Ultrasonic (US) flow meters are devices for a fluid measurement using the ultrasonic principle. Current research project dealing with developing flowmeter an innovative channel shape. Previously work was aimed to topology optimization CFD methods. The final prototype has be analyzed experimentally verify velocity profiles in US section. obtained this region necessary as input sensor data evalua...

Weld shapes significantly impact nozzle safety, and a number of accidents have occurred due to cracking. In order improve weld safety reveal the effect shape on temperature field flowmeters, this study established four types welds, with ten different shapes. Through numerical calculation, in solid domain was systematically studied when flowmeter passed through high-temperature gas. The results ...

BACKGROUND Intra-operative flow measurement during coronary or peripheral bypass operations is helpful for ruling out technical failures and for prediction of complication and patency rates. Preclinical validation of the flowmeters is required in order to rely on the intra-operatively measured results. The aim of this study is to evaluate a new "dual beam Doppler" blood flowmeter before clinica...

An ultrasonic flowmeter could be advantageous over a differential pressure pneumotachograph having a constant error in varying conditions. The in vitro accuracy of ultrasonic tidal volume (VT) estimates for ventilated infants were evaluated. Flow linearity and frequency response were tested, as was the influence of humidity and oxygen content on the accuracy of VT estimates. The linearity was w...

This paper introduces the composition and working principle of field service gas flow standard device based on meter. Through analysis uncertainty verification measurement results, it is confirmed that meter method can be applied to flowmeter.

A flowmeter is described which may be used to measure gas flow in experimental situations. It may be adapted for use with any gas or gas mixture and be used to provide flows as small as 50 ml min-1. A mercury-in-glass manometer (sphygmomanometer) is used to measure the gas pressure proximal to a flow restrictor (consisting of a hypodermic needle hub) and it is this pressure head which, for a gi...

Purpose To evaluate the retinal microcirculation using a segmental-scanning Doppler optical coherence tomography (DOCT) flowmeter in a patient with Takayasu's arteritis (TA) with aortic valve regurgitation (AR). Observations We measured the retinal blood velocity (V), retinal blood flow (RBF), and retinal blood velocity profiles (RBVP) of the major retinal arterioles using a DOCT flowmeter. T...

• Indicator dilution technics have been employed by Malooly and co-workers J for the in vivo calibration of electromagnetic flowmeter probes. In attempting to apply this calibration procedure to the measurement of pulmonary arterial flow in anesthetized dogs, we noted that the presence of the flowmeter probe on the pulmonary artery was frequently associated with abnormal indicator dilution curv...