Original scientific paper

Heat Transfer in Bubble Columns

Bekir Zühtü UYSAL ; Gazi University, Faculty of Engineering, Department of Chemical Engineering and Clean Energy Research and Application Center, Maltepe, Ankara, Turkey
Özkan Murat DOĞAN ; Gazi University, Faculty of Engineering, Department of Chemical Engineering and Clean Energy Research and Application Center, Maltepe, Ankara, Turkey
Duygu UYSAL ; Gazi University, Faculty of Engineering, Department of Chemical Engineering and Clean Energy Research and Application Center, Maltepe, Ankara, Turkey
Serdar DEMIR ; Gazi University, Faculty of Engineering, Department of Chemical Engineering and Clean Energy Research and Application Center, Maltepe, Ankara, Turkey

Abstract

Bubble columns are gas-liquid contactors often used in industry. Although
they are used primarily for mass transfer purpose, since gas and liquid
phases are fed to the column at different temperatures, direct contact
heat transfer becomes important as well. This research is about the heat
transfer characteristics of bubble columns. Experiments were carried out
using a plexiglass column with dimensions 160x160x1180 mm. Water was
first put into the column to the height of 1 m and heated to the desired
temperature, and then experiments were performed by introducing ambient
air to the column and recording the variation in temperature of water and
inlet and outlet air temperatures and humidities. Models developed for the
convective heat transfer from the liquid interface to the gas in the bubble
were used together with the experimental data to determine the heat and
mass transfer coefficients. The volumetric heat transfer coefficient (hGa)
was found to vary over the range 0,3-16 kW/(m3·K) with gas flow rate and
the volumetric mass transfer coefficient (kGa) in the range 0,35-7,49 kmol/
m3·s·atm.

Keywords

Bubble column; Heat transfer; Mass transfer

Hrčak ID:

66565

URI

https://hrcak.srce.hr/66565

Publication date:

29.10.2010.

Article data in other languages: croatian

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