This means no “square-root” characterization is necessary to obtain linear flow measurements with a laminar flowmeter. It is the only pressure-based flow measurement device for filled pipes that exhibits a linear pressure/flow relationship. Advantages of Laminar Flow MeterĪ unique advantage of the laminar flowmeter is its linear relationship between flow rate and developed pressure drop. The extremely restrictive nature of a capillary tube, of course, limits the use of such flow elements to very low flow rates such as those encountered in the sampling networks of certain analytical instruments. The small inside diameter of such a tube makes wall-boundary effects dominant, such that the flow regime will remain laminar over a wide range of flow rates. This pressure drop is permanent (no recovery of pressure downstream) because the mechanism of pressure drop is friction: total dissipation (loss) of energy in the form of heat.Īnother common form of laminar flow element is simply a coiled capillary tube: a long tube with a very small inside diameter. The large number of small-diameter tubes packed in the wide area of the element provide adequate wall surface area for the fluid’s viscosity to act upon, creating an overall pressure drop from inlet to outlet which is measured by the differential pressure transmitter. This decreases the Reynolds number to the point where the flow regime exhibits laminar behavior. The expanded diameter of the flow element ensures a lower fluid velocity than in the pipes entering and exiting the element. Laminar flow meter elements generally consist of one or more tubes whose length greatly exceeds the inside diameter, arranged in such a way as to produce a slow-moving flow velocity. K = Coefficient accounting for units of measurement ΔP = Pressure dropped across a length of pipe
This pressure drop created by fluid friction in a laminar flow stream is quantifiable, and is expressed in the Hagen-Poiseuille equation: Laminar flow is qualitatively predicted by low values of Reynolds number. The dominant mechanism for resistance to fluid motion in a laminar flow regime is friction with the pipe or tube walls. A flow stream in a state of laminar flow exhibits no turbulence, with each fluid molecule traveling in its own path, with limited mixing and collisions with adjacent molecules. Laminar flow is a condition of fluid motion where viscous (internal fluid friction) forces greatly overshadow inertial (kinetic) forces.
Mounting only submersed, minimum submersion depth 0.4m.ĭriver ambient temp.A unique form of differential pressure-based flow measurement deserves its own section in this flow measurement chapter, and that is the laminar flow meter. – Wide range input with active power factor correction – High quality IP65 motor cable connector – Auxillary port for peripheral devices (e.g. – Comprehensive safety functions, such as dry run warning, temperature alert, overcurrent protection, speed zero alert – SELF – Safety Extra Low Voltage (12V motor supply) – Integrated programming to generate waves, bursts and random flow patterns with additional BOOSTMODE to override actual programming (MCFS – Menu Controlled Flow Sequencer) – Precise speed adjustment in steps of 0.1% This product is developed and manufactured in Germany by venotec. The materials used are designed to have a long lifetime and meet the highest requirements and quality standards.
Easy programming (as in any Abyzz pump) and the possibility to link to external controllers offers a wide field of application. The integrated flow straightener provides a laminar and powerful water movement.
The special prop design and a well designed hydraulic lets the pump operate with almost no noise or vibration. Several mounting options are offered to suit any needs and due to many available mounting points, even a customer specific mounting can be done very easily. This composition ensures a long lifetime, thus granting highest sustainability and lowest carbon footprint. With the silicon carbide bearings and special hard metal shaft, ensures low-maintenance operation.Īll metal parts are made out of titanium grade 2 and other parts are made out of high quality plastics. The integrated bearing flushing provides optimum protection against calcification and, in conjunction Containing a very energy efficient motor and providing the exact adjustment for your application, it offers a very energy-saving solution. The innovative Abyzz Flow Cannon AFC150 “compact” with its high-end design including a titanium rotor unit and titanium housing consists of the pump itself and a powerful and programmable driver. Abyzz has just unveiled a brand-new product, the Abyzz Flow Cannon AFC150, which they will begin shipping next week from their German headquarters.
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