[′hed ‚lȯs]
(fluid mechanics)
The drop in the sum of pressure head, velocity head, and potential head between two points along the path of a flowing fluid, due to causes such as fluid friction.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

## pressure drop

The decrease in fluid pressure between two ends of a duct or pipeline, between two points in a system, across valves and fittings, etc., due to frictional losses; in a water-piping system a drop in fluid pressure also occurs between two points as a result of the difference in elevation between the two points.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
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Love Island star Michael Griffiths has said Jordan Hames "had a bit of head loss" and "stumbled at the first step" after he professed interest in India Reynolds while in a relationship with Anna Vakili.
Usually, the designers of the irrigation system utilize head loss equations existing in the literature, considering the internal diameters of the pipes informed by the manufacturers.
The ECOWIND will drive the air only where the fabric lies, thus avoiding head loss and lack of efficiency of the air flows.
Trash rakes are created for water velocity of approximately 2 feet/second (0.6 meters/second), in order to prevent extreme energy loss attributable to the head loss over the trash rakes.
Video footage sawOxlade-Chamberlainrace into a two game lead, declaring ofAlexander-Arnold: "He's starting to show early signs of head loss!".
where [h.sub.f] is the frictional head loss, L is the length of circular pipe, Q is the volume flux, and [K.sub.s] is the empirical coefficient.
Friction head loss: the system is using 8-inch (0.2 m) diameter pipe to supply around 1700,000 liters water per day.
Upflow filtration has the advantage that the heavier particles are removed first at the bottom of the filter (1), and the system is able to store large amounts of solids at a very low head loss (2).
Pumps are sized based on the flow rate for a given amount of "feet of head," called the "total dynamic head." The total dynamic head is the vertical lift of water, measured in feet, from the level of the water source up to a tank or higher discharge point, plus the head loss caused by friction in the piping and pipe fittings between the two points.
"I had a head loss in the game and it wasn't going well, so I lashed out at someone.

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