Thermal-fluid transport phenomena in strongly heated channel flows

Authors
Citation
S. Torii et Wj. Yang, Thermal-fluid transport phenomena in strongly heated channel flows, INT J N M H, 10(8), 2000, pp. 802-823
Citations number
26
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Mechanical Engineering
Journal title
INTERNATIONAL JOURNAL OF NUMERICAL METHODS FOR HEAT & FLUID FLOW
ISSN journal
0961-5539 → ACNP
Volume
10
Issue
8
Year of publication
2000
Pages
802 - 823
Database
ISI
SICI code
0961-5539(2000)10:8<802:TTPISH>2.0.ZU;2-R
Abstract
A theoretical study is performed to investigate transport phenomena in chan nel flows tender uniform heating from either both side walls or a single si de. The anisotropic t(2) - Et heat-transfer model is employed to determine thermal eddy diffusivity. The governing boundary-layer equations are discre tized by means of a control volume finite-difference technique and numerica lly solved using a marching Procedure. It is found that tinder strong heati ng from both walls, laminarization occurs as in the circular tube flow case ; during the laminarization process, both the velocity and temperature grad ients in the vicinity of the heated walls decrease along the flow resulting in a substantial attenuation in both the turbulent kinetic energy and the temperature variance over the entire channel cross section; both decrease c auses a deterioration in heat transfer performance; and in contrast, lamina rization is suppressed in the Presence of one-side-heating, because turbule nt kinetic energy is produced in the vicinity of the other insulated wall.