Although most people are familiar with the idea of a spray, it is perhaps less well understood exactly what a spray is. The definition of a spray is a collection of droplets dispersed in a gas. When someone sprays, for example, an aerosol can of deodorant, liquid stored inside the can is scattered as a cloud of fine drops in the air. It can be seen how this fits together with the definition of a spray.
In the above example, the air was the gas that that the drops of deodorant were dispersed in. However, the definition of a spray allows for liquid to be sprayed into any gas, for example when various liquids are sprayed into the emissions of power plants, to help strip out harmful chemicals.
The name given to the act of turning a liquid into a spray is atomization. Despite the implication, this does not mean that the fluid is actually dispersed as lone atoms, but instead simply as minute liquid globules. By looking at some of the many applications sprays have, some of the more useful properties will be revealed. Because of the great variety of functions for sprays, only a few notable cases will be looked at.
One area where spraying has great usefulness is in the food and drinks industry. As well as spray washing fresh produce, foods can be coated with flavorings, or any other additives, using a spray. In the case where a food requires a spicy coating, a spray allows the precise amount of this to be controlled. If spice mix was simply poured on, it could easily end up far too hot for many people. Also, sprays allow an even quantity to be distributed over the entire surface.
Spray drying is another important process in the manufacturing of edible products. Liquid foods and drinks are dried by spraying them into hot air, which evaporates the moisture and leaves a powder. This procedure is used to create additives like colorings and spices, as well as more common staples such as instant coffee or powdered milk.
A more common and well recognized use of sprays is that of spray painting, although there are more refined examples of this than the simple can of spray paint that immediately comes to mind. Whatever product has to be painted can be made to literally attract the paint, by using electrical charges. The product and the paint are charged oppositely, and this is called electrostatic spray painting. Using this technique can be advantageous where paint has to be applied into tight spots which a paintbrush cannot reach.
Perhaps the most important use of sprays is where they are used in engines. Fuel sprays inject the fuel into many types of engine, including petrol, diesel, jet and rocket engines, and also in steam boilers. The injection of fuel in this manner is highly significant, because turning it into a spray creates a very high surface area, while also dispersing it through the air, which allows it to be ignited very efficiently.
As can be seen, the familiar but poorly understood concept of the spray touches our lives in numerous and powerful ways, whether that is in the power stations that heat our homes, the food we eat, common products like deodorants and spray paint, or the vehicles that make our world run.
In the above example, the air was the gas that that the drops of deodorant were dispersed in. However, the definition of a spray allows for liquid to be sprayed into any gas, for example when various liquids are sprayed into the emissions of power plants, to help strip out harmful chemicals.
The name given to the act of turning a liquid into a spray is atomization. Despite the implication, this does not mean that the fluid is actually dispersed as lone atoms, but instead simply as minute liquid globules. By looking at some of the many applications sprays have, some of the more useful properties will be revealed. Because of the great variety of functions for sprays, only a few notable cases will be looked at.
One area where spraying has great usefulness is in the food and drinks industry. As well as spray washing fresh produce, foods can be coated with flavorings, or any other additives, using a spray. In the case where a food requires a spicy coating, a spray allows the precise amount of this to be controlled. If spice mix was simply poured on, it could easily end up far too hot for many people. Also, sprays allow an even quantity to be distributed over the entire surface.
Spray drying is another important process in the manufacturing of edible products. Liquid foods and drinks are dried by spraying them into hot air, which evaporates the moisture and leaves a powder. This procedure is used to create additives like colorings and spices, as well as more common staples such as instant coffee or powdered milk.
A more common and well recognized use of sprays is that of spray painting, although there are more refined examples of this than the simple can of spray paint that immediately comes to mind. Whatever product has to be painted can be made to literally attract the paint, by using electrical charges. The product and the paint are charged oppositely, and this is called electrostatic spray painting. Using this technique can be advantageous where paint has to be applied into tight spots which a paintbrush cannot reach.
Perhaps the most important use of sprays is where they are used in engines. Fuel sprays inject the fuel into many types of engine, including petrol, diesel, jet and rocket engines, and also in steam boilers. The injection of fuel in this manner is highly significant, because turning it into a spray creates a very high surface area, while also dispersing it through the air, which allows it to be ignited very efficiently.
As can be seen, the familiar but poorly understood concept of the spray touches our lives in numerous and powerful ways, whether that is in the power stations that heat our homes, the food we eat, common products like deodorants and spray paint, or the vehicles that make our world run.
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