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Fluid Flow And Heat Transfer Of Liquid Liquid Taylor Flow In Microchannels
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Book Synopsis Fluid Flow and Heat Transfer of Liquid-liquid Taylor Flow in Microchannels by : Ayoub Abdollahi
Download or read book Fluid Flow and Heat Transfer of Liquid-liquid Taylor Flow in Microchannels written by Ayoub Abdollahi and published by . This book was released on 2019 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt: Microfluidic devices are increasingly finding use in engineering applications due to their abilities in thermal management, and their enabling of better flow control. Applications include electronic cooling, microscale heat exchangers, and microreactors. While a number of numerical and experimental studies were found on single phase flow in microchannels, only a few studies have focused on the application of Taylor droplet flow within microchannels. Taylor droplet flow is characterised by periodically organised droplets in a carrier fluid, and has been shown to offer greatly enhanced rates of heat transfer over single phase flow. The practical realisation of the Taylor droplet system however requires generation of knowledge on its behaviour in square and rectangular microchannels. This thesis therefore focuses on understanding the fluid flow and heat transfer behaviour of Taylor droplet flow with no phase change in square microchannels using computational fluid dynamics (CFD) modelling, and experimental techniques. In this study, experiments were carried out in a stainless steel microchannel with a square cross section, having a hydraulic diameter of 2mm. To enable these studies, an experimental test rig was developed with three main sections: a T-junction section that allows Taylor fluid flow to be generated, a test section for heat transfer and pressure drop measurements, and a transparent visualization section. This test rig allowed heat transfer experiments to be performed while simultaneously visualising the Taylor droplet flow. The experiments were performed for single phase fluid flow and liquid-liquid Taylor droplet flow. In order to extend the understanding of the hydrodynamic and thermal behavior of single phase and Taylor flows in microchannels, a series of numerical simulations are performed that matched the experimental conditions. Three-dimensional numerical simulations were carried out using a volume of fluid (VOF) method with the commercial computational fluid dynamics (CFD) software package, ANSYS Fluent, Release 17.0. The effect of some critical dimensionless groups on the accuracy of the estimates of the heat transfer rate was studied. Discrepancies were found between experimental measurements of Nusselt number and theoretical predictions, particularly at low Reynolds numbers (Re
Book Synopsis Fluid Flow, Heat Transfer and Boiling in Micro-Channels by : L. P. Yarin
Download or read book Fluid Flow, Heat Transfer and Boiling in Micro-Channels written by L. P. Yarin and published by Springer Science & Business Media. This book was released on 2008-09-19 with total page 487 pages. Available in PDF, EPUB and Kindle. Book excerpt: The subject of the book is uid dynamics and heat transfer in micro-channels. This problem is important for understanding the complex phenomena associated with single- and two-phase ows in heated micro-channels. The challenge posed by high heat uxes in electronic chips makes thermal management a key factor in the development of these systems. Cooling of mic- electronic components by new cooling technologies, as well as improvement of the existing ones, is becoming a necessity as the power dissipation levels of integrated circuits increases and their sizes decrease. Miniature heat sinks with liquid ows in silicon wafers could signi cantly improve the performance and reliability of se- conductor devices. The improvements are made by increasing the effective thermal conductivity, by reducing the temperature gradient across the wafer, by reducing the maximum wafer temperature, and also by reducing the number and intensity of localized hot spots. A possible way to enhance heat transfer in systems with high power density is to change the phase in the micro-channels embedded in the device. This has motivated a number of theoretical and experimental investigations covering various aspects of heat transfer in micro-channel heat sinks with phase change. The ow and heat transfer in heated micro-channels are accompanied by a n- ber of thermohydrodynamic processes, such as liquid heating and vaporization, bo- ing, formation of two-phase mixtures with a very complicated inner structure, etc., which affect signi cantly the hydrodynamic and thermal characteristics of the co- ing systems.
