Droplet size distribution measured during CEHDA; (a) Qi=7.5×10−10 m3 s−1, Qo=1×10−10 m3 s−1 and V=5.5 kV, (b) Qi=7.5×10−10 m3 s−1, Qo=1×10−10 m3 s−1 and V=6.5 kV, (c) Qi=7.5×10−10 m3 s−1, Qo=0.75×10−10 m3 s−1 and V=5.5 kV, (d) Qi=9×10−10 m3 s−1, Qo=1×10−10 m3 s−1 and V=6.0 kV and (e) Qi=9×10−10 m3 s−1, Qo=1.5×10−10 m3 s−1 and V=7 kV. Q and V denote flow rate and applied potential difference, respectively. i and o indicates inner and outer, respectively.