Mass transfer from single carbon dioxide bubbles in alcohol aqueous solutions in vertical pipes. (May 2017)

• Record Type: Journal Article
• Authors: Aoki, Jiro; Hori, Yohei; Hayashi, Kosuke; Hosokawa, Shigeo; Tomiyama, Akio
• Is Part Of: International journal of heat and mass transfer. Volume 108:Part B(2017)
• Page Start: 1991
• Page End: 2001
• Publication Date: 2017-05
• Subjects: Mass transfer -- Bubble -- Alcohol -- Carbon chain length; Heat -- Transmission -- Periodicals; Mass transfer -- Periodicals; Chaleur -- Transmission -- Périodiques; Transfert de masse -- Périodiques; Electronic journals; 621.4022
• DOI: 10.1016/j.ijheatmasstransfer.2017.01.058
• Languages: English
• ISSNs: 0017-9310

Abstract

Highlights: Mass transfer from single bubbles contaminated with alcohols in pipes is measured. The experimental condition covers various bubble shapes. The carbon chain length of the alcohols affects the mass transfer from bubbles. A way to account for the effects in mass transfer correlations is discussed. Abstract: Mass transfer rates, kL, of single carbon dioxide bubbles contaminated with alcohols in vertical pipes of 12.5, 18.2 and 25.0 mm diameters were measured to investigate effects of the carbon chain length of the alcohols on kL . Four straight-chain alcohols, i.e. 1-pentanol, 1-heptanol, 1-octanol and 1-decanol, were used. A wide range of bubble diameter, d, covered ellipsoidal and Taylor bubbles. Effects of the alcohol concentration, Csol, on kL were also investigated to make clear the values of Csol corresponding to fully-contaminated conditions. As a result, the following conclusions were obtained. (1) The kL of bubbles contaminated with alcohols decrease with increasing Csol, and they become constant at high Csol, i.e. bubbles in the latter Csol ranges are fully-contaminated from the point of view of mass transfer. On the other hand, the rising velocities decrease with increasing Csol due to the reduction of surface tension even when kL are independent of Csol . (2) The kL of ellipsoidal bubbles fully-contaminated with alcohols decrease with increasing the carbon chain length, whereas the reduction rate of kL becomes smaller and smaller as the carbon chain length increases. The kL of fully-contaminated ellipsoidal bubbles can be expressed by accounting for the adsorption constant of alcohol in an available kL correlation. (3) The increase in the carbon chain length also decreases kL of fully-contaminated Taylor bubbles, whereas the effect of carbon chain length on kL becomes smaller with increasing d .