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Explaining the Dyson Air Multiplier Fan - How it Works

written by: Asheesh • edited by: Lamar Stonecypher • updated: 6/24/2010

Are you wondering how a fan can supply air flow without blades? It is made possible by Mr. Dyson; he used the technology of aircraft wings and introduced a new fan that doesn't need exposed blades. Here we describe the theory of operation of this amazing fan.

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    Dyson developed a fan that doesn’t need any blade to make a speedy flow of air. This technology has many benefits, and the fan can be used very easily. The fan appears very attractive, and the principle of operation is also very simple. This is the first fan that can flow air very smoothly without using exposed blades.

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    Appearance of the Fan

    The ring type structure of this fan is attractive. The upper part of the fan is the ring, shown in the image in blue, although it is available in different colors. The lower part of the fan is cylindrical and has a variable speed control switch on it. This switch is placed at the front and is used to change the speed of the fan. Two other switches placed at both sides work for on and off. Just above the switches small holes are provided around the cylindrical structure. These work as air inlets and have much importance in the operation of the fan.

    Appearence of The Fan  

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    Operation of the Fan

    The bladeless ring works in a manner similar to aircraft wings. Actually, the fan does have blades; they are provided in the base of the fan. The air comes in towards a circular structure called a mixed flow impeller inside the cylindrical structure. The mixed flow impeller is actually an air pump, and it is used for blowing air upwards to the ring. Impeller placement is critical. If placed correctly, it can develop a significant negative pressure effect to get the air flow going.

    Working of the Fan  

    When the air reaches the ring, it creates a negative pressure above the joint of the ring and cylinder. This negative pressure forces the air that is present over the back side of the ring forward. Further, this creates a negative pressure at the back side of the ring, and due to this, air starts flowing from back to front, in what is called the Coanda effect. The air flows forward in a circular cross section. The air around the flow also starts moving due to viscous shearing, and the speed of the flow becomes sixteen times larger than that of any ordinary fan.

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    This fan introduces many advantages compared to ordinary fans, some of which are given below.

    Safe for Children

    This fan needs no exposed blades to provide air flow. Due to this, this fan is safe for children.

    Easy to cleanCleaning Fan  

    The structure of this fan is very simple, and because of this it’s very easy to clean.

    Switch for Variable Speed

    In an ordinary fan, three to five switch positions are used to change the speed of the fan. The Dyson requires only one switch to reach the desired speed.

    Oscillation of the Fan Oscillation of Fan  

    Almost every fan has the quality of oscillating horizontally. However, this fan can flow the air upward and downward by oscillating its bottom vertically. It is because the center of gravity of this fan is very distant from the base.

    Smooth Air

    The air coming from an ordinary fan is not so smooth. It forces the air, by using blades, in the form of turbulent air slaps, which makes the air flow rougher. The Dyson fan is capable of flowing air very smoothly due to the absence of blades.

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    The Dyson Air Multiplier fan is a gift of engineering with many advantages. Although the price of this fan is comparatively high, this fan provides lots of benefits to overcome this disadvantage. Mr. Dyson is famous for his vacuum cleaners, and this fan is the new product of his company.

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    Image: michael.aulia- Oscillation of Fan

    Image: michael.aulia- Cleaning Fan

    Image: - michael.aulia- Appearence of the Fan

    Image: Working of The Fan