Thermal mass flow meter

About: Thermal mass flow meter is a research topic. Over the lifetime, 1759 publications have been published within this topic receiving 21878 citations.

Air flow rate meter and method for producing an air flow rate meter

Abstract: When an air flow rate meter is used in the intake tube of internal combustion engines, such a meter typically having a flat substrate with at least one resistor film disposed on it, the problem arises of dirt deposits on the substrate end face facing into the flow, which cause undesirable changes in the characteristic curve compared with the calibrated new state of the air flow rate meter. The novel embodiment of the air flow rate member is intended to enable calibration based on conditions expected in practice. To produce the effect, while the air flow rate meter is new, of long-term soiling of an air flow rate meter substrate over a period of operation, a leading body, for instance shaped as a U, is disposed on the end face of the substrate facing into the flow. The leading body simulates a soiled effect while the air flow rate meter is still new, and this effect is taken into account in the calibration. The leading body may be of electrically conductive plastic or lacquer and may be connected to a ground line (15). The air flow rate meter is quite generally suitable for measuring flowing media.

Oil-water two-phase flow measurement with a V-cone meter in a horizontal pipe

Abstract: In petroleum industry, oil-water two-phase flows widely exist in production wells, and their measurements are of significance in oil well logging, transportations and etc. One of the techniques in common use in oil-water two-phase flow measurement is the differential pressure (DP) meters with a theoretic model connecting the mass flowrate of the mixture with the differential pressures generated by the throttling element installed inside the pipeline. In this work, a series of oil-water two-phase flow experiments were conducted in a horizontal pipe of 50 mm diameter and the flowrates were measured by a V-cone meter with a diameter ratio of 0.65. Available correlations of DP meters that developed from gas-water two-phase flows are adopted on the analysis of the measured data from the V-cone meter. A modified correlation is proposed based on the analysis and comparison between the available correlations. The experiments results have shown that the proposed method achieves better accuracy in oil-water two-phase flow measurement than other DP correlations.

Single-chip mass flow controller with integrated coriolis flow sensor and proportional control valve

Abstract: We have designed, fabricated and tested the, to our knowledge, first ever single-chip mass flow controller with an integrated Coriolis mass flow sensor and a proportional control valve. A minimum internal volume is obtained, because the complete fluid path is integrated in a single chip. We demonstrated that the system can control mass flow up to 70 mg h−1 nitrogen gas at an applied pressure of 500 mbar.

Flow system with high resolution proportional valve with customizable performance

Abstract: A flow system includes a proportional valve constructed of chemically inert materials (PTFE) to produce variable fluid flow rates of liquids including inert, and high purity, and even highly corrosive liquids. Gases of many varieties can also be flow controlled. The valve may be precisely set, either manually, or by use of an actuating motor, remotely or electronically, for various flow rates for the required fluid. The valve allows for specific proportional flow parameters to be programmed into valve structure and configuration to provide precise and repeatable highest resolution flow control for a wide variety of complex flow conditions (pressure, temperature and viscosity).