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head loss

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head loss

[′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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References in periodicals archive
Thus, the water level along the waterway rises gradually, the hydraulic head pressure difference was reduced, and the amount of leakage decreased.
Analysis of External Water Pressure for a Tunnel in Fractured Rocks
According to Bear [52], for flow in a saturated porous medium, the equation of mass conservation expressed in terms of hydraulic head is
Assessing Alternative Scenarios for the Cause of Underpressures in the Ordovician Sediments along the Eastern Flank of the Michigan Basin
Soil cores were initially wet from the bottom using capillary action under a -40 mm hydraulic head with the head increased to 0 mm (saturation) at a rate of 10 mm hydraulic head/h with Ca[Cl.sub.2] (EC 2) solution.
Towards incorporation of potassium into the disaggregation model for determination of soil-specific threshold electrolyte concentration
Lei [11] derived an analytical expression for hydraulic head, the stream function, and the inflow rate of the two-dimensional, steady ground water flow near a horizontal tunnel.
Effect of Presence of Single Cavity Upstream Side of Sheet Pile Wall on Steady Time and Quantity of Seepage
The saturated hydraulic conductivity was determined in laboratory with a permeameter under constant hydraulic head and applying the Darcy law.
EVALUACION DE LA ECUACION DE INFILTRACION DE GREEN Y AMPT EN ALGUNOS SUELOS AGRICOLAS DE MEXICO, USANDO INFORMACION DEL USDA Y UN METODO MODIFICADO DE BROOKS Y COREY
It is inferred that the Bahadur Khel Salts being in the North is the recharge zone and the hydraulic head gradient direction is N-NW for this specific area, have contaminated aquifers to varying degrees which is the cause of the saline underground water in the northern side of Waligai area which is in vicinity of Nala Kasho.
TWO GROUNDWATER SCENARIOS: A CASE STUDY FROM WALIGAI REGION BANNU DEPRESSION PAKISTAN
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