R, Harish
(2014)
Numerical investigation of buoyancy induced turbulent flows in partially open enclosures.
PhD thesis, Indian Institute of Technology Hyderabad.
Abstract
The buoyancy induced turbulent flows in ventilated enclosure with internal heat
source has important applications in building ventilations, solar energy receivers,
thermal management of electronic devices and enclosure fire dynamics. In naturally
ventilated buildings, the fluid flow is mainly driven by buoyancy and air exchange
through ventilation openings provides thermal comfort for building occupants.
During fire accidents in buildings and in long tunnels, larger temperature difference
induces strong buoyant plumes and the hot gas flow characteristics are important
for the design of fire safety and ventilation systems. The air flow patterns through
vertical openings such as doorways and windows are widely studied but very few
investigations are performed with horizontal or ceiling openings. The horizontal
vents are openings in ceilings, floors or smoke vent at roof top. The flow patterns
through horizontal openings are highly unstable in comparison with vertical
openings. Previous investigations through horizontal openings have not considered
the effects of heat source strength, vent aspect ratio, wind speed, wind direction,
heat source and vent locations.
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