Document Type : Full length
Sahand University of Technology
Most industrial operating units are basically in contact with two gas and liquid phases. Bubble characteristics over the last years have been determined through different methods. In this project a mass transfer system has been designed for absorbing gas bubbles by liquid phase. The mass transfer and hydrodynamic behavior in the wake of single rising air bubbles were investigated by using an image analysis method and empirical relations. By considering these methods, the overall bubble properties including the size of single bubble, shape, path, rising velocity and mass transfer coefficient were studied and measured. The investigation was developed with 0.15×0.15×0.35 m3 bubble column and nozzle diameter (0.5, 1, 1.5, 2, 2.5 mm) in different liquids considering viscose changes. Moreover, from the results obtained, it can be concluded that the increase of nozzle diameter increases the bubble diameter which results in reduction of velocity and mass transfer coefficient. This is a fact that, by raising the viscosity of liquid phase the bubble diameter stands at the highest level and on the contrary velocity and mass transfer coefficient stand at the lowest level. So according to these outcomes we can conclude that, the diameter of bubble depends on physical properties of fluids and has a direct relation with nozzle diameter.
- Yoo, Y., Ga, S., Kim, J. and Cho, H., “Method for measuring bubble size under low-light conditions for mass transfer enhancement in industrial-scale systems”, Commun. Heat Mass Transf., 140 (November 2022), 106525 (2023). (https://doi.org/10.1016/j.icheatmasstransfer.2022.106525).
- Akita, K. and Yoshida, F., “Gas holdup and volumetric mass transfer coefficient in bubble columns. Effects of liquid properties”, Eng. Chem. Process Des. Dev., 12 (1), 76 (1973).
- Sherwood, T. K., Pigford, R. L. and Wilke, C. R., Mass transfer, McGraw-Hill, New York, (1975).
- Motarjemi, M. and Jameson, G. J., “Mass transfer from very small bubbles—the optimum bubble size for aeration”, Eng. Sci., 33 (11), 1415 (1978).
- Dani, A., Guiraud, P. and Cockx, A., “Local measurement of oxygen transfer around a single bubble by planar laser-induced fluorescence”, Eng. Sci., 62 (24), 7245 (2007).
- Stöhr, M., Schanze, J. and Khalili, A., “Visualization of gas–liquid mass transfer and wake structure of rising bubbles using pH-sensitive PLIF”, Fluids, 47, 135 (2009).
- Francois, J., Dietrich, N., Guiraud, P. and Cockx, A., “Direct measurement of mass transfer around a single bubble by micro-PLIFI”, Eng. Sci., 66 (14), 3328 (2011).
- Jimenez, M., Dietrich, N., Cockx, A. and Hébrard, G., “Experimental study of O2 diffusion coefficient measurement at a planar gas–liquid interface by planar laser‐induced fluorescence with inhibition”, AIChE J., 59 (1), 325 (2013).
- Kováts, P., Thévenin, D. and Zähringer, K., “Characterizing fluid dynamics in a bubble column aimed for the determination of reactive mass transfer”, Heat Mass Transf., 54, 453 (2018).
- Taghavi, M. and Moghaddas, J. S., “Using PLIF/PIV techniques to investigate the reactive mixing in stirred tank reactors with Rushton and pitched blade turbines”, Eng. Res. Des., 151, 190 (2019).
- Higbie, R., “The rate of absorption of a pure gas into a still liquid during short periods of exposure”, AIChE, 31, 365 (1935).
- Frossling, N., “The evaporation of falling drops”, Gerlands Beitr. Geophys., 52, 170 (1938).
- Nock, W. J., “An investigation into gas transfer from bubbles into water”, University of Southampton, (2015).
- Kosari, E., Eshrgahi, J., Ahmed, W. H. and Hanafizadeh, P., “Experimental investigation of bubble growth and detachment in stagnant liquid column using image–based analysis”, Energy Equip. Syst., 7 (4), 353 (2019).
- Clift, R., Grace, J. R. and Weber, M. E., “Bubbles, drops, and particles: Courier”, Dover Publication, New York, (2005).
- Karimi, S., Abiri, A., Shafiee, M., Abbasi, H. and Ghadam, F., “New correlations for the prediction of terminal velocity and drag coefficient of a bubble rising”, J. Mech. Eng. Trans. ISME, 22 (2), 71 (2021).
- Brenn, G., Kolobaric, V. and Durst, F., “Shape oscillations and path transition of bubbles rising in a model bubble column”, Eng. Sci., 61 (12), 3795 (2006).
- Veldhuis, C., Biesheuvel, A. and Van Wijngaarden, L., “Shape oscillations on bubbles rising in clean and in tap water”, Fluids, 20 (4), 40705 (2008).
- Ern, P., Risso, F., Fabre, D. and Magnaudet, J., “Wake-induced oscillatory paths of bodies freely rising or falling in fluids”, Rev. Fluid Mech., 44, 97 (2012).
- Leonard, J. H. and Houghton, G., “Mass transfer and velocity of rise phenomena for single bubbles”, Eng. Sci., 18 (2), 133 (1963).
- Garbarini, G. R. and Tien, C., “Mass transfer from single gas bubble—A comparative study on experimental methods”, J. Chem. Eng., 47 (1), 35 (1969).
- Lochiel, A. C. and Calderbank, P. H., “Mass transfer in the continuous phase around axisymmetric bodies of revolution”, Eng. Sci., 19 (7), 471 (1964).
- Padding, J. T., Deen, N. G., Peters, E. F. and Kuipers, J. A. M. H., “Euler–Lagrange modeling of the hydrodynamics of dense multiphase flows”, in Advances in chemical engineering, 46, Elsevier, p. 137 (2015).