Tag: flow control

Flow control is a major rapidly evolving field of fluid dynamics. It implies a small change of a configuration serving an ideally large engineering benefit, like drag reduction, lift increase, mixing enhancement or noise reduction. This change may be accomplished by passive or active devices. Passive devices, like turbulators or roughness elements, are steady and require no energy by definition. Active control requires actuators which may be driven in a time-dependent manner and require energy.

Editor’s Comments: “The Greater Good”

It may have been a little jarring to hear at the beginning of the year that the Trump administration ordered the Environmental Protection Agency to take down its climate change website, or that it put a freeze on new EPA grants and contracts, or that EPA employees were told to

Landfill Odor Control

Landfill Odor Control

While perhaps the increased emphasis on separate collections of organic wastes such as food scraps and other green waste has contributed to more odors, the development of neighborhoods closer to what was once a remote MSW operation is the overriding factor, say industry observers. Marc L. Byers, owner of Byers

Odorous Assault

Odorous Assault

While perhaps the increased emphasis on separate collections of organic wastes such as food scraps and other green waste has contributed to more odors, the development of neighborhoods closer to what was once a remote MSW operation is the overriding factor, say industry observers. Marc L. Byers, owner of Byers

HVAC Payback

HVAC Payback

If owners of commercial office buildings can incorporate variable-frequency drives (VFDs) into their HVAC systems, more often than not they probably should, says Pete Miceli, vice president, regional engineering manager for real estate service, development, and investment management at Transwestern’s Midwest office. Recently, Transwestern installed VFDs for supply and return

Foliar Rainfall Factors

Foliar Rainfall Factors

Trees and forest systems play an important role in the water cycle by intercepting rainfall and regulating water flow to the soil for more efficient stormwater infiltration. Traditional urban development practices have reduced the function of these systems by eliminating the vertical structure (tree canopy cover), removing existing ground cover

Giving Your Talent the Right Tools

Giving Your Talent the Right Tools

Your company has successfully bid a job, and it’s time to examine the site for land clearing. What equipment will be essential? What is the process in tool selection for land clearing site preparation? How will the tools’ capabilities fit into that process, and throughout the project? How can common

Hydrovex TTT Membrane Flow Regulator Can Be Used in Washington State

Hudson, FL – 2gH Solutions, LLC announced today that the Washington Department of Ecology has determined that the Hydrovex TTT membrane flow regulator from Veolia Water Technologies Canada may be used as an acceptable means to meet the flow control standards established by the Department for stormwater detention facilities in

Guest Editorial: Dumbing Down Hydrology

Why are we dumbing down hydrology for engineers? When I say “dumbing down,” what I mean is that we (the stormwater profession) are telling engineers to use pre-computer, simple methods and techniques to size stormwater facilities. I recently asked a noted, national stormwater expert this question, and his response was

Cyber-Smarts Keep Systems Safe

Cyber-Smarts Keep Systems Safe

How can treatment plants and utilities best guard against cyber security threats? Specialists suggest understanding the structural assets and vulnerabilities of your system and thinking like a bad guy.

The increasing sophistication of contemporary hackers requires correspondingly sophisticated lines of defense, Andrzej Kawalec, chief technology officer for HPE Security Services told

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