Cellular Automata by E. F. Codd, Robert L. Ashenhurst

By E. F. Codd, Robert L. Ashenhurst

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3365 (1965). S. 1042: 2A : 1973, Methods for the measurement of fluid flow in pipes. Part 2. Pitot tubes. Class A accuracy, British Standards Institution, London (1973). H. E. DALL, Withdrawable pitot devices for pipelines, Instrum. Engr 3 (1962) 135. H. f Flugtechnik u. Motorluftschiffahrt 22 (1931) 321. A. H. GLASER, The pitot cylinder as a static pressure probe in turbulent flow, / . Scient. Instrum. 29 (1952) 219. F. A. L. WINTERNITZ, Cantilevered pitot cylinder, Engr 199 (1955) 729. W. WUEST, Eigenschaften von Zylindersonden zur Strömungsmessung, Z.

1. The values of AT given in this table are mean values. 1. PITOT-STATIC FACTORS AT Low REYNOLDS NUMBERS Tapered-nose tube (3-8 mm dia) Reynolds No. (a) 330 655 985 1310 1640 1970 2295 2625 2950 3280 K 1020 0-989 0-995 0-992 0-991 0-992 0-995 0-998 0-999 1000 Hemispherical-nose tube (3-9 mm dia) Reynolds No. (a) 335 670 1000 1335 1670 2005 2340 2675 3005 3340 K 1055 1006 1001 0-996 0-992 0-991 0-992 0-996 0-999 1001 (a) The Reynolds numbers were derived from integral values of air speed in feet per second at 15°C and 760 mm Hg.

CHARACTERISTICS OF PITOT AND STATIC TUBES 55 holes are measured (not equalized) and the flow direction is deduced from them by means of prior calibration. For convenience, the design of a probe used in this way should be such that the pressure differences are related linearly to the angles made by the probe axis to theflowdirection. Further details may be found in ref. 13 ; and also in refs. 29 and 30, which include information about sensitivity and the effects of changes in Reynolds number and Mach number, and discuss the choice of method and procedure for particular circumstances.

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