"Why diffuser is used"?

Answer 1

it spreads things so you don't get harsh edges.
with a cooking flame...so food doesn't burn to the bottom of the pot in a ring
with light ....so models don't harsh lines and shadows

Answer 2

A diffuser in thermodynamics is the mechanical device that is designed to control the characteristics of a fluid at the entrance to a thermodynamic open system. When the diffuser compresses, this causes the velocity to decrease. In other words, when the diffuser is put to work, the velocity of the fluid in the system decreases.

Diffusers usually work with nozzles in controlling fluid flow. Flow through nozzles and diffusers may or may not be assumed to be adiabatic. Frictional effects may sometimes be important, but usually they are neglected. However, the external work transfer is always assumed to be zero. It is also assumed that changes in thermal energy are significantly greater than changes in potential energy and therefore the later can usually be neglected for the purpose of analysis.
A diffuser is a device fitted over an underwater breathing set's blowoff hole to break up the resulting bubbles very small so they will not be seen from out of the water.They are mostly needed in frogman-type diving operations where secrecy is needed, and in marine biology to avoid scaring fish which are being studied. Designing an adequate diffuser on a rebreather is much easier than on open-circuit scuba.

A flash diffuser diffuses / spreads the light from the flash. In effect, the light will not come from one concentrated source (like a spotlight), but rather will spread out, getting rid of harsh light, and hard shadows. This is particularly useful for portrait photographers, since harsh light, and hard shadows are not flattering in a portrait!There are many commercial products which claim to spread the light most evenly, but in fact you can make a flash diffuser from a milk jug for free - here's an article describing it - make a free flash diffuser

Answer 3

A diffuser in thermodynamics is the mechanical device that is designed to control the characteristics of a fluid at the entrance to a thermodynamic open system. When the diffuser compresses, this causes the velocity to decrease. In other words, when the diffuser is put to work, the velocity of the fluid in the system decreases. Diffusers usually work with nozzles in controlling fluid flow. Flow through nozzles and diffusers may or may not be assumed to be adiabatic. Frictional effects may sometimes be important, but usually they are neglected. However, the external work transfer is always assumed to be zero. It is also assumed that changes in thermal energy are significantly greater than changes in potential energy and therefore the later can usually be neglected for the purpose of analysis.


application in car:

A diffuser allows the air traveling underneath the car a place to expand and decelerate back to road speed as well as providing wake infill. As the air enters towards the front of the car it accelerates and reduces pressure. There is a second suction peak at the transition of the flat bottom and diffuser. The diffuser then eases this "high velocity" air back to normal velocity and also helps fill in the area behind the race car making the whole underbody a more efficient downforce producing device by reducing drag and increasing downforce.

Understand that a true flat bottomed car (one without a diffuser) will produce downforce in and of itself when run in rake. Essentially the entire flat bottom becomes one large diffuser. It too has two suction peaks, one upon entrance, the second at the trailing edge of the flat undertray. A diffuser acts to enhance this underside suction, it acts like a pump, encouraging better flow under the car.

One thing to note is that the rear wing interacts with the diffuser "driving" it. The proximity of the low pressure side of the rear wing encourages better flow through for the underbody.


IN wind tunnel:

The diffuser is the gradually-expanding passage following the test section in which the flow speed decreases and the pressure rises. The recovery of pressure from kinetic energy reduces the power needed to drive the tunnel: in the case of open-circuit tunnels the diffuser also reduces drafts in the laboratory. The pressure rise is less than that given by Bernoulli's equation, because of losses due to skin friction and resulting growth of boundary-layer displacement thickness.

Answer 4

A diffuser is used in a centrifugal pump to increase pump efficiency. The impeller rotates at a very high speed and discharges fluid at high velocity (high kinetic energy) which must be converted to high pressure and low velocity (by converting the kinetic energy to potential energy of pressure). The diffuser permits the water flow area to expand gradually avoiding turbulence that would waste energy due to friction while heating the water. Reducing turbulence reduces the power required to pump the water.

Answer 5

If you are referring to a diffuser, as in how it is used on a car, here is how:

A diffuser acts in two ways: first, it acts as a kind of inverted wing, creating an area of low pressure underneath it. This pulls the rear of the car down to the ground. Additionally, the low-pressure area helps scavenge, or pull, the air from underneath the rest of the car. again, this creates a low-pressure area, which helps to pull he rest of the car down towards the ground. So, the short answer is: it creates downforce.

Answer 6

THE DIFFUSER IS USED TO DIFFUSE THE ITEM SAY BOMB ETC.

Answer 7

to evenly spread (air, noise, etc)