Título:	Numerical prediction of local convective heat transfer and skin friction in eccentric annulus tube
Autor(es):	Ferrari, Jalusa Maria da Silva Kayser, Fábio Matos Goulart, Jhon Nero Vaz
Assunto:	Transferência de calor Tubos
Data de publicação:	2021
Referência:	FERRARI, J. M. S. ; KAYSER, F. M. ; GOULART, J.N.V. Numerical prediction of local convective heat transfer and skin friction in eccentric annulus tube. In: INTERNATIONAL CONFERENCE ON HEAT TRANSFER, FLUID MECHANICS AND THERMODYNAMICS (HEFAT), 15th., 2021, Virtual.
Abstract:	Non-isothermal turbulent flow was investigated in both concentric and eccentric annulus under the same thermal boundary conditions, using RANS and URANS/LES turbulence hybrid mode. Inlet temperature was prescribed at the entrance and constant wall heat flux, q” = 1000 [W/m²], was imposed on the inner's tube surface, while the outer wall was kept adiabatic. The annulus geometric parameters inner (d), outer (D) diameters and length (L) were kept unchanged throughout the computations, yielding d/D-ratio and L/Dh, 0.494 and 58.36, respectively. Two different eccentricities were simulated, e = 0 (concentric case) and 0.8. Stationary and time-dependent simulations were run for eccentric annulus, whereas for the concentric one only stationary solution was obtained. Transient runs in eccentric annulus of 0.8 showed periodic flow patterns producing high crossing velocity components and temperature fluctuations through the narrow gap. Further, such fluctuations also improved the quality of the convective heat transfer, lowering the inner wall temperature, mainly near the narrow gap. At the gap, the local convective heat transfer value with transient simulation was found almost 20% higher in comparison with the stationary case for e = 0.8. Simulations were carried out under Reynolds number of 7300 and Prandlt 0.71. The flow dynamic of the flow was not affected by the thermal field.
Unidade Acadêmica:	Faculdade de Ciências e Tecnologias em Engenharia (FCTE) – Campus UnB Gama
Licença:	Autorização concedida a Biblioteca Central da Universidade de Brasília pelo Prof. Jhon Nero Vaz Goulart, em 26 de outubro de 2021, para disponibilizar a obra gratuitamente, para fins acadêmicos e não comerciais (leitura, impressão e/ou download) a partir desta data. A obra continua protegida por Direito Autoral e/ou por outras leis aplicáveis. Qualquer uso da obra que não o autorizado sob esta licença ou pela legislação autorial é proibido.
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