Generic selectors
Exact matches only
Search in title
Search in content
Post Type Selectors

Theory Bites: Operating ‘Off’ Conditions Secondary Flows

Engineering & Design
Theory Bites SECONDARY FLOWS (1)

Theory Bites: Operating ‘Off’ Conditions Secondary Flows

Theory bites are a collection of basic hydraulic theory and will touch upon pump design and other areas of pump industry knowledge.

In fluid dynamics, a secondary flow is a relatively minor flow superimposed on the primary flow, where the primary flow usually matches very closely the flow pattern predicted using simple analytical techniques that assume the fluid is inviscid.

Many types of secondary flows occur in turbomachinery, including inlet prerotation (intakes vorticity), tip clearance flow (tip leakage), flows at off-design performance (e.g. flow separation), and secondary vorticity flows. Most pumps operate at high Reynolds numbers, and, in this regime of flow, most of the hydraulic losses occur as a result of secondary flows and turbulent mixing.

Off Conditions: Backflow in the impeller eye of this shrouded impeller pump. This backflow may well interact in an important way with the discharge-to-suction leakage flow that is an important feature of the hydraulics of a centrifugal pump at all flow rates.

Source: Hydrodynamics Of Pumps

Read more Theory Bites!

Related Articles

Related Whitepapers

Five Reasons To Choose A Bearingless Torque Sensor

Benefits that improve your torque measurements Best real-world accuracy Highest Overload Highest Overrange

Advanced Sealing and Condition Monitoring Strategies In Water and Wastewater Plants

Introduction As a plant/maintenance manager or reliability engineer for a water or wastewater facility, you want to know about the best technologies to help your…

Downthrust Measurement in Vertical Pumps Prevents Failure: The Benefits of Measuring Axial Force in Real-Time

“Himmelstein’s Thrustmeter has proven to be accurate and repeatable, which are two of the main things that define quality in an instrument. It’s been a…

Electricity, Power, and Emissions: Using Motor Power Data to Create a Climate-Informed Maintenance Plan

Take Action Today To Make Your Pumps More Efficient Pump motor power levels and energy consumption provide valuable input about the status of and changes…

Comments

Leave a Reply

Your email address will not be published. Required fields are marked *