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

Impeller Selection Guide for Submersible Pumps

When selecting a submersible pump model, the question may arise of what type of impeller is best for the application. Many manufacturers offer a variety…

The AVANT™ MQ Series Brochure

The AVANT™ MQ Series is a new line of submersible pumps developed by Tsurumi Pump, an industry leader in submersible pumps for over 95 years.…

Blackmer® MAGNES Series Sliding Vane Pumps Solve Legacy Pain Points

Introduction There are some things you just can’t avoid: death, taxes, and a pump’s common operational pain points- leaks, dry run, solids handling, cavitation-causing NPSH…

Buffer & Barrier Fluids

Author: Mark Savage, FSA Member As operators of pumping equipment become more focused on the safety, reliability and environmental impact resulting from shaft seal leakage,…

Comments

Leave a Reply

Your email address will not be published.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

Sign up for our Newsletter


By submitting this form, you are consenting to receive marketing emails from: Empowering Pumps & Equipment, 2205-C 7th Street, Tuscaloosa, AL, 35401, http://www.empoweringpumps.com. You can revoke your consent to receive emails at any time by using the SafeUnsubscribe® link, found at the bottom of every email. Emails are serviced by Constant Contact