these w k values at each resistivity level this is because w k is a direct indicator of the level of precipitator energization 3 since the w k ratio represents an enhancement of precipitator energization it is termed the 34 enhancement factor 34 h table ii shows the effective w k for each operating mode and the enhancement factors at each resistivity level __________________________________________________________________________mode of temp resistivity precipitation w sub k enhancementoperation degrees k ohm cm efficiency m sec factor__________________________________________________________________________conventional 96 55 295 367 2 5 u00d7 10 sup 11 1 33pulsed 98 20 392conventional 81 80 0993 422 5 10 sup 12 2 53pulsed 95 22 251__________________________________________________________________________ because of the large number of individual runs involved in table i and their good reproducibility in each mode of operation it is felt that the values of the enhancement factor and their difference at the two resistivity levels have very significant meaning the fact that the level of enhancement of w k increases as resistivity increases supports the previously described concept of the effect of pulsed energization the poorer the conventional energization the greater degree of improvement possible by pulsing it should be noted however that although the enhancement factor increases with resistivity the value of w k for both conventional and pulsed energization decreases this shows that pulse energized precipitation as well as conventional is subject to resistivity caused limitations although the limitation to the pulsed performance is much less severe this is reasonable based on theory because no matter how precipitator energization is achieved dielectric breakdown of the dust layer will preclude further useful energization with pulsed energization however greater and more uniform ion densities and higher effective field strengths exist when this limit is reached it was.