HEV Static Mixer Bulletin - Chemineer - #1

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^Kenics Bulletin 811 HEV High Efficiency Static Mixer Chemineer's latest technology brings you the newest design in static mixers. The patented Kenics High Efficiency HEV Static Mixer gives you pressure drops drastically lower than any other static mixer available today and can be applied to any turbulent flow mixing problem regardless of line size or shape. Typical applications for the HEV include ail low viscosity liquid-liquid blending pfoblems. as well as gas-gas mixing. It is offered in unlimited sizes and mixes in the shortest possible pipe length for applications having space restrictions. HEV Technology University studies of turbulence led to the understanding of fluid flow phenomena that made the development of the HEV Static Mixer possible. Years of research have gone into defining the patented élément geometry parameters to maximize conversion to fluid energy into efficient mixing. The length, width, and atlack angle of the HEV mixing éléments have been optimized for mixing performance while limiting pressure drop. To create mixing action the mixing élément must impart momentum to the fluid stream. The level to which this momentum is converted to effective mixing versus wasted turbulence détermines the mixer efficiency. Because the HEV is configured to promote a "natural" mixing pattern. the redirection of the flow stream results in virtuatly no loss of pumping energy. The benefit you gain is minimum pressure loss and signiticant energy savings compared to static mixers using more disruptive-type mixing éléments. The HEV mixing élément consists of spécial patented trapezoidal tabs mounted at an acute angle relative to the downstream surface of the mixer housing. As the process stream strikes the base of the tab. it is deflected up the angled incline creating a pressure gradient between the upstream and downstream surfaces of the tab. This pressure differential causes the fluid to flow around the opposite sides of the tab generating alternating tip vortices having their axes of rotation oriented in the direction of the main fluid flow. The alternating rotations of the tip vortices induce vigorous cross-stream mixing which results in rapid uniformity of the process components. Full-scale mixing tests have confirmed the performance of the HEV and have resulted in highly accurate équations for predicting uniformity levels. Thèse équations evaluate various parameters such as side-stream ratio and injection techniques that are influential to the process performance of the mixer. Control of thèse parameters allows the HEV to be applied with complète certainty. Uniformity Criteria Comprehensive testing of the HEV mixer using tracer injection techniques has quantified its mixing performance. Multi-point sampling probes were utilized to generate stream uniformity data. Statistical analysis applied to this data resulted in the équations that predict mix quality as a function of the inlet and outlet coefficient of variation (CoV0 and CoV. respectively). By knowing the inlet stream conditions any desired level of uniformity can be achieved by adjusting the design of the HEV. US. Patent No. 4. KS.OSe. Otnc patents penOing l