Airflow smoke generation

An application of the smoke generation principle described above is the smoke wire." This simulates a line source and makes it possible to efteccively study the airflow patterns in a layer, which is often desirable. A thin steel wire is... 

Smoke generator A device that electri cally heats oil-producing smoke. The smoke is liberated from a nozzle by either thermal forces or by means of a fan and used to observe airflow patterns within a space or to observe leakage from ductwork, etc. 

Set up the smoke generator, with outlet tube pointing in the direction of airflow and located at the center of a grid area at the work zone entrance plane. 

Smoke tests. In order to attain a qualitative flow assessment inside the CCGT enclosure, tests were carried out using a smoke generator and recorded on video. The smoke used had a similar density to air and had the effect of making the airflow patterns visible inside the enclosure. The solid flooring resulted in a reduction in effective air movement and replacement with open flooring grid was recommended. 

Airflow Systems, Inc Resource for the collection and filtration of dust, smoke, mist, fumes and other airborne contaminants generated during industrial and commercial manufacturing and processing applications. http., llwww.air, flowsvstems. com... 

The capture velocity of a hood is defined as the air velocity created by the hood at the point of contaminant generation. The hood must generate a capture velocity sufficient to overcome opposing air currents and transport the contaminant to the hood. For enclosing hoods, capture velocity is the velocity at the hood opening. In this case, the velocity must be sufficient to keep the contaminant in the hood. In practice, hood shape and the influence of crossdrafts on the measured capture velocity have to be considered. All three velocity components should be measured and used to calculate the magnitude and direction of the total velocity. Other methods used, not as good as the previous one, are to measure the velocity with a directional velocity sensor towards the hood or to measure the net velocity by an omnidirectional velocity sensor. In the last method the main airflow direction should be viewed and evaluated by means of a smoke test (see Sections 10.2.1 and 10.2.2.1). 

Kennedy describes a method using an ultrasonic nebulizer to generate a fog of water droplets w hich is used in the same way as smoke to visualize airflows. Several types of nebulizers are available but they require an electrical connection and are not hand-held. Food dye can be added to the water to produce colored fog. The nebulizers are expensive (about 1500 ECU) but have negligible operating costs. Although the amount of smoke produced is small, it is nontoxic and nonirritating. 

A throwaway extended-pleated-medium dry-type filter with (1) a rigid casing enclosing the Ml depth of the pleats, (2) a minimum particle removal efficiency of 99.97% for thermally generated monodispersed DOP smoke particles with a diameter of 0.3 microns, and (3) a maximum pressure drop of 1 inch water gage when clean and operated at its rated airflow capacity. ... 

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