Performance of Louvered Devices as Air MixersU.S. National Bureau of Standards, 1970 - 20 pages As part of a study evaluating methods for reducing thermal gradients within the cross section of an air stream, three louvered mixing devices were investigated. Each of these devices was found to be capable of reducing the cross-sectional nonuniformity of air temperature to a few percent of the entering value. |
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Page 2
... upstream from the section shown as B - B in figure 1. The partitions in the circular duct di- vided the duct space or air stream into four equal pie - shaped quadrants . The portions of the apparatus immediately upstream and downstream ...
... upstream from the section shown as B - B in figure 1. The partitions in the circular duct di- vided the duct space or air stream into four equal pie - shaped quadrants . The portions of the apparatus immediately upstream and downstream ...
Page 3
... upstream station was stationary and the down- stream station was movable . At each station an array consisting of 24 copper - constantan ther- mocouples constructed of 30 gage ( A.W.G. ) wire was used . Thermocouples were calibrated at ...
... upstream station was stationary and the down- stream station was movable . At each station an array consisting of 24 copper - constantan ther- mocouples constructed of 30 gage ( A.W.G. ) wire was used . Thermocouples were calibrated at ...
Page 5
... upstream and downstream distribution were made for each set . An average upstream stan- dard deviation and an average downstream standard deviation were obtained from the five sets . A value of effectiveness , which would give an ...
... upstream and downstream distribution were made for each set . An average upstream stan- dard deviation and an average downstream standard deviation were obtained from the five sets . A value of effectiveness , which would give an ...
Common terms and phrases
0.92 duct diameter 4.75 DUCT DIAMETERS air flow Air Mixers air passed AIR STREAM VELOCITY apparatus automatic data processing baffles blower Building Science Series Bureau of Standards cents circular band concentric louver mixing CONCENTRIC TEMPERATURE PATTERN cross section deg F Devices as Air DIAMETER DUCT FPM DIAMETERS MEAN VELOCITY direct the air DISTANCE BETWEEN MIXING downstream measuring station Drop Across Mixer Duct Diam DUCT DIAMETERS MEAN duct wall elements in series evaluated flow rate held constant louver angle louver mixing device LOUVER SETTING louver-baffle mixing device louvered strip mixing MEAN AIR STREAM ment metal mixing effectiveness mixing elements National Bureau normal path outer area overall distance path of flow PATTERN THREE QUADRANTS percent pitot-static tubes QUADRANT COOL QUADRANT TEMPERATURE PATTERN Resistance Thermometer shown in figure spacing between mixing standard deviation strip mixer strip mixing device tempera TEMPERATURE PATTERN THREE test conditions THERMOCOUPLES THREE QUADRANTS WARM tion ture velocity head
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Page 1 - A schematic of the apparatus is shown in figure 1. Figure 2 is a photograph of the apparatus.
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