head loss

(redirected from Hydraulic head)
Also found in: Wikipedia.

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.

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.
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.
According to Bear [52], for flow in a saturated porous medium, the equation of mass conservation expressed in terms of hydraulic head is
Tenders are invited for Supply Of Cat A Fips Spares : P End Jain, Parts Set Of Seals, Hydraulic Head, Cross Disc, Repair Kit For Feed Pump, Pump Element(Plunger With Sleeve), Delivery Valve, Nozzle 1465, P E Pump Component Kit (Rsv Gov), Starting Spring, Solenoid, Solenoid Switch
Tenders are invited for Hydraulic Head Pallet Trolley, Capacity 2500 Kga 2.5 Approx Fork Span 550Mm, Fork Length 1150Mm, For Max/Min Height 200/80Mm, Steering Wheel 180X50, Load Roller 74X70, Fork 160X60mm, Make-Godrej, Forza, Jost, Swift, Techman, Nilkamal Or Equal.
Screw plug hydraulic head hydraulic head hydraulic head
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.
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.
The hydraulic head variation in the pumped layer has a significant effect on the process of land subsidence.
The saturated hydraulic conductivity was determined in laboratory with a permeameter under constant hydraulic head and applying the Darcy law.
where [v.sub.x], [v.sub.y], and [v.sub.z] are the conductivity velocity of rock mass in X, Y, and Z directions; [rho] is the water density; [alpha] is the compression coefficient of rock mass; a is the compression coefficient of water; n is the porosity ratio of rock mass; h is the hydraulic head; t is time.
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.