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.

Foliar Rainfall Retention

Foliar Rainfall Retention

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

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

A Material World

A Material World

Increased water demands against the backdrop of challenges on water sources are necessitating pipe infrastructure projects to ensure the reliable delivery of water for the long term. A major consideration for every potable water project is choosing from among the variety of pipe materials on the market. With reclaimed water

A Critical Role

A Critical Role

When it comes to moving water efficiently, pumps and valves play a critical role. Some efficiency concerns focus on the wastewater utility sector, where “the EPA state revolving funds are going to fixing failing existing sewers—not so much extending into new service areas as much as they have been, but

Solutions for the Drainage Dilemma

Solutions for the Drainage Dilemma

A quick perusal of once-popular English literature would show that the Victorians, and indeed a century of their predecessors, were eager to adopt any innovations to improve drainage. While most agrarian societies fought weather, taxes, and landlords to keep crops in the field, drainage for them and the estate managers

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

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

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