Wyniki wyszukiwania - BazTech

1

Reactive solute transport in blood flow through a permeable capillary

Debnath S., Roy A. K., Bég O. A.

Archives of Mechanics

|

2022

|

Vol. 74, nr 2-3

173--200

EN

The present analysis discusses the solute transport process in a steady 2D (axial and radial) laminar flow of blood through a permeable, finite length capillary. Blood is treated as a homogeneous Newtonian fluid and the solute is absorbed at the capillary wall with a linear irreversible reaction rate. The velocity profile is obtained by a regular perturbation technique, whereas the transport coefficients depicted by the Gill generalized dispersion model are solved numerically. A number of different scenarios are considered, namely transport with no-reaction, weak absorption, strong absorption, low filtration or high filtration, etc. In the initial stages, the temporal behaviour of the dispersion coefficient is identical to those cases when there is no radial velocity. For the combined effect of radial and axial velocities, however, the dispersion coefficient is lower for a high absorption rate than for a weak absorption rate. Diffusion is accelerated with higher values of filtration coefficient. Owing to the opposite effects of radial diffusion and radial velocity, the solute particles require more time to reach the steady state. The analysis finds applications in, for example, reactive nutrient and pharmacological transport in capillary hemodynamics.

2

Numerical investigation of the turbulent flow generated with a radial Turbine using a converging hollow blade

Beloudane M., Bouzit M., Ameur H.

Polish Journal of Chemical Technology

|

2018

|

Vol. 20, nr 4

129--137

EN

The aim of this study is to investigate the effect of the blade shape on the characteristic of the flow patterns in a stirred tank. A new impeller blade design has been proposed. It is characterized by a converging hollow. The investigations of the flow structure generated in the vessel are made by using the computer code ANSYS CFX (version 16.0). The analysis has shown that the converging hollow blade yields highly radial flows which gave an increase in the radial velocity by 35% with less power consumption than the flat blade. Also, the effectiveness of the energy dissipation and the quality of mixing has been obviously noted. A validation test of our predicted results with other literature data was done, and a satisfactory agreement has been found.

3

Prediction of drop size distributions in stirred tanks equipped with radial and axial flow impellers

Podgórska W.

Chemical and Process Engineering

|

2009

|

Vol. 30, z. 1

181-197

EN

The influence of impeller type on the behaviour of droplets with partially mobile and immobile drop interfaces is considered. It is shown that in the case of pure breakage as well as during breakage and coalescence of droplets with immobile interfaces smaller drops are produced by pitched blade turbine than by Rushton turbine when the power input per unit mass is the same.

PL

Badano wpływ typu mieszadła na rozkład wielkości kropel w układzie ciecz.ciecz charakteryzującym się małą lepkością fazy rozproszonej. Pokazano, że zarówno w przypadku rozpadu kropel w dużej dyspersji, jak i jednoczesnego rozpadu i koalescencji kropel z nieruchomą powierzchnią mniejsze krople są wytwarzane w zbiorniku zaopatrzonym w mieszadło z pochylonymi łopatkami niż w turbinę Rushtona w przypadku zachowania jednakowej mocy włożonej na jednostkę masy.