spray flow

Spray flow

A special case of a two-phase (gas and liquid) flow in which the liquid phase is the dispersed phase and exists in the form of many droplets. The gas phase is the continuous phase, so abstract continuous lines (or surfaces) can be constructed through the gas at any instant without intersection of the droplets. The droplets and the gas have velocities that can be different, so both phases can move through some fixed volume or chamber and the droplets can move relative to the surrounding gas.

Spray flows have many applications. Sprays are used to introduce liquid fuel into the combustion chambers of diesel engines, turbojet engines, liquid-propellant rocket engines, and oil-burning furnaces. They are used in agricultural and household applications of insecticides and pesticides, for materials and chemicals processing, for fire extinguishing, for cooling in heat exchangers, for application of medicines, and for application of coatings (including paint and various other types of layered coatings). Common liquids (such as water, fuels, and paints) are used in sprays. It is sometimes useful to spray uncommon liquids such as molten metals. In the various applications, the approximately spherical droplets typically have submillimeter diameters that can be as small as a few micrometers.

Sprays are formed for industrial, commercial, agricultural, and power generation purposes by injection of a liquid stream into a gaseous environment. In addition, sprays can form naturally in a falling or splashing liquid. Injected streams of liquid tend to become unstable when the dynamic pressure (one-half of the gas density times the square of the liquid velocity) is much larger than the coefficient of surface tension divided by the transverse dimension. Typically, the liquid stream disintegrates into ligaments (coarse droplets) and then into many smaller spherical droplets. The breakup (or atomization) process is faster at higher stream velocity, and the final droplet sizes are smaller for higher stream velocities. Spray droplet sizes vary and typically are represented statistically by a distribution function. The number of droplets in a spray can be as high as a few million in a volume smaller than a liter. See Jet flow

spray flow

[′sprā ‚flō]
(fluid mechanics)
A two-phase flow in which the liquid phase is the dispersed phase and exists in the form of many droplets, while the gas phase is the continuous phase.
References in periodicals archive ?
As a completely new benefit, Apellix also stores all project data such as surface temperature, highly accurate locational position information, test results or paint spray flow rates, and even localized hydrocarbon levels in its cloud-based repository.
They have modeled the gas mixture and spray flow in the multicompartment system.
For our system, we have found that fine atomization with no blowing off the already deposited droplets were attained using a combination of a relatively low pressure (~1 bar) and a spray flow rate ~ 70 [micro]L/sec.
Under the assumptions that the spray distance H, the spray flow [q.sub.v], and the cone angle [phi] are constant when the spray gun is still sprayed, a mathematical model is used to describe the distribution of spray coating on a flat plate.
The second approach, i.e., solid film formation through drying of a liquid film, may be privileged if the process conditions, such as the spray flow rate, substrate speed, and temperature are tuned so that in one or two spray passes the desired thin solid film forms without additional spray passes required to cover up the holes and defects left behind from the earlier passes.
It is considered that the injector produces the droplets with higher diameter than the injector in first state, there are two reasons for it, first, it reduces the spray flow and thus reduces the Reynolds number and second, it reduces the pressure loss behind the injector than the first state.
The adjustable conditions in this work are the moving speed of the conveyor belt, the spray flow rate, and the spray distance.
The sprayer was equipped with six hollow cone nozzles (TeeJet TXA8001Vk orange) operating with a pressure drop of 8.0 bar, to give total spray flow rates of 4.2 1 [min.sup.-1].
Low pressure water or a nozzle that has a rinse or spray flow is best, depending on what type of washer your unit uses.
The rotomolding trials were carried out on a carousel rotational molding machine (Rotospeed RS2-160), and the technical specifications were as follows: maximum oven fan capacity of 6.14 [m.sup.3]/s (13,000 cfm), maximum cooling forced air fan capacity of 3.78 [m.sup.3]/s (8000 cfm), maximum cooling exhaust fan capacity of 2,93 [m.sup.3]/s (6200 cfm), and water spray flow rate could be set at three different levels with a maximum of 17 1/min.