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  • FLUID MECHANICS AND HEAT TRANSFER  (6)
  • 1990-1994
  • 1955-1959  (6)
  • 1955  (6)
  • 1
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    Impingement of Cloud Droplets on a Cylinder and Procedure for Measuring Liquid-Water Content and Droplet Sizes in Supercooled Clouds by Rotating Multicylinder Method (1955)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: No abstract available
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NACA-TR-1215
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Impingement of Water Droplets on NACA 65A004 Airfoil at 0 Deg Angle of Attack (1955)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The trajectories of water droplets in the air flowing past an NACA 6511004 airfoil at a n angle of attack of 0 deg were determined. The amount of water in droplet form impinging on the airfoil , the area of droplet impingement, and the rate of droplet impingement per unit area on the airfoil surface were calculated from the trajectories and presented t o cover a large range of flight and atmospheric conditions. These impingement characteristics are compared briefly with those previously reported for the same airfoil at angles of attack of 4 deg and 8 deg.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NACA-TN-3586
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    A Dye-Tracer Technique for Experimentally Obtaining Impingement Characteristics of Arbitrary Bodies and a Method for Determining Droplet Size Distribution (1955)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A dye-tracer technique has been developed whereby the quantity of dyed water collected on a blotter-wrapped body exposed to an air stream containing a dyed-water spray cloud can be colorimetrically determined in order to obtain local collection efficiencies, total collection efficiency, and rearward extent of impingement on the body. In addition, a method has been developed whereby the impingement characteristics obtained experimentally for a body can be related to theoretical impingement data for the same body in order to determine the droplet size distribution of the impinging cloud. Several cylinders, a ribbon, and an aspirating device to measure cloud liquid-water content were used in the studies presented herein for the purpose of evaluating the dye-tracer technique. Although the experimental techniques used in the dye-tracer technique require careful control, the methods presented herein should be applicable for any wind tunnel provided the humidity of the air stream can be maintained near saturation.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NACA-TN-3338
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Impingement of Water Droplets on a Sphere (1955)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Droplet trajectories about a sphere in ideal fluid flow were calculated. From the calculated droplet trajectories the droplet impingement characteristics of the sphere were determined. Impingement data and equations for determining the collection efficiency, the area, and the distribution of impingement are presented in terms of dimensionless parameters. The range of flight and atmospheric conditions covered in the calculations was extended considerably beyond the range covered by previously reported calculations for the sphere.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NACA-TN-3587
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Preliminary Data on Rain Deflection from Aircraft Windshields by Means of High-Velocity Jet-Air Blast (1955)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A preliminary experimental investigation is being conducted to determine the feasibility of preventing rain from impinging on aircraft windshields by means of high-velocity jet-air blast. The results indicate that rain deflection by jet blast appears feasible for flight speeds comparable with landing and take-off speeds of interceptor-type jet aircraft; however, attainment of good visibility through the mist generated by raindrop breakup presents a problem. For the simulated windshield and the lower windshield angles used in the investigation, air-flow rates of the order of 3.3 pounds per minute of unheated air per inch of windshield span were required for adequate rain deflection at a free-stream velocity of 135 miles per hour. A method has been devised whereby it is possible to produce large-diameter water drops (1000 to 1500 p.) in a moving air stream, without breakup, at speeds in excess of 175 miles per hour.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NACA-RM-E55E17a
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Variation of Local Liquid-Water Concentration About an Ellipsoid of Fineness Ratio 10 Moving in a Droplet Field (1955)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Trajectories of water droplets about an ellipsoid of revolution with a fineness ratio of 10 (10 percent thick) in flight through a droplet field were computed with the aid of a differential analyzer. Analyses of these trajectories indicate that the local concentration of liquid water at various points about an ellipsoid varies considerably and under some conditions may be several times the free-stream concentration. Curves of the local concentration factor as a function of spatial position were obtained and are presented in terms of dimensionless parameters that describe flight and atmospheric conditions. The data indicate that the expected local concentration factors should be considered when choosing the location of devices that protrude into the stream from aircraft fuselages or missiles, or when determining antiicing heat requirements for the protection of these devices.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NACA-TN-3410
    Format: application/pdf
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