The distance between the two neighboring electrodes in multipleneedle or wire configuration is also an important factor. The best configuration of the multi-needle electrode is with the needles spaced to produce impinging corona jets with circular areas almost touching eachother. If the neighboring wires are located too close, part of the coronawind generated by the adjacent wires would collide before reachingthe food surface. This fact would result in losing energy and decreasingthe drying rate. The situation would not be different if the neighboringwires were located in much higher distance, due to the fact that the corona wind could not reach all the surface. At an optimal distance between adjacent wires, the generated corona wind can meet each otheron the food surface without any energy losses. In other words, thefood surfaces could be completely covered by the corona wind, whichexhibits the fastest drying rate. The distance between needlepoint electrodes in multiple needle configurations could be determined by theWarburg's equation. This equation shows how the unipolar currentdensity in positive and negative point-to-plane coronas is distributedover the plane Eq