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Chemical and Process Engineering Resources

Fluid Flow


Product Viscosity Versus Shear

Feb 11 2013 06:50 PM | Steve Hall in Fluid Flow

Many products are known to be “shear thinning,” which is a term given to materials that exhibit a decrease in viscosity when force is exerted. The viscosity of pseudoplastic fluids decreases with shear, and recovers quickly when the shear is removed. Examples include paper pulp in water, latex paint, molasses, and pharmaceutical suspensions (such as certain cough syrups).



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Centrifugal Pumps: Understanding Cavitation

Nov 08 2010 01:30 PM | Mukesh Sahdev in Fluid Flow

Operating a pump under the condition of cavitation for even a short period of time can have damaging consequences for both the equipment and the process. Operating a pump at low flow conditions for an extended duration may also have damaging consequenc...

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Valve Sizing and Selection

Dec 05 2011 03:20 PM | Chris Haslego in Fluid Flow

Sizing flow valves is a science with many rules of thumb that few people agree on. In this article I'll try to define a more standard procedure for sizing a valve as well as helping to select the appropriate type of valve. **Please note that the corr...

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Understanding Compressible Flow

Nov 08 2010 01:40 PM | rxnarang in Fluid Flow

Understanding the flow of compressible fluids in pipes is necessary for a robust design of process plants. The main difference between incompressible fluid, like water, and compressible fluid, vapor, is the greater change in pressure and density. This...

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Centrifugal Pumps: Basic Concepts of Operation,...

Nov 08 2010 11:30 AM | Mukesh Sahdev in Fluid Flow

The operating manual of any centrifugal pump often starts with a general statement, "Your centrifugal pump will give you completely trouble free and satisfactory service only on the condition that it is installed and operated with due care and is prope...

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Using Equivalent Lengths of Valves and Fittings

Nov 08 2010 01:20 PM | pleckner in Fluid Flow

One of the most basic calculations performed by any process engineer, whether in design or in the plant, is line sizing and pipeline pressure loss. Typically known are the flow rate, temperature and corresponding viscosity and specific gravity of the f...

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