by H.M.S.O .
Written in English
|Series||Reports series; no.X/R1052|
|The Physical Object|
|Number of Pages||33|
induced current and the electromagnetic force with the liquid ﬂow velocity. Both of these effects in the measurement of the liquid metal are not negligible. 3. Assumption 3: Non-magnetic liquid. The measured liquid is assumed to be a non-magnetic liquid, and its permeability m is consistent with the permeability of the vacuum m0. Thus, the. Chapter 1. Electromagnetic Flow-measurement since Faraday 1 2. Induction Flowmeter Theory 10 3. Effects Peculiar to Liquid Metals 48 4. Other Techniques of Electromagnetic Flow- 86 measurement 5. An Appraisal of Electromagnetic Flow- measurement Appendix. Typical Magnitudes Bibliography Index Contactless Electromagnetic Phase-Shift Flowmeter for Liquid Metals 3 2. Mathematical model Basic equations Consider a medium of electrical conductivity σ moving with the velocity v = exV in an ac magnetic ﬁeld with the induction B alternating harmonically with the angularCited by: Experimental study of an electromagnetic flow meter for liquid metals based on torque measurement during pumping process Article (PDF Available) in Measurement Science and Technology 26(
Foreword; Preface; Nomenclature; 1. Electromagnetic flow-measurement since Faraday; 2. Induction flowmeter theory; 3. Effects peculiar to liquid metals; 4. Other. We present a theory of single-magnet flowmeter for liquid metals and compare it with experimental results. The flowmeter consists of a freely rotating permanent magnet, which is magnetized perpendicularly to the axle it is mounted on. When such a magnet is placed close to a tube carrying liquid metal flow, it rotates so that the driving torque due to the eddy currents induced by the flow is. Electromagnetic flowmeters (EMFs) Friedrich Hofmann, Dipl.-Ing., D Duisburg Principle and theory, in brief: Principle The figure shows the basic setup of an electromagnetic flowmeter (EMF) for completely filled pipelines. The EMF consists of a non-ferromagnetic measuring tube with an. The conventional form of an electromagnetic flowmeter is shown in Fig. distribution of the potential U inside the flowtube of the magnetic flowmeter is described by the Poisson type equation,, (1) ∇ 2 U= div v × B, where v is the velocity vector and B the magnetic flux density vector. Making an assumption of a rectilinear flow and a uniform magnetic field, Shercliff derived a.
Electromagnetic flow meters, or magmeters, are comprised of a transmitter and sensor that together measure flow. The magnetic flow meter’s sensor is placed inline and measures an induced voltage generated by the fluid as it flows through a pipe. Electromagnetic Flow Meters, simply known as mag flow meter is a volumetric flow meter which is ideally used for waste water applications and other applications that experience low pressure drop and with appropriate liquid conductivity required.. The device doesn’t have any moving parts and cannot work with hydrocarbons and distilled water. Mag flow meters are also easy to maintain. The Performance of Electromagnetic Flowmeters in a Liquid Metal Two-Phase Flow ﬂow. They concluded that a homogenous two-phase ﬂow generates the ﬂow induced e.m.f. of ∆UTP=∆USP/(1−α). Furthermore, they concluded that ∆UTP=∆USP/(1−α) was also valid without respect to ﬂow regimes or the homogeneity. The effect of liquid conductivity on flowmeter operation may be modeled by the following DC circuits: Here, a ten-fold (one order of magnitude) change in liquid resistance barely affects the measured voltage ( mV versus mV) because the flow transmitter’s voltage-sensing electronic circuit has such a high input impedance.