A custom designed hydrofoil impeller for mixing liquids that was designed to optimize fluid flow and reduce drag to achieve maximum efficiency is offered by Sharpe Mixers of Seattle, Washington.
The Sharpe HYFLOW 218 Impeller features a hydrofoil-style, 4-blade design with tapered blades that have a narrow, low-pitch section at the tip where the speed is fastest and a wider, higher-pitch section nearer the hub where it is slower. Producing maximum flow per unit horsepower, the curved blades resist bending under the stresses from fluid forces, 
reduce drag, and the 4-blade design is more stable than a 3-blade impeller, claims the firm.
Part of a complete family of impellers for a wide variety of applications and liquid viscosities, the Sharpe HYFLOW 218 Impeller is available in sizes from 3" up to 210" dia., made from 316 stainless steel, titanium, inconel, nickel, and other alloys. Available in 1-piece, all-welded, and split-hub designs, the blades are all welded to the hub in each configuration for maximum strength.
Monday, June 04, 2007
Hydrofoil Mixing Impeller optimizes fluid flow
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Drilling: Introduction
Drilling is easily the most common machining process. One estimate is that 75% of all metal-cutting material removed comes from drilling operations.
Drilling involves the creation of holes that are right circular cylinders. This is accomplished most typically by using a twist drill, something most readers will have seen before. The figure below illustrates a cross section of a hole being cut by a common twist drill: examples provided http://stahlgear.com
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