Mitigation of fluid flow and thermal non-uniformity of nanofluids in microfluidic systems applied to processor chip: a comparative analysis of mass versus thermal mitigation

2021 ◽  
Author(s):  
Mangal Singh Lodhi ◽  
Tanuja Sheorey ◽  
Goutam Dutta
Keyword(s):  
Fluid Flow ◽  
Comparative Analysis ◽  
Microfluidic Systems ◽  
Thermal Mitigation

Effects of Hydrophilicity, Adhesion Work, and Fluid Flow on Biofilm Formation of PDMS in Microfluidic Systems

2020 ◽  
Vol 3 (12) ◽  
pp. 8386-8394
Author(s):  
Jinling Zhu ◽  
Minqi Wang ◽  
Hongbo Zhang ◽  
Shengbing Yang ◽  
Ki-Young Song ◽  
...  
Keyword(s):  
Fluid Flow ◽  
Biofilm Formation ◽  
Microfluidic Systems ◽  
Adhesion Work

scholarly journals Large scale patterning of hydrogel microarrays using capillary pinning

Lab on a Chip ◽  
2015 ◽  
Vol 15 (3) ◽  
pp. 664-667 ◽  
Author(s):  
Burcu Gumuscu ◽  
Johan G. Bomer ◽  
Albert van den Berg ◽  
Jan C. T. Eijkel
Keyword(s):  
Fluid Flow ◽  
Flow Control ◽  
Large Scale ◽  
Microfluidic Systems ◽  
Capillary Barriers ◽  
Fluid Flow Control

Capillary barriers provide a simple and elegant means of autonomous fluid-flow control in microfluidic systems.

scholarly journals Hydrodynamic studies on liquid-liquid two phase flow separation in microchannel by computational fluid dynamic modelling

2021 ◽  
Vol 4 (2) ◽  
pp. first
Author(s):  
Chue Cui Ting ◽  
Afiq Mohd Laziz ◽  
Khoa Dang Dang Bui ◽  
Ngoc Thi Nhu Nguyen ◽  
Pha Ngoc Bui ◽  
...  
Keyword(s):  
Fluid Flow ◽  
Fluid Model ◽  
Volume Of Fluid ◽  
Rapid Expansion ◽  
Separation Performance ◽  
Microfluidic Systems ◽  
Two Phase ◽  
Volume Of Fluid Model ◽  
Simulation Results ◽  
Methanol System

Microfluidic systems undergo rapid expansion of its application in different industries over the few decades as its surface tension-dominated property provides better mixing and improves mass transfer between two immiscible liquids. Synthesis of biodiesel via transesterification of vegetable oil and methanol in microfluidic systems by droplet flow requires separation of the products after the reaction occurred. The separation technique for multiphase fluid flow in the microfluidic system is different from the macro-system, as the gravitational force is overtaken by surface force. To understand these phenomena completely, a study on the hydrodynamic characteristics of two-phase oil-methanol system in microchannel was carried out. A multiphase Volume of Fluid model was developed to predict the fluid flow in the microchannel. An inline separator design was proposed along with its variable to obtain effective separation for the oil-methanol system. The separation performance was evaluated based on the amount of oil recovered and its purity. The capability of the developed model has been validated through a comparison of simulation results with published experiment. It was predicted that the purity of recovered oil was increased by more than 46% when the design with side openings arranged at both sides of the microchannel. The highest percentage recovery of oil from the mixture was simulated at 91.3% by adding the number of side openings to ensure the maximum recovery. The oil that was separated by the inline separator was predicted to be at 100% purity, which indicates that no methanol contamination throughout the separation process. The purity of the separated product can be increased by manipulating the pressure drop across the side openings. Hence, it can be concluded that the separation in a large diameter microchannel system is possible and methodology can be tuned to achieve the separation goal. Finally, the simulation results showed that the present volume of fluid model had a good agreement with the published experiment.

scholarly journals Hydrodynamics of a reactor with updated structure of frame mixing device

2021 ◽  
pp. 7-14
Author(s):  
V.O. Zazymko ◽  
M.F. Kalinina ◽  
V.Y. Shibetsky ◽  
O.M. Nedbailo
Keyword(s):  
Computer Simulation ◽  
Fluid Flow ◽  
Comparative Analysis ◽  
Fluid Flows ◽  
3D Models ◽  
Mixing Efficiency ◽  
Mixing Process ◽  
Element Analysis ◽  
Standard Design ◽  
Hydrodynamic Situation

This article is devoted to computer simulation of the hydrodynamic situation in a reactor with a standard design and an upgraded design of a frame stirrer. A comparative analysis of the hydrodynamics of fluid flows occurring in the volume due to the use of classical and modernized design was performed. An upgraded design of a frame stirrer for homogenizing the medium in a reactor has been proposed. The aim of this work was to study the influence of the geometry of the stirrer blades and their location in space on the speed and direction of flows in the reactor. The basis for the new design of the mixing device was the standard design of the frame mixer with two horizontal jumpers. Installation of additional blades and their placement at a certain angle to the vertical and horizontal planes and relative to each other was considered as one of the methods of improving the design. For this work, the study was conducted in the universal software system of finite element analysis ANSYS. Computer simulation is used to analyze complex systems and processes based on a computer model. The simulation was performed to analyze the influence of the geometry of the mixing device on the speed and direction of fluid flow in the apparatus. To conduct the study, 3D-models of two different types of geometry of the mixing device were built, physicomechanical parameters of the environment in the reactor were set and on the basis of these data the mixing process in the apparatus was modeled. In this work, the influence of plate geometry and their location in space on hydrodynamics is investigated. The basis of the proposed design of the mixing device is the task of intensifying the mixing process by increasing the mixing efficiency along the height of the apparatus. A comparative analysis of the direction of fluid flow, its velocity and temperature change using a standard and upgraded design of the mixing device was performed. It was found that when installing additional plates that are located at an angle to the horizontal and vertical planes in the reactor there are additional axial and radial fluid flows, which improves homogeneity and increases the intensity of mixing.

