Haruo Hikita

Bio: Haruo Hikita is an academic researcher. The author has contributed to research in topics: Packed bed & Wetted area. The author has an hindex of 2, co-authored 2 publications receiving 5 citations.

Effect of Rippling on Liquid Phase Mass Transfer in Wetted-Wall Columns

Abstract: In wetted wall columns, pure carbon dioxide was absorbed in water containing surface active agent.With the increase in the concentration of the agent, rippling on the surface of the liquid film decreased. When the concentration of the agent exceeded a certain value, rippling almost disappeared. The effect of this change in rippling on the rate of mass transfer from gas to liquid across the interface was studied, and the results obtained are shown in Fig. 2 and 3, in which HL is plotted versus Re on logarithmic coordinates.From these results, it appears that with the decrease in rippling, the disturbance caused by the mixing action of ripples decreases and the flow pattern of the liquid film in the pseudo-stream line flow approaches that of the liquid film in the true viscous flow.The results obtained by the present author and the previous investigators3, 6) for the case when there was no rippling, are shown in Figs. 5 and 6, respectively, as the plots of HL/z versus l/p on logarithmic coordinates. The best line through the data can be expressed by Eq. (8). This experimental line lies above the theoretical line based on the unsteady-state diffusion theory derived by Pigford9. The discrepancy between the theory and the experiment is probably due to the difference between the assumed and actual flow conditions for the liquid film.

The Flow of Liquids in Thin Films

Abstract: Publisher Summary This chapter studies fluid–flow characteristics of liquids in layers, with and without a superimposed gas velocity. The types of turbulence in layers need to be investigated and also the nature of a laminar layer containing ripples. As regards the theoretical studies of film flow, it is shown in the chapter that it is possible to predict quite accurately the flow behavior in the smooth laminar flow regime of the film; unfortunately, this flow regime is not of great practical importance. The Kapitsa theory for wavy film flow appears to apply over only a very limited part of the total wavy flow regime. Several new experimental techniques for the study of film flow have been developed. Film flow is a special case of two-phase flow. It takes place along a solid surface of some sort, with only one free surface. The second phase in contact with the free surface of the film may be either a gas or a second liquid, which may be at rest or in motion relative to the solid surface on which the film flows. Film flow is distinguished from other forms of two-phase flow by the presence of large interfaces of basically simple geometrical configuration. Two-phase flows are also often further classified as single-component. The occurrence and applications of film flow in modern technology are numerous and important.

Absorption methods for the determination of mass transfer parameters of packing internals: A literature review

Abstract: Methods for the determination of mass‐transfer coefficients and effective interfacial areas in packed absorption columns are reviewed. For each parameter, the methods are grouped into categories on the basis of their physical principle; the chemical systems used, experimental protocol, and the advantages and inconveniences are discussed. The treatment of end effects, the influence of packed bed height, and the recent efforts in standardization of measurement methods are also treated. The aim of the review is to give a broad overview of the methods used in literature in the last eight decades, some of which might be reconsidered in the light of modern measurement techniques and to evaluate them in relation to precision, practicality and hazardousness thereby to facilitate the search for reliable, precise, and convenient experimental practices.