Bubble formation pattern with weeping at a submerged orifice.

Abstract

The adsorption equation for homogeneoussurface, Eq. (1), can represent single-component isotherms of hydrocarbons and carbon dioxide on activated fiber carbon KF-1 500 fairly well, but systematic deviations were observed in regions of low surface coverage. The total amount of active sites W%may be an adsorbent property which is proportional to the specific surface area. The value of W*for KF-1500 is 33% greater than that of Nuxit-AL, an activated granular carbon. The obtained parameters n and K are almost the same for the two activated carbons. The isosteric heats of adsorption calculated from the experimental isotherms decrease with increasing surface coverage for the five adsorbates on KF-1500. The curves of the isosteric heat indicate that the surface is a little heterogeneous. These observations are compatible with systematic deviations between the calculated and the experimental adsorptions. Acknowledgment Literature Cited 1) Nitta, T., T. Shigetomi, M. Kurooka and T. Katayama: /.

Design of Sieve Plate Spargers for Bubble Columns: Role of Weeping

“…Miyahara et al [5] have studied weeping through single-hole spargers of varying diameters (3±13.2 mm) using different chamber volumes. The chamber volume was found to play a significant role in determining the extent of weeping.…”

“…The former finds applications in plate columns, and a lot of publications with regards to weeping and dumping is available [3]. Whereas, in the later case reports are scantly available [1,2,4,5]. The effect of plate geometry (d O , N, P/d O , t/d O ) and the clear liquid height on weeping has not been studied properly for the case of bubble columns.…”

Bubble volume in single bubbling regime with weeping at a submerged orifice.

“…2.2 Theoretical consideration As has been already described, 9) in the single bubbling regime the bubbles are almost all of the same size and weeping does not occur during bubble formation, whereas it does occur after the detachment of a bubble. Further, initially an almost spherical bubble is formed at an orifice, proceeds to grow a neck and then detaches.…”

“…9) All of the orifices used with diameters of 3-13.2 mm were made of brass plate of 1 mmthickness (pt/d0= 0.075-0.33).…”

The Influence of Liquid Head and Liquid Circulation on Weeping Rates at a Submerged Orifice

“…Miyahara et al [8], investigated bubble formation patterns with weeping over a range of orifice diameters from 3 mm to 13.2 mm. All experiments were carried out with a liquid depth of 20 cm in a 20 cm 20 cm square column, and no liquid head effects in terms of weeping rate were reported.…”