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The meaning of a positive displacement flow meter is a volumetric flow meter. It is an instrument that determines flow rate by measuring the number of times a fluid flows through a chamber of a known volume. Here are some key points about volumetric flow meters: Working principle: The flow meter has one or more chambers of known volume inside. As the fluid flows, these chambers are filled and discharged by the fluid. By calculating the number of times the chambers are filled and discharged, the fluid flow rate can be accurately measured. Advantages: The volumetric flowmeter has high precision and stability, suitable for measuring high viscosity, low flow rate fluids, and situations that require high-precision measurement. Application: This flowmeter is widely used in the fields of petroleum, chemical, natural gas, water treatment, etc., for measuring the flow rate of various liquids. In summary, a positive displacement flow meter, also known as a volumetric flowmeter, is a high-precision and stable flow measurement instrument. 2. Advantages and disadvantages of Smith scraper flowmeter
Smith scraper flowmeter (Positive Displacement RotaryVane Meter) is composed of a scraper measuring chamber and a pressure bearing shell, which can maintain the factory processing accuracy in working state and ensure that the product measurement accuracy does not change with environmental changes.
. The straight through shell and rotating scraper ensure a large drainage volume, and are widely used in inventory control and settlement of important trade occasions such as crude oil, finished oil, solvents, chemicals, paints, fertilizers, and food. Feature ■ Excellent accuracy - Following the Rotary Vane principle, with a specially designed instrument measuring chamber, the pressure difference between the inlet and outlet is minimized across the measuring chamber, and the medium flow is optimized through the instrument, ensuring instrument accuracy. Extremely low pushing pressure - The latest flow path design provides extremely low pushing pressure. ■ Extremely high instrument repeatability - instrument repeatability reaches 0.05%. ■ Extremely long service life - The instrument adopts low friction ball bearings and a fixed path cam bracket, which enables the scraper to operate accurately according to the predetermined trajectory, ensuring long-term service life.3. ANSYS Workbench Beam Shell Structure Spectral Analysis (I) Beam Shell Modeling
Spectral analysis is a method for calculating the response of structures under various frequency transient excitations.
. This analysis involves excitations such as earthquakes and aircraft noise. This article takes the beam shell structure as an example to provide a detailed introduction to the spectral analysis method of ANSYS Workbench. When the aspect ratio of the structure exceeds 10, the stress along the length direction becomes the main analysis object, and the cross-section remains unchanged. At this time, beam elements can be applied. In ANSYS Workbench, Timoshenko beam elements are used by default, including Beam188 elements without intermediate nodes and Beam189 elements with intermediate nodes. The shell elements include Shell181 elements without intermediate nodes and Shell281 elements with intermediate nodes. The 3D model and related parameters of the beam shell structure used in this case are shown in the figure. The model framework is simulated using Beam188 elements