area, increase in stagnation temperature and reduction of stagnation pressure cause the flow to choke in the smallest passage, and then accelerate further into the divergent part where a shock occurs.…”

Section: External Side Results -Transversal Spacing Variationmentioning

confidence: 80%

Conceptual design of a two-pass cross-flow aeroengine intercooler

Zhao

Grönstedt

2014

Proceedings of the Institution of Mechanical Engineers, Part G:

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Establishing an optimal intercooled aeroengine constitutes a coupled problem where the conceptual design of the intercooler and the engine has to be considered simultaneously. The heat transfer and pressure loss characteristics will depend on the choice of the intercooler architecture. Hence, to be able to optimize the performance of an intercooled aeroengine, the performance characteristics of a given intercooler architecture has to be known in the parameter range anticipated for the aeroengine optimization. Here, the conceptual design of a tubular two-pass crossflow intercooler architecture intended for a turbofan aeroengine application is presented. The internal flow is simulated applying a porous media model for the intercooler tubes, whereas the connecting ducts are analyzed with threedimensional simulations allowing the assessment of a number of design solutions. The external flow is treated with two-dimensional simulations investigating the external pressure loss and heat transfer characteristics of the two elliptical tube stacks. The intercooler performance is then generalized by developing a reduced order correlation covering a parameter range anticipated for a turbofan conceptual design optimization. The paper constitutes a first effort to establish an open literature complete set of correlations for the prediction of aeroengine intercooler performance.

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Section: External Side Results -Transversal Spacing Variationmentioning

confidence: 80%

Conceptual design of a two-pass cross-flow aeroengine intercooler

Zhao

Grönstedt

2014

Proceedings of the Institution of Mechanical Engineers, Part G:

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“…Initial diameter, thickness and pitch of the fins were selected according to the recommendations of the authors dealing with the problem of finned tubular heat exchangers [4,12,13,14,22,28,29,30,31].…”

Section: Physical Model Of Heat Exchanger With Needle-shaped Finsmentioning

confidence: 99%

Development of a new type of finned heat exchanger

Bošnjaković

Čikić²,

Muhič

et al. 2017

Teh. vjesn.

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Original scientific paper A new geometric form of fins (needle fins) for finned heat exchangers of gas-liquid type is described. It achieves a higher heat transfer coefficient and lower mass of the heat exchange surface relative to the heat exchangers with circular fins which in this case served as a basis for comparison. For the analysis of the heat transfer, the computational fluid dynamics analysis with ANSYS Fluent software was applied. Numerical simulation was performed for the round fins and fins with a new, innovative geometric shape at air flow speeds of 1 m/s to 5 m/s. The results of numerical simulations, with regard to the exchanged heat and pressure drop were verified by the correlations available in the literature and compared to the simulation results for tubes with innovative fins. Results show an increase in the amount of Nu from 20 % to 30 % for 2300 >Re > 12000 while reducing mass of heat exchange surfaces of 23,8 %.Keywords: finned heat exchanger; heat exchange; heat exchanger efficiency; needle fins; numerical simulation Razvoj novog tipa lamelnog izmjenjivača toplineIzvorni znanstveni članak Opisan je novi geometrijski oblik lamele (igličaste lamele) za orebrene cijevne izmjenjivače topline plin -tekućina pomoću kojeg se postiže veći koeficijent prijelaza topline, a time i manja masa izmjenjivačkih površina u odnosu na izmjenjivače topline s okruglim lamelama koji su u ovom slučaju poslužili kao baza za usporedbu. Za analizu izmjene topline i pada tlaka primijenjena je računalna dinamika fluida s programom ANSYS Fluent. Numerička simulacija provedena je za slučaj zagrijavanja zraka koji struji oko cijevi s lamelama novog geometrijskog oblika te oko cijevi s lamelama konvencionalnog kružnog oblika brzinama od 1 m/s do 5 m/s. Rezultati numeričke simulacije obzirom na izmijenjenu toplinu i pad tlaka za cijevi s okruglim lamelama provjereni su pomoću korelacija dostupnih u literaturi te su uspoređeni s rezultatima simulacije za cijevi s inovativnim lamelama. Rezultati pokazuju povećanje iznosa Nu značajke od 20 % do 30 % za 2300 > Re > 12000 uz smanjenje mase izmjenjivačkih površina od 23,8 %.

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“…Spray drying is a versatile and efficient process whose application can be found in different fields like food, ceramic, and other industries [1][2][3][4][5][6][7][8][9][10]. Caused of these applications, different research has been performed to clarify several aspects of this process [11][12][13][14][15][16][17][18][19][20][21]. Caused of the considerable energy consumption by the spray dryers [22][23][24], decreasing their energy usage by different approaches like heat recovery has been the subject of several works [25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Employing the H-type finned heat exchangers with the circular tube for energy-saving purposes of the spray dryers

Moghaddam,

Javaherdeh

2024

Preprint

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In this paper, two heat exchangers along with 50% recirculation of exhaust air are used to recover the exhaust heat from the spray dryers and use them to preheat the atomizing and drying air. The H-type finned heat exchangers with circular holes are used here. All of the results are extracted by two different approaches, including standard k-ε and SST k-ω models. First, the influence of different parameters on the performance of the first and second heat exchangers is evaluated. It is shown that the Nusselt number increases by increasing the Reynolds number. While the friction factor of both heat exchangers decreases. Then, the influence of adding heat exchangers on the energy consumption of the factory and spray dryer is estimated. It is shown that the suggested system can be effectively used to 23.52% decrease the energy consumption of the spray dryer.

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Experimental study of the airside performance of tube row spacing in finned tube heat exchangers

Cited by 16 publications

References 4 publications

Conceptual design of a two-pass cross-flow aeroengine intercooler

Conceptual design of a two-pass cross-flow aeroengine intercooler

Development of a new type of finned heat exchanger

Employing the H-type finned heat exchangers with the circular tube for energy-saving purposes of the spray dryers

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