Abstract
This paper presents a quite simple, fully automatized single droplet generator, which can be an alternative for more expensive and complicated microfluidic devices. The simple generation nozzle connected to the pressure cells and cheap peristaltic pumps, synchronized via developed software with simple GUI (graphical user interface) implemented into the Raspberry Pi microcomputer allows precise control over the single droplet diameter and detachment frequency. The generator allows the formation of droplets of quite wide range of diameters without the need of orifice diameter replacements. Free control over time available for adsorption of surface active-substances over the surface of immobilized droplet, before its detachment from the orifice, is an advantage of the developed device.
Highlights
The behavior of droplets dispersed in the liquid phase has great importance in many diverse industrial and technological applications, such as extraction of liquid-liquid mixtures or emulsions formation, waste-water treatment or hydrometallurgy
Efficiency of many of these applications can be investigated and partially predicted on the basis of results of fundamental studies related to the hydrodynamics of single droplets in a liquid phase
For proper experimental investigations of rising droplet hydrodynamics as well as collisions between droplets and formation of single emulsion films under dynamic conditions, control over the formation of a single droplet with the desired diameter and detachment frequency is of crucial importance
Summary
The behavior of droplets dispersed in the liquid phase has great importance in many diverse industrial and technological applications, such as extraction of liquid-liquid mixtures or emulsions formation, waste-water treatment or hydrometallurgy. Microfluidic devices, for which fabrication and modification has been extensively studied and described [1,2,3,4,5,6], are the most widely used for single droplet generation in a liquid phase. In such devices two immiscible liquids are pumped through microchannels, where one phase is dispersed in the other. The undoubted advantage of microfluidic devices (called microchips) is their ability to generate single droplets with micrometer size. We havTehde epvaepleorpperdesaenqtusitaensailmteprnlea,tifvuellmy aetuhtoodmoalotigcysoinf gsilnegdlerodprloeptlgeet ngernaetroart,ioanlloinwtihneglipqrueicdispehcaosne.trol ovWere thhaevesidnegvleelodpreodpaleqtuditieamsimetpelre,afnudllydaeutatocmhmateicnstinfrgelqeudernopcyle.t gOeunrerautotro,malalotiwzeindg gperenceirsaetcoornatrlolol ws foormveartitohneosfindgrolepldertsopinleqt uditiaemweitdeer raanndgedoeftadcihamentetrsfrweqiuthenvceyr.y Ogouordapurtoecmisaitoiznewd itgheonuetranteoerdaollfoowrsifice difaomrmetaetriornepolfacdermopelnets.iMn qoureitoevweri,dteheratinmgee oafvadiilaambleeteforsr waditshorvpetriyongoof dsuprrfeaciesiaocntivwei-tshuobusttanneecdesoofver thoeriimficme odbiialimzeedtedr rroepplleatc,ebmefeonrtes.itsMdoerteaocvhemr,enthtefrotimmethaevoariilfiabcele, cfaonr baedpsorercpitsieolny aonf dsuearfsailcye caocnttivroel-led, assuwbesltlanascetshoevderetghreeeimomf oabdisliozrepdtidornopcloevt,ebreafgoereaitslidqeutaidch/lmiqeunitdfrionmterthfaecoer.ifiTche,iscafneabteuprereicsisiemlypaonrdtant esepaesciliyalclyonftorrolilnevde, satsigwaetliloansstohfesdteagbrielietyofoafdssinorgpletioenmcuolvseiorangfielamt sliqfouridm/leidquuidndinetrerdfyacnea.mThiciscfoenadtuirtieons (kiisneimticpsoortfadnrtoepspleetcicaolalylefsocreinncvee)s.tigations of stability of single emulsion films formed under dynamic conditions (kinetics of droplet coalescence)
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