The Effect of Material Properties on the Efficiency of Valve-Less Rectification Micropumps

2010 ◽  
Author(s):  
Ahmed Fadl ◽  
Stefanie Demming ◽  
Zongqin Zhang ◽  
Bjo¨rn Hoxhold ◽  
Stephanus Bu¨ttgenbach ◽  
...  
Keyword(s):  
Reynolds Number ◽  
Fluid Flow ◽  
Material Properties ◽  
High Efficiency ◽  
Experimental Results ◽  
Apparent Effect ◽  
Microfluidic Systems ◽  
Flow Rates

High efficiency valve-less rectification micropumps are essential in developing effective microfluidic systems. Many parameters have been reported in the literature to have an effect on the efficiency of valve-less rectification micropumps. These parameters are related to the dynamics of fluid flow (such as Reynolds number), rectifying geometries, or actuators (such as actuator frequency). In this work, we studied the effect of the material properties on the efficiency of valve-less rectification micropumps. Two valve-less rectification micropumps based on the same rectifying geometry, bifurcation, are fabricated using two different materials, Polydimethylsiloxane (PDMS) and SU-8 photoresist. The pumps are tested and results are compared. Experimental results suggest that the material properties have an apparent effect on the pumping performance of valve less rectification micropumps. The results are presented in terms of flow rates and maximum back pressures.

scholarly journals Microfluidic systems for the analysis of viscoelastic fluid flow phenomena in porous media

2011 ◽  
Vol 12 (1-4) ◽  
pp. 485-498 ◽  
Author(s):  
F. J. Galindo-Rosales ◽  
L. Campo-Deaño ◽  
F. T. Pinho ◽  
E. van Bokhorst ◽  
P. J. Hamersma ◽  
...  
Keyword(s):  
Porous Media ◽  
Fluid Flow ◽  
Viscoelastic Fluid ◽  
Microfluidic Systems ◽  
Flow Phenomena

ESTIMATION OF THE EFFICIENCY OF APPLICATION OF LIGHT STEEL THIN-WALLED STRUCTURES IN TOWER STRUCTURES

2021 ◽  
pp. 26-48
Author(s):  
С. В. Ефрюшин ◽  
А. Р. Ефанов
Keyword(s):  
Fluid Flow ◽  
Comparative Analysis ◽  
Wind Pressure ◽  
Wind Flow ◽  
Aerodynamic Loads ◽  
Thin Walled Structures ◽  
Average Wind ◽  
Deformation Properties ◽  
Thin Walled ◽  
Ansys Workbench

Постановка задачи. Исследовать семь реально изготавливаемых на сегодняшний день профилей легких стальных тонкостенных конструкций (ЛСТК) на воздействие статических, а также аэродинамических нагрузок с целью нахождения наиболее эффективного для элементов башенного типа сооружений. Результаты. Осуществлен отбор реально изготавливаемых профилей ЛСТК. Проведен сравнительный анализ данных профилей по несущей способности и деформационным свойствам при помощи программного комплекса Ansys Workbench. Описана методика моделирования и определения среднего ветрового давления на профиль при помощи расчётно-вычислительного комплекса Ansys Fluid Flow (Fluent). Проведен сравнительный анализ профилей ЛСТК по среднему ветровому давлению и характеру обтекания профилей ветровым потоком. Сделан вывод о наиболее эффективных профилях ЛСТК для элементов башенного типа сооружений. Выводы. В ходе исследования была рассмотрена методика определения среднего ветрового давления при помощи расчётно-вычислительного комплекса Ansys Fluid Flow (Fluent). С учетом выборки профилей по несущей способности и деформационным свойствам (профили №1,2,4,6,7) и выборки профилей по среднему ветровому давлению и характеру обтекания профилей ветровым потоком (профили № 2-5) сделан вывод о том, что наиболее эффективными для элементов башенного типа сооружений и восприятия воздействия статических и аэродинамических нагрузок являются профили ЛСТК под номером 2 и 4 (рис. 2,4). Problem statement. To investigate seven actually manufactured profiles of light steel thin-walled structures (LSTS) for the effect of static and aerodynamic loads in order to find the most effective structures for tower-type elements. Results. The selection of actually manufactured LSTS profiles has been carried out. A comparative analysis of these profiles for bearing capacity and deformation properties was carried out using the Ansys Workbench software package. A technique for modeling and determining the average wind pressure on a profile using the Ansys Fluid Flow (Fluent) computational complex is described. A comparative analysis of the LSTS profiles by the average wind pressure and the nature of the wind flow around the airfoils is carried out. A conclusion is made about the most effective LSTS profiles for tower-type elements of structures. Conclusions. In this study, a method for determining the average wind pressure using the Ansys Fluid Flow (Fluent) computational complex was considered. Taking into account the sample of profiles for the bearing capacity and deformation properties (profiles No. 1,2,4,6,7) and the sample of profiles for the average wind pressure and the nature of the wind flow around the profiles (profiles No. 2-5), it was concluded that the most LSTS profiles numbered 2 and 4 (Fig. 2.4) are effective for tower-type elements of structures and for the perception of the effect of static and aerodynamic loads.

Sign in / Sign up

Export Citation Format

Share Document