An aerosol creation system, comprising: a pair of counter-rotating rollers (102, 104, 202, 204, 602, 604, 702, 704, 1002, 1004, 1102, 1104, 1202, 1204, 1302, 1304) comprising a first roller (102, 202, 602, 702, 1002, 1102, 1202, 1302) and a second roller (104, 204, 604, 704, 1004, 1104, 1204, 1304), the counter-rotating rollers being configured to be positioned adjacent each other and define a nip between each other, the nip having an upstream side and a downstream side; a fluid source configured to provide a fluid to the upstream side of the nip; a driving element configured to drive the pair of counter-rotating rollers to rotate in counter rotation with respect to each other and cause the fluid to be drawn through the upstream side of the nip to the downstream side of the nip and leave the downstream side of the nip as filaments that will break up into droplets; and a collection shell (210, 610, 710, 810, 910, 1110, 1310) configured to be positioned substantially around the pair of counter-rotating rollers, the collection shell having a nozzle (112, 212, 312, 422, 532, 612, 712, 1012, 1112, 1212, 1312) configured to allow passage of the spray from the downstream side of the nip, wherein the collection shell has a converging profile designed to collect the spray efficiently along its natural direction and to guide the spray into and through the nozzle, and characterized in that the system further comprises a pair of air knives (114, 116, 214, 216, 614, 616, 814, 816, 914, 916, 1014, 1016, 1114, 1116, 1214, 1216, 1314, 1316) including a first air knife and a second air knife and configured to create an air flow in a chamber that is substantially defined between an inner surface of the collection shell and the pair of counter-rotating rollers (102, 104, 202, 204, 602, 604, 702, 704, 1002, 1004, 1102, 1104, 1202, 1204, 1302, 1304), wherein the air flow carries the droplets out through the nozzle (112, 212, 312, 422, 532, 612, 712, 1012, 1112, 1212, 1312), wherein the air flow is provided at the downstream side of the nip, wherein the first air knife generates a first stream of air that is substantially tangential to both a first portion of an inner surface of the collection shell and a first circle that is concentric to the first roller, and further wherein the second air knife generates a second stream of air that is substantially tangential to both a second portion of the inner surface of the collection shell and a second circle that is concentric to the second roller, the first and second streams of air being substantially counter to each other. a pair of counter-rotating rollers (102, 104, 202, 204, 602, 604, 702, 704, 1002, 1004, 1102, 1104, 1202, 1204, 1302, 1304) comprising a first roller (102, 202, 602, 702, 1002, 1102, 1202, 1302) and a second roller (104, 204, 604, 704, 1004, 1104, 1204, 1304), the counter-rotating rollers being configured to be positioned adjacent each other and define a nip between each other, the nip having an upstream side and a downstream side; a fluid source configured to provide a fluid to the upstream side of the nip; a driving element configured to drive the pair of counter-rotating rollers to rotate in counter rotation with respect to each other and cause the fluid to be drawn through the upstream side of the nip to the downstream side of the nip and leave the downstream side of the nip as filaments that will break up into droplets; and a collection shell (210, 610, 710, 810, 910, 1110, 1310) configured to be positioned substantially around the pair of counter-rotating rollers, the collection shell having a nozzle (112, 212, 312, 422, 532, 612, 712, 1012, 1112, 1212, 1312) configured to allow passage of the spray from the downstream side of the nip, wherein the collection shell has a converging profile designed to collect the spray efficiently along its natural direction and to guide the spray into and through the nozzle, and characterized in that the system further comprises a pair of air knives (114, 116, 214, 216, 614, 616, 814, 816, 914, 916, 1014, 1016, 1114, 1116, 1214, 1216, 1314, 1316) including a first air knife and a second air knife and configured to create an air flow in a chamber that is substantially defined between an inner surface of the collection shell and the pair of counter-rotating rollers (102, 104, 202, 204, 602, 604, 702, 704, 1002, 1004, 1102, 1104, 1202, 1204, 1302, 1304), wherein the air flow carries the droplets out through the nozzle (112, 212, 312, 422, 532, 612, 712, 1012, 1112, 1212, 1312), wherein the air flow is provided at the downstream side of the nip, wherein the first air knife generates a first stream of air that is substantially tangential to both a first portion of an inner surface of the collection shell and a first circle that is concentric to the first roller, and further wherein the second air knife generates a second stream of air that is substantially tangential to both a second portion of the inner surface of the collection shell and a second circle that is concentric to the second roller, the first and second streams of air being substantially counter to each other.