Autor segons l'article: Pallares, J; Fabregat, A; Lei, CW
Departament: Enginyeria Mecànica
Autor/s de la URV: Fabregat Tomàs, Alexandre / Pallarés Curto, Jorge María
Paraules clau: Vertical channel Turbulent flow Natural convection Laminar free-convection Direct numerical simulation Asymmetrical heating wall vertical channel solar chimney plates natural-convection natural convection infinite direct numerical simulation asymmetrical heating
Resum: We report direct numerical simulations of the fully developed turbulent natural convection flow of a Boussinesq fluid (Pr = 0.71) in a vertical channel. One wall is heated with a constant heat flux and the other is assumed to be perfectly insulated. Simulations were performed at three different Rayleigh numbers (Ra = 5 × 105, 106 and 5 × 106). Predictions of the time averaged velocities, temperatures and intensities of the fluctuations agree with experiments reported in the literature. Under the fully developed flow conditions considered in this study the shear stress is greater on thermally active wall than that on the adiabatic wall, but the turbulent intensities and the turbulent shear stress are greater near the insulated wall. Conversely, the intensities of the temperature fluctuations and turbulent heat fluxes are higher near the thermally active wall than those near the adiabatic wall. Contrary to the vertical channel with constant but different wall temperatures, where buoyancy and turbulent shear dominate the generation of turbulent kinetic energy, in the asymmetrically heated channel the turbulent shear stress is the principal mechanism of turbulent kinetic energy production as in a forced convection channel flow.
Àrees temàtiques: Thermodynamics Matemática / probabilidade e estatística Interdisciplinar General engineering Engineering, mechanical Engineering (miscellaneous) Engineering (all) Engenharias iii Engenharias ii Engenharias i Condensed matter physics Ciências ambientais Astronomia / física Arquitetura e urbanismo
Accès a la llicència d'ús: https://creativecommons.org/licenses/by/3.0/es/
Adreça de correu electrònic de l'autor: alexandre.fabregat@urv.cat jordi.pallares@urv.cat
Identificador de l'autor: 0000-0002-6032-2605 0000-0003-0305-2714
Data d'alta del registre: 2023-12-17
Versió de l'article dipositat: info:eu-repo/semantics/publishedVersion
Enllaç font original: https://www.sciencedirect.com/science/article/pii/S1290072923002132
URL Document de llicència: http://repositori.urv.cat/ca/proteccio-de-dades/
Referència a l'article segons font original: International Journal Of Thermal Sciences. 191
Referència de l'ítem segons les normes APA: Pallares, J; Fabregat, A; Lei, CW (2023). Direct numerical simulation of the fully developed turbulent free convection flow in an asymmetrically heated vertical channel. International Journal Of Thermal Sciences, 191(), -. DOI: 10.1016/j.ijthermalsci.2023.108352
DOI de l'article: 10.1016/j.ijthermalsci.2023.108352
Entitat: Universitat Rovira i Virgili
Any de publicació de la revista: 2023
Tipus de publicació: Journal Publications
Repositori URV