While the general meaning of the word spray is widely known, most would struggle to give a more definitive explanation of the term. To illustrate what it really means, we can look at the spray that is produced when a deodorant can is used. The deodorant itself is stored as a liquid in the container, and emerges into the air as a mist. This familiar example ties in perfectly with how a spray is defined as drops of liquid distributed in a gas.
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.
Sprays are used extensively by companies producing foods and drinks. Spray washers are used to clean fruit and vegetables, while many flavorings and additives are sprayed onto foods. Sprays are very controllable, which helps manufacturers to ensure the correct amount of ingredient is added, for example a little too much spice will make food inedible for some people, so reasonable precision is required. Another advantage of sprays is that they can help ensure a uniform distribution of ingredient is applied over a food product.
Another huge application for sprays within the food and drinks industry involves the process of spray drying. This is the technique used for creating such ubiquitous products as instant coffee, powdered milk, spices, colorings and many others. Because spraying turns a liquid into many tiny particles, these can be dried very quickly in warm air.
While spray drying is perhaps not familiar to the lay person, spray painting is far more widely known. As well as the mundane spray paint can known to all, there are other more advanced forms of spray painting. An interesting variation is electrostatic spray painting, where the paint spray is given an electric charge, and the item to be painted is given an opposite charge so that it will attract the paint. This has clear advantages over brush painting, where it can be very hard to paint into awkward areas.
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.
Sprays are used extensively by companies producing foods and drinks. Spray washers are used to clean fruit and vegetables, while many flavorings and additives are sprayed onto foods. Sprays are very controllable, which helps manufacturers to ensure the correct amount of ingredient is added, for example a little too much spice will make food inedible for some people, so reasonable precision is required. Another advantage of sprays is that they can help ensure a uniform distribution of ingredient is applied over a food product.
Another huge application for sprays within the food and drinks industry involves the process of spray drying. This is the technique used for creating such ubiquitous products as instant coffee, powdered milk, spices, colorings and many others. Because spraying turns a liquid into many tiny particles, these can be dried very quickly in warm air.
While spray drying is perhaps not familiar to the lay person, spray painting is far more widely known. As well as the mundane spray paint can known to all, there are other more advanced forms of spray painting. An interesting variation is electrostatic spray painting, where the paint spray is given an electric charge, and the item to be painted is given an opposite charge so that it will attract the paint. This has clear advantages over brush painting, where it can be very hard to paint into awkward areas.
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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