You are planning to use the blend for a CI engine or an SI engine?

Before going for atomization, I would advise evaluation of the fluid properties of the blend vis-a-vis homogeneity (miscibility), viscosity, density, surface tension etc., since these properties decide mechanism of creating fine droplets (atomizing).

Diesel has higher cetane number, while gasoline has higher octane number. Diesel is less volatile, while gasoline is highly voltatile fuel. Hence blending is of no use. They are not mixible. Solubility tests are to be performed. Better method is to use two injectors so that they inject the fuel in normal conventional manner. 

@ Dr. Maddali: What would be the mode of combustion even when diesel and gasoline are injected separately?

Do you propose using a diesel injector inside the combustion chamber (for injection at end of compression stroke) and a separate injection system for gasoline either through Manifold or throttle body (injection along with aspirated air)?

There have been attempts on using premixed LPG-Air used as charge for diesel engines.

If you want to use a 80/20 diesel-gazoline blend in a Diesel engine the main problem could be cavitation in some parts of the injection system but it is not always the case. Be sure pressure is always high enough everywhere.

For the cetane number of the blend : of course it is lower but it works.

If you want to put this blend in admission use an air assisted injection nozzle. It is simple to manufacture but requires experiments for optimisation (in open air). For exemple you make a sort of venturi with inlet of fuel at a point after it or inside it. The best is a sonic Venturi and liquid injection in the point where there is a breaking of the sonic flow. With such a system it is easy to control fuel flow.

THANK YOU VERY MUCH