chimney effect

chimney effect

[′chim‚nē i′fekt]
(fluid mechanics)
The tendency of air or gas in a vertical passage to rise when it is heated because its density is lower than that of the surrounding air or gas.

chimney effect, flue effect, stack effect

The tendency of air or gas in a shaft or other vertical passage to rise when heated, owing to its lower density compared with that of the surrounding air or gas.
References in periodicals archive ?
Hypothesizing that the "chimney effect" of the vertical channels between the bales was contributing significantly to the fire growth, we designed a second experiment to test the effect of physical barriers across the vertical channels.
BRE Global, which runs fire testing in the UK, found materials and insulation used in cladding were combustible and "cavity barriers" between the cladding used to close a 50mm gap only expanded 25mm - creating a deadly "chimney effect" up the building.
The strong thermal conductivity contrasts between salt rocks and the surrounding sediments result in higher heat fluxes through salt diapirs and thus increased temperatures above salt domes, creating what has become known as the "salt chimney effect" (Figure 1; [2, 6, 8-14]).
There is a ceramic 'Belfast' style sink with mixer tap, and a feature brick chimney effect wall housing a range style cooker.
If the voids are not broken up with cavity barriers, then extreme heat can quickly spread upwards through convection in the 'chimney effect', spreading the fire upwards far faster than if the voids were separated with fire-rated material at specified intervals.
Should a fire break out, a "fire break" between every floor expands to block off that ventilation space and prevent a "chimney effect".
Dr Knapton said if this isn't done and a fire breaks out that gap could create a flue or chimney effect up which the fire could rush.
The design of our future home (a dome-vented yurt and a cupola-topped hard structure) will rely on the "chimney effect," in which hot air will rise and exit, drawing in cooler air from side windows to create airflow and regulate temperature.
The effect of infiltration on heating load has been simulated including chimney effect and varying wind environment.
"Displacement ventilation is on the horizon for retailers," he predicts, explaining that a floor-level diffuser the length of a wall or a refrigeration case pushes a tremendous amount of air out at low velocity so that the air pools out onto the store floor, creating a chimney effect that takes the warmer air up and above shoppers, while the cooler air at floor level allows the refrigeration equipment to operate more efficiently and maintain a comfortable shopping environment.
This clearance creates a chimney effect to move heat away from the refrigerator.
"It started under the stairs and travelled upwards, like a chimney effect.