Lift force behavior on single bubbles in bubble column with three different sodium chloride concentrations

BELLADONNA PARAMAYSWARI, Prof. Dr. Ir. Indarto, DEA

2018 | Skripsi | S1 TEKNIK MESIN

Lift force is one most important forces that strongly influence the single bubble behavior. On the other hand, the presence of a small amount of surfactant may also cause considerable changes of the bubble rise behavior and therefore the entire flow structure. Lift coefficient, CL, of single bubbles in linear shear flows are investigated to carry out the effects of sodium chloride (0.2 and 0.4 mol/l concentration) on single bubbles. The experimental facility used in the present work is a rectangular Plexiglas® bubble column and several sparger sizes were used to generate both single and driving bubbles. One bubble size was measured in three measurement series. Each series consists of 30 recordings, which was five minutes long per recording. The techniques used for this work are the particle shadow image velocimetry (PSIV) and bubble shadowgraphy. The software used for these techniques is an in-house developed software based on the programming language Java™. The results reveal that the effects of sodium chloride for 0.2 and 0.4 mol/l concentrations on single bubbles are not strong enough and no major changes could be observed.

Lift force is one most important forces that strongly influence the single bubble behavior. On the other hand, the presence of a small amount of surfactant may also cause considerable changes of the bubble rise behavior and therefore the entire flow structure. Lift coefficient, CL, of single bubbles in linear shear flows are investigated to carry out the effects of sodium chloride (0.2 and 0.4 mol/l concentration) on single bubbles. The experimental facility used in the present work is a rectangular Plexiglas® bubble column and several sparger sizes were used to generate both single and driving bubbles. One bubble size was measured in three measurement series. Each series consists of 30 recordings, which was five minutes long per recording. The techniques used for this work are the particle shadow image velocimetry (PSIV) and bubble shadowgraphy. The software used for these techniques is an in-house developed software based on the programming language Java™. The results reveal that the effects of sodium chloride for 0.2 and 0.4 mol/l concentrations on single bubbles are not strong enough and no major changes could be observed.

Kata Kunci : bubbly flows, single bubble, lift coefficient, surfactant, sodium chloride