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
... Causes of Variation in Chemical Analyses and Physical Tests of Portland Cement . 40 cents BSS18 . Smoke and Gases Produced by Burning Aircraft Interior Materials . 35 cents BSS19 . A Study of the Variables Involved in the Saturating of ...
... Causes of Variation in Chemical Analyses and Physical Tests of Portland Cement . 40 cents BSS18 . Smoke and Gases Produced by Burning Aircraft Interior Materials . 35 cents BSS19 . A Study of the Variables Involved in the Saturating of ...
Page 2
... causing the temperature near the wall of the duct to be different from that at the center of the stream . These patterns are fairly common in practice and should give meaningful informa- tion on the ability of a mixing device to prom ...
... causing the temperature near the wall of the duct to be different from that at the center of the stream . These patterns are fairly common in practice and should give meaningful informa- tion on the ability of a mixing device to prom ...
Page 4
... caused the forma- tion of a highly turbulent field downstream from the mixing device . Two louvered strip mixers of this construc- tion were placed in series for this study . The first mixer provided shearing action in the hori- zontal ...
... caused the forma- tion of a highly turbulent field downstream from the mixing device . Two louvered strip mixers of this construc- tion were placed in series for this study . The first mixer provided shearing action in the hori- zontal ...
Page 5
... caused the air to be directed in a direction opposite to that of the corresponding areas of the first set of concentric louvers . For each of the three mixers , tests were con- ducted to determine how a variation of each of the ...
... caused the air to be directed in a direction opposite to that of the corresponding areas of the first set of concentric louvers . For each of the three mixers , tests were con- ducted to determine how a variation of each of the ...
Page 20
... caused the air to rotate around the axis of the duct in a clockwise or counterclockwise direction de- pending upon the louver setting . The adjoining area was fitted with louvers set at an angle of 49 ° from the normal path and caused a ...
... caused the air to rotate around the axis of the duct in a clockwise or counterclockwise direction de- pending upon the louver setting . The adjoining area was fitted with louvers set at an angle of 49 ° from the normal path and caused a ...
Common terms and phrases
0.92 duct diameter 4.75 DUCT DIAMETERS air flow Air Mixers air passed AIR STREAM VELOCITY apparatus ASHRAE 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 Duct Diam DUCT DIAMETERS MEAN duct wall elements in series evaluated FIGURE 17 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 National Bureau normal path outer area 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 difference TEMPERATURE PATTERN THREE test conditions THERMOCOUPLES THREE QUADRANTS WARM tion ture U.S. Government Printing 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.
Page 20 - Announcement of New Publications in Building Science Series Superintendent of Documents, US Government Printing Office, Washington, DC 20402 Dear Sir: Please add my name to the announcement list of new publications to be issued in the series : National Bureau of Standards Building Science Series. Name Company Address City State Zip Code (Notification key N-339...