Flow coefficient test

This test is conducted using coarse aggregates (4-20 mm) and fine aggregates (0-4 mm) according to CEN EN 933-6 (2004). Angularity is expressed in reference to flow coefficient. For coarse aggregate, the flow coefficient is linked to the percentage of crushed and broken surfaces. As a result, this test can be used in association with the test specified in CEN EN 933-5 (2004). Shape and surface texture characteristics also influence the results. 

More details regarding the mass of test portion, equipment required, the procedure and how to determine flow coefficient (E ) is given in CEN EN 933-6 (2004). 

---

Flow capacity testing The usually special testing of a pressure relief device to determine its operating characteristics, including measured relieving capacity. This tests whether the valve flows the capacity as stated in the literature or as per given flow coefficients, or to simply determine the flow coefficient of the valve as such. This is done on a spot-check basis by independent notified bodies in limited locations worldwide especially approved for that purpose. 

Thrasher and Binder [ ] tested orifices down to 0.15 in. in diameter, with thickness varying from 0.005 to 0.060 in. They observed a very bad scattering of data for the 0.060-in.-thick orifice, verifying the observations of Grace and Lapple for thick orifices. They also observed that the flow coefficient was 10 to 15% higher than for thin orifices. Grace and Lapple also observed these higher values for thick orifices. 

No of Types of Test down Still water down Flow of acquifers Stability flow coefficient ence... 

In weir flow calculation formula, the flow coefficient is relate to the weir flow shrinkage and head loss for local resistance non-uniform velocity coefficient a is relate to the inhomogeneous degree of approach velocity in flume cross section and the ratio of weir head H and weir height P. Therefore, the value or expression of and a are not identical by test in specific conditions and certain circumstances at home and abroad. 

CEN EN 933-6 AC. 2004. Tests for geometrical properties of aggregates - Part 6 Flow coefficient of... 

This parameter / is quite important. Such factors as boundary-layer transition, separation, and heat- and mass-transfer coefficients depend upon the intensity of turbulence. Simulation of turbulent flows in testing of models requires that the Reynolds number and the intensity of turbulence be the same. One method used to measure intensity of turbulence is to utilize a hot-wire anemometer. 

Fig. (13) compares efficiency obtained by the five tested stages plus an additional test performed on a lower flow coefficient impeller new design was proved to be aligned with existing stage at lower flow coefficient than 0.1 and more efficient at high flow coefficient when transition from radial exit to mixed shows its beneficial effect. 

This chapter first provides an introduction to the acoustic properties of textiles, which include propagation, absorption, and scattering of sound. The properties can be characterized by various parameters such as flow resistance, transmission loss, absorption coefficient, and scattering coefficient. Test and evaluation methods for obtaining these parameters are discussed. Based on the acoustic properties of the textiles, acoustics designers can make use of textiles in buildings and office environments to optimize sound quaUty depending on particular requirements. 

The symbols and compositions of all the mixes are shown in Table 2. During preparation of the specimens two tests of workability have been performed the flow diameter test [4] and the slump test. The results are shown in the last columns of the Table 3 below. The coefficient of correlation between the two sets of workability data is r = 0.07. 

The three most extensively used types of flow-metering devices are the thin-plate square-edged oriflce, the flow nozzle, and the venturi tube. They are differential-head instruments and require secondaiy elements for measimement of the differential pressure produced by the primary element. The Supplement to ASME Power Test Codes Instruments and Apparatus, describes construction of the above primary flow-measuring elements and their installation as well as installation of the secondary elements. The method of flow measimement, the equations for flow computation, and the limitations and accimacy of measurements are discussed. Diagrams and tables showing the necessary flow coefficients as a function of Reynolds number and diameter ratio are included in the standards. Diagrams of the expansion factor for compressible fluids are given. 

The value of the coefficient of heat transfer from steam to sheet is determined by the conditions prevailiug on the inside and on the surface of the dryers. Low coefficients may be caused by (1) poor removal of air or other noncoudeusables from the steam in the cyhn-ders, (2) poor removal of condensate, (3) accumulation of oil or rust on the interior of the drums, and (4) accumulation of a fiber lint on the outer surface of the drums. In a test reported by Lewis et al. [Pulp Pap. Mag. Can., 22 (Februaiy 1927)] on a sulfite-paper diyer, in which the actual sheet temperatures were measured, a value of 187 W/(m °C) [33 Btu/(h ft" °F)j was obtained for the coefficient of heat flow between the steam and the paper sheet. 

Control of an evaporator requires more than proper instrumentation. Operator logs snould reflect changes in basic characteristics, as by use of pseuao heat-transfer coefficients, which can detect obstructions to heat flow, hence to capacity. These are merely the ratio of any convenient measure of heat flow to the temperature drop across each effect. Dilution by wash and seal water should be monitored since it absorbs evaporative capacity. Detailed tests, routine measurements, and operating problems are covered more fuUy in Testing Procedure for Evaporators (loc. cit.) and by Standiford [Chem. Eng. Prog., 58(11), 80 (1962)]. 

The original work by NACA and NASA is the basis on which most modern axial-flow compressors are designed. Under NACA, a large number of blade profiles were tested. The test data on these blade profiles is published. The cascade data conducted by NACA is the most extensive work of its kind. In most commercial axial-flow compressors NACA 65 series blades are used. These blades are usually specified by notation similar to the following 65-(18) 10. This notation means that the blade has a lift coefficient of 1.8, a profile shape 65, and a thickness/chord ratio of 10%. The lift coefficient can be directly related to the blade camber angle by the following relationship for 65 series blades ... 

The coefficient of discharge, Ko, is the actual flow divided by the theoretical flow and must be determined by tests for each type or style and size of rupture disk as well as pressure-relieving valve. For rupture disks, the minimum net flow area is the calculated net area after a complete burst of the disk, making allowance for any structural members that could reduce the net flow area of the disk. For sizing, the net flow area must not exceed the nominal pipe size area of the rupture disk assembly [1]. 

---