2019年4月26日 · Drip emitters regulate water flow by dissipating the flow energy through frictional resistance. Laminar flow emitters regulate water flow by dissipating energy via friction against the walls of long and narrow path. Microtubes and spiral path emitters are examples of laminar flow emission devices.

2009年5月1日 · The causes of clogging differ based on emitter dimension (Chigerwe et al., 2004, Ahmed et al., 2007) and positions in lateral (Ravina et al., 1997). de Kreij et al. (2003) found that the tube emitter system with laminar flow suffers more severe clogging than the labyrinth system with turbulent flow, because laminar flow is predisposed to clogging.

Microtubes and spiral path emitters are examples of laminar flow emission devices. Turbulent flow emitters regulate water flow by dissipating energy in friction against the walls of the water passage and also between the particles themselves during their turbulent movements.

2006年8月1日 · With the continuous progress of manufacturing technology, the emitters and lateral tubes are currently integrated to become the internally-mounted drip irrigation tubes. This commonly-used tube-molding technology helps the tubes to possess the functions of both water allocating and water dripping by embedding emitters into the tubes.

Various types of anti-clogging emitter designs such as tube emitter system with laminar flow [22-23], labyrinth type emitter [21], and dripper having high flow [24] have also been...

2008年10月15日 · A novel micro-sprinkler system is proposed that uses microtube as the emitter and where the length of the microtube can be varied in response to pressure changes along the lateral to give uniformity of emitter discharges.

In laminar emitters (microtubes, spiral drippers) the water current moves slowly and regularly, flowing smoothly and at low speed. Laminar flow devices regulate water flow by dissipating energy by friction against the walls of the water conduit.

Emitters of various sizes may be placed along the lateral to meet pressure variations resulting from changes in elevation. In laminar flow emitters which include the long path, low discharge devices the relation between the discharge and the operating pressure is linear, i.e., doubling the pressure doubles the discharge.

With the goal of developing an irrigation system with ultra low flow rate (ULF) of 0.2 L h-1, using microtubes with derivation and operating in a laminar regime, this work began by seeking efficient irrigation and low costs. The experiment consisted of two stages.

2021年10月27日 · Emitter flow rate decreased with the increasing time of operation of the drip systems at normal operating pressure, because of clogging of emitters. By flushing operation, it was observed a 3...