Flow and heat transfer characteristics of a novel airfoil-based tube with dimples

• Autorzy: Pei Houju , Liu Meinan , Yang Kaijie , Zhimao Li , Liu Chao

Identyfikatory

DOI

10.24425/bpasts.2022.141984

• Języki publikacji: EN

Abstrakty

EN

The performance of a novel airfoil-based tube with dimples is numerically studied in the present work. The effect of Reynolds number Re, dimples number N, relative depth H/D, and cross-distribution angle α on flow and heat transfer characteristics are discussed for Re in the range between 7,753 and 21,736. The velocity contour, temperature contour, and local streamlines are also presented to get an insight into the heat transfer enhancement mechanisms. The results show that both the velocity magnitude and flow direction change, and fluid dynamic vortexes are generated around the dimples, which intensify the flow mixing and interrupt the boundary layer, resulting in a better heat transfer performance accompanied by a certain pressure loss compared with the plain tube. The Nusselt number Nu of the airfoil-based tube increases with the increase of dimples number, relative depth, and Reynolds numbers, but the effect of cross-distribution angle can be ignored. Under geometric parameters considered, the airfoil-based tube with N = 6, H/D = 0.1, α = 0° and Re = 7,753 can obtain the largest average PEC value 1.23. Further, the empirical formulas for Nusselt number Nu and friction factor f are fitted in terms of dimple number N, relative depth H/D, and Reynolds number Re, respectively, with the errors within ± 5%. It is found that the airfoil-based tube with dimples has a good comprehensive performance.

Słowa kluczowe

EN

heat transfer enhancement; airfoil-based tube; dimple; comprehensive performance

PL

wzmocnienie wymiany ciepła; rura; wgłębienie; wykonanie kompleksowe

• Wydawca: Polska Akademia Nauk, Wydział IV Nauk Technicznych
• Czasopismo: Bulletin of the Polish Academy of Sciences. Technical Sciences
• Rocznik: 2022
• Tom: Vol. 70, nr 4
• Strony: art. no. e141984
• Opis fizyczny: Bibliogr. 20 poz., rys., tab.

Twórcy

autor

Pei Houju

• Shanghai Aircraft Design and Research Institute Environment Control and Oxygen System Department, China

• https://orcid.org/0000-0003-4334-376X

autor

Liu Meinan

• College of Energy and Power Engineering, Jiangsu University of Science and Technology, China

autor

Yang Kaijie

• Key Laboratory of Aircraft Environment Control and Life Support, MIIT, Nanjing University of Aeronautics and Astronautics, China

autor

Zhimao Li

• Shanghai Aircraft Design and Research Institute Environment Control and Oxygen System Department, China

autor

Liu Chao

• Shanghai Aircraft Design and Research Institute Environment Control and Oxygen System Department, China

Bibliografia

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Uwagi

Opracowanie rekordu ze środków MEiN, umowa nr SONP/SP/546092/2022 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2022-2023).