scholarly journals Study of Liquid Film Forming Apparatus (LFFA) Mechanisms in Terms of Oxygen Transfer and Bubble Hydrodynamic Parameters

2016 ◽  
Vol 20 (3) ◽  
pp. 77-90 ◽  
Author(s):  
Marupatch Jamnongwong ◽  
Tawan Charoenpittaya ◽  
Narapong Hongprasith ◽  
Tsuyoshi Imai ◽  
Pisut Painmanakul
Keyword(s):  
Liquid Film ◽  
Oxygen Transfer ◽  
Hydrodynamic Parameters ◽  
Film Forming

Improvement of oxygen transfer efficiency in aerated ponds using liquid-film-assisted approach

2007 ◽  
Vol 55 (11) ◽  
pp. 183-191 ◽  
Author(s):  
H. Zhu ◽  
T. Imai ◽  
K. Tani ◽  
M. Ukita ◽  
M. Sekine ◽  
...  
Keyword(s):  
Mass Transfer ◽  
Liquid Film ◽  
Transfer Coefficient ◽  
Mass Transfer Coefficient ◽  
Oxygen Transfer ◽  
Structural Parameters ◽  
Volumetric Mass Transfer Coefficient ◽  
Aeration System ◽  
Film Forming ◽  
Oxygen Transfer Efficiency

In aerated ponds, oxygen is generally supplied through either diffused or mechanical aeration means. Surface transfer and bubble transfer both contribute significantly to oxygen transfer in a diffused aeration system. In the present study, a liquid-film-forming apparatus (LFFA) is successfully developed on a laboratory scale to improve considerably the surface transfer via the unique liquid film transfer technique. The experimental results show that the volumetric mass transfer coefficient for LFFA alone is found to be as much as 5.3 times higher than that for water surface and that the total volumetric mass transfer coefficient for the liquid film aeration system increases by 37% in comparison with a conventional aeration system. Additionally, by tuning finely the structural parameters of the LFFA, it can also lead to high dissolved oxygen (DO) water with the DO percent saturation greater than 90%. More importantly, this result is accomplished by simply offering a single-pass aeration at a depth as shallow as 26 cm. As a result, the objective of economical energy consumption in aerated ponds can be realized by lowering the aeration depth without sacrificing the aeration efficiency. It is noteworthy that the data presented in this study are acquired either numerically or experimentally.

Enhancement of Oxygen Transfer Efficiency in Diffused Aeration Systems using Liquid-Film-Forming Apparatus

2007 ◽  
Vol 28 (5) ◽  
pp. 511-519 ◽  
Author(s):  
H. Zhu ◽  
T. Imai ◽  
K. Tani ◽  
M. Ukita ◽  
M. Sekine ◽  
...  
Keyword(s):  
Liquid Film ◽  
Oxygen Transfer ◽  
Transfer Efficiency ◽  
Film Forming ◽  
Oxygen Transfer Efficiency

scholarly journals Hydrodynamic Parameters of Strelitzia Gum

2018 ◽  
Vol 2 (4) ◽  
pp. 45 ◽  
Author(s):  
Martin Masuelli
Keyword(s):  
Hydrodynamic Radius ◽  
Industrial Applications ◽  
Viscosity Measurement ◽  
Scattering Data ◽  
Hydrodynamic Parameters ◽  
A Value ◽  
Film Forming ◽  
Flexible Behavior ◽  
Strelitzia Reginae ◽  
Dynamic Light Scattering Data

The flower of Strelitzia reginae generates abundant and viscous mucilage as exudate, which is purified in periods of heating–cooling, and finally precipitated with ethanol, obtaining strelitzia gum (StrG). By means of intrinsic viscosity measurement, the viscometric molecular weight (MWv) is determined, with a value of 200,000 g/mol, as well as a hydrodynamic radius of 20 ± 1 nm and a hydration value of 445 ± 34 g/g. The size of StrG was compared against dynamic light scattering data with a value of 16 ± 2 nm and a MWDLS of 230,000 g/mol. StrG is a biopolyelectrolyte with an “a” value of 0.85, which corresponds to a flexible behavior with a great effect of volume exclusion. This statement is based on the difficulty of gum dissolution, that should be performed at 80 °C. This macromolecule is very promising and can potentially be used in several industrial applications, such as in film forming, and as a gel, thickener, and coemulsifier.

Response surface method for modeling the removal of carbon dioxide from a simulated gas using water absorption enhanced with a liquid-film-forming device

2018 ◽  
Vol 65 ◽  
pp. 116-126 ◽  
Author(s):  
Diem-Mai Kim Nguyen ◽  
Tsuyoshi Imai ◽  
Thanh-Loc Thi Dang ◽  
Ariyo Kanno ◽  
Takaya Higuchi ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Liquid Film ◽  
Water Absorption ◽  
Response Surface ◽  
Response Surface Method ◽  
Surface Method ◽  
Film Forming

A liquid-film forming acrylate cream for the treatment of anal pruritus

2012 ◽  
Vol 21 (2) ◽  
pp. 98-102 ◽  
Author(s):  
Nordwig Tomi ◽  
Rudolf Weiser ◽  
Robert Strohal ◽  
Martina Mittlboeck
Keyword(s):  
Liquid Film ◽  
Film Forming ◽  
Anal Pruritus

Studies on Oxygen Transfer Models

1982 ◽  
Vol 14 (1-2) ◽  
pp. 321-329 ◽  
Author(s):  
T Matsuo ◽  
K Hirayama
Keyword(s):  
Liquid Film ◽  
Oxygen Transfer ◽  
Dissipation Rate ◽  
Energy Dissipation Rate ◽  
The Other ◽  
Mean Square ◽  
Root Mean Square Velocity ◽  
Mass Transfer Mechanism ◽  
Water Surfaces ◽  
Film Coefficient

The liquid film coefficient of the oxygen transfer at air-water surfaces is dependent on turbulence characteristics of the flow. There are two methods for evaluating the liquid film coefficient with relation to turbulence; One is based on the root mean square velocity fluctuation and the larger scale movement and the other is based on the energy dissipation rate and the smaller scale movement. Conclusions obtained from some experimental and dimensional analyses imply that, for the mass transfer mechanism at the air-water surfaces, larger scale turbulent motion is dominated over smaller scale eddies represented by Kolmogoroff's micro-scale.

Sign in / Sign up

Export Citation Format

Share Document