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Dyson Announces Blade-less Fan, Explains Principle The Dyson Air Multiplier looks like a cylindrical column topped with a ring. At the first glance, I thought it has no fan. The cross-section of the ring looks like an aircraft wing. The body without the ring The cross-section of the body. The gray part at the bottom is the fan whose blades are positioned at irregular intervals. The simulation of the airflow near the ring The analysis of the flow velocity. Airflow is locally concentrated near the ring. Dyson and "fervent buyer" Shigeki Hosokawa The electric fan looks like a cylindrical column topped with a ring. At the first glance, I thought it has no fan. But there actually is a fan inside its body. The Air Multiplier uses the fan to blow air into the ring, which is hollow inside. Then, the air comes from a narrow opening of the ring. Finally, 15 times as much air as is sent by the fan can be blown from a large area because of a viscous shear flow. "When exami

Stop Global Warming Here are 10 simple things you can do to stop or prevent global warming. Change a light  : Replace regular bulbs with compact fluorescent light (CFL) bulbs. They consume less power then ordinary bulbs and have longer lifetime. Some countries have completely banned the usage of ordinary bulbs and force the common public to use CFL bulbs. Drive less  : By driving less you are not only saving fuel but also helping in reducing global warming. Also, look out for other possibilities, for eg: car pooling. If you have colleagues who live in the same area then you can combine trips. If you need to go to a local market then either walk or go by cycle. Both of them are great form of exercise. Recycle more  : Try to use the disposable products into some other form. Just don't throw them away. You can recycle almost anything for eg: paper, aluminum foils, cans, newspapers. By recycling you can help in reducing landfills . Check your tyres  : When you drive make sure your tyre

Static electricity                  Static electricity is the buildup of electrical charges on the surface of non-conducting materials. It is called “static” because, unlike a home’s electrical system, static electricity has almost no current. Static typically forms when two materials come into contact, and some of the charges redistribute by moving from one material to the other. This leaves a net positive charge on one material and an equal negative charge on the other, both of which will remain if the two materials separate. If the net charges grow faster than a material can dissipate them, an electrostatic charge builds up. The excess charge can suddenly neutralize by a flow of charges to the surroundings, known as an electrostatic discharge or static spark. By super-heating the surrounding air and causing it to rapidly expand, the discharge is both visible and audible. Interesting Facts About Static Electricity Ordinary household static can have voltages many times greater than th