Chapt06

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

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

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...
View Full Document

This note was uploaded on 10/27/2009 for the course MAE 101a taught by Professor Sakar during the Spring '08 term at UCSD.

Ask a homework question - tutors are online