126 one can also group cd and e in eq 6124 to form the

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Unformatted text preview: nternational Organization for Standardization.) Conical diffuser: Throat tap θ < 15° D 2 0.7d d 2 Flow (c) 1. Corner taps where the plate meets the pipe wall 2. D: 1 D taps: pipe-wall taps at D upstream and 1 D downstream 2 2 3. Flange taps: 1 in (25 mm) upstream and 1 in (25 mm) downstream of the plate, regardless of the size D Types 1 and 2 approximate geometric similarity, but since the flange taps 3 do not, they must be correlated separately for every single size of pipe in which a flange-tap plate is used [30, 31]. Figure 6.40 shows the discharge coefficient of an orifice with D: 1 D or type 2 taps 2 in the Reynolds-number range ReD 104 to 107 of normal use. Although detailed charts such as Fig. 6.37 are available for designers [30], the ASME recommends use of the curve-fit formulas developed by the ISO [31]. The basic form of the curve fit is [42] Cd where f( ) 91.71 f( ) 2.5 ReD0.75 0.5959 0.09 1 2.1 0.0312 4 4 F1 0.184 0.0337 3F2 (6.132) 8 The correlation factors F1 and F2 vary with tap position: | v v Corner taps: | e-Text Main Menu | F1 0 Textbook Table of Contents F2 | 0 Study Guide (6.133a) 400 Chapter 6 Vis...
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This note was uploaded on 10/27/2009 for the course MAE 101a taught by Professor Sakar during the Spring '08 term at UCSD.

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