Figure 4: Scattered plot of transit-time ultrasonic flowmeter performance on 2-in horizontal bentonite-water mixture flow for bentonite concentration of 0.1 – 1.0 vol%.
In Figure 5, the scattered points of flow coefficient \(C\) for transit-time ultrasonic flowmeter have been found to stabilize as the flow speed exceeds 0.6 m/s. The flow coefficient is defined as the ratio of measured flow rate to the actual fluid rate. The equation is \(C=Q_{\text{meter}}/Q_{\text{actual}}\) or\(V_{\text{meter}}/V_{\text{actual}}\). The value of\(C\) should approach unity (=1) if the meter is accurate. But the mean flow coefficient \(\overset{\overline{}}{C_{\text{\ All}}}\) is obtained as 0.9651.