Effect of aspect ratio of enclosure on free convection from horizontal cylinders in Bingham plastic fluids

• Autorzy: Baranwal Ashok Kumar , Gupta Anoop Kumar , Tiwari Anurag Kumar , Melnik Roderick

Identyfikatory

DOI

10.24425/cpe.2022.140831

• Konferencja: The International Chemical Engineering Conference 2021 (ICHEEC): 100 Glorious Years of Chemical Engineering and Technology, September 16–19, 2021
• Języki publikacji: EN

Abstrakty

EN

Heat transfer in steady free convection from differentially heated cylinders enclosed in a rectangular duct filled with Bingham plastic fluids has been solved numerically for the ranges of the dimensionless groups as, Rayleigh number, 102 Ra 106; Prandtl number, 10 Pr 100 and, Bingham number, 0 Bn 50 for aspect ratios AR = 05, 0.6, 0.7, 0.8, 0.9 and 2. The streamlines, isotherm contours, yield surfaces, local and average Nusselt numbers were analysed and discussed. It is found that as the aspect ratio of the enclosure increases from 0.5 to 0.9, the average Nusselt number on the surface of the hot cylinder increases as a larger amount of fluid takes part in convection. Moreover, at sufficiently large Bingham numbers, yield stress forces dominate over buoyancy causing the flow to cease and thus the Nusselt number approaches its conduction limit. Finally, the Nusselt number approaches its conduction limit once the maximum Bingham number is reached.

Słowa kluczowe

EN

Bingham plastic fluids; aspect ratio; Rayleigh number; Nusselt number; natural convection

PL

płyn plastikowy Bingham; współczynnik proporcji; liczba Rayleigha; liczba Nusselta; naturalna konwekcja

• Wydawca: Komitet Inżynierii Chemicznej i Procesowej Polskiej Akademii Nauk
• Czasopismo: Chemical and Process Engineering
• Rocznik: 2022
• Tom: Vol. 43, nr 2
• Strony: 271--277
• Opis fizyczny: Bibliogr. 16 poz., wykr., rys.

Twórcy

autor

Baranwal Ashok Kumar

• Department of Chemical Engineering, BIT Sindri, Dhanbad 828123, India

autor

Gupta Anoop Kumar

• Department of Chemical and Biochemical Engineering, IIT Patna 801106, India

autor

Tiwari Anurag Kumar

autor

Melnik Roderick

• Wilfrid Laurier University, 75 University Avenue West, Waterloo, Ontario, Canada
• BCAM Basque Center for Applied Mathematics, Bizkaia, Spain

Bibliografia

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