Flowmeter, dimensions

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Note that in some equations, the values of constants are a function of the system of units used. These constants have dimensions and are known as dimensional constants. For example, many flowmeters measure volumetric flow rates, Qv, by measuring heads of fluids, Ah. Typically, Qv oc a/Ah or Qv = csfKh. Here, as Qv[f y[Ah, c is a dimensional constant. Dimensionally, L3T-1[=] cs/L or c [=] L2 5T 1, and the value of c will depend upon the units of both Qr and Ah. 

FIGURE 6-30 Unrolled view cf electrode configuration ofANL solid/gas capacitive flowmeter all dimensions in cm electrodes are on outside surface of a ceramic tube electrode gap is 0.23 cm guard strip width, 0.34 cm and all electrodes are 0.036-mm copper foil. 

Tests were performed on a tapered land thrust bearing with dimensions of R] = 74.9 mm (2.95 in.), R2 = 119 mm (4.7 in.), 6 = 0.0381 mm (1.5 X 10 in.), and B = 27° with a 20X flat at Che end. The bearing was instrumented with proper flowmeters, thermocouples, and distance probes Co measure film thickness. The tests were conducted under severe starvation conditions Chat gave a range of Qg values from 0.125 to 0.25. The test results are compared with Che theoretical values in Figure 15. 

The ratio of the volumetric flowrate out of the purge vent to the volumetric flowrate in the capillary column is termed the split ratio and provides an estimate of and control over the actual volume of sample entering the column. Care should be taken when using the split ratio to estimate actual injected sample volume, or when using it in comparisons between methods on different instruments. There are subtle differences between instruments and measurement techniques that may affect the measured flows. For example, the column volumetric flowrate measured by injecting a nonretained substance is the average column flowrate, not the flowrate at the inlet, while a flowmeter connected to the split purge vent measures the volumetric flowrate at the vent, not in the inlet. With newer, electronically controlled systems, the flows are measured directly at the inlet, or are calculated from the entered inlet conditions and column dimensions. 

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