Book Synopsis Laminar Flow Forced Convection in Ducts by : R. K. Shah
Download or read book Laminar Flow Forced Convection in Ducts written by R. K. Shah and published by Academic Press. This book was released on 2014-06-28 with total page 492 pages. Available in PDF, EPUB and Kindle. Book excerpt: Laminar Flow Forced Convection in Ducts is a sourcebook for compact heat exchanger analytical data. This book describes the analytical solutions for laminar fluid flow and forced convection heat transfer in circular and noncircular pipes, including applicable differential equations and boundary conditions involving velocity and temperature problems of fluid flow. The book also discusses fluid flow—how much power is required to pump fluids through the heat exchanger, as well as the heat transfer—the determination of q" distribution, and the temperature of fluid and walls. The text also analyzes the coolant or heat transfer fluid flows in a nuclear power reactor composed of a bundle of circular section fuel rods located inside a round tube. R.A. Axford addresses fluid flow and heat transfers results for the rod bundle geometry in "Heat Transfer in Rod Bundles." The book also provides an overview and guidelines that can be used for the designer and the applied mathematician. This book is suitable for engineers working in electronics, aerospace, instrumentation, and biomechanics that use cooling or heating exchanges or solar collection systems.
Book Synopsis Heat Transfer and Fluid Flow in Minichannels and Microchannels by : Satish Kandlikar
Download or read book Heat Transfer and Fluid Flow in Minichannels and Microchannels written by Satish Kandlikar and published by Elsevier. This book was released on 2006 with total page 492 pages. Available in PDF, EPUB and Kindle. Book excerpt: &Quot;This book explores flow through passages with hydraulic diameters from about 1 [mu]m to 3 mm, covering the range of minichannels and microchannels. Design equations along with solved examples and practice problems are also included to serve the needs of practicing engineers and students in a graduate course."--BOOK JACKET.
Book Synopsis Encyclopedia of Microfluidics and Nanofluidics by : Dongqing Li
Download or read book Encyclopedia of Microfluidics and Nanofluidics written by Dongqing Li and published by Springer Science & Business Media. This book was released on 2008-08-06 with total page 2242 pages. Available in PDF, EPUB and Kindle. Book excerpt: Covering all aspects of transport phenomena on the nano- and micro-scale, this encyclopedia features over 750 entries in three alphabetically-arranged volumes including the most up-to-date research, insights, and applied techniques across all areas. Coverage includes electrical double-layers, optofluidics, DNC lab-on-a-chip, nanosensors, and more.
Book Synopsis Heat Transfer And Fluid Flow In Microchannels by : Gian Piero Celata
Download or read book Heat Transfer And Fluid Flow In Microchannels written by Gian Piero Celata and published by Begell House Publishers. This book was released on 2004-08-01 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Experimental Measurements and Modeling of Liquid-liquid Taylor Flow in Mini-scale Tubing by : Wesam Adrugi
Download or read book Experimental Measurements and Modeling of Liquid-liquid Taylor Flow in Mini-scale Tubing written by Wesam Adrugi and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Immiscible two-phase segmented flow in a mini / micro scale channel is a promising area for heat transfer enhancement. A segmented flow, also known as a slug flow, plug flow or Taylor flow is a series of moving liquid segments separated by a liquid medium. A literature review of the research reveals large gaps in the knowledge base of liquid-liquid Taylor flows and calls for further investigation. Earlier studies have reported that introducing two immiscible liquids into mini / micro scale channels significantly increases heat transfer rate. The main focus of this research is on modeling liquid-liquid Taylor flows using an experimental approach based on the concept of the internal fluid flow and a dimensionless analysis for reducing experimental data. The purpose of this study is to investigate the fluid dynamic and thermal characteristics of liquid-liquid Taylor flows in small-scale tubes that will lead to better understanding on this process. Therefore, the heat transfer and pressure drop in two-phase liquid-liquid Taylor flows inside mini-scale tubing have been examined using a wide range of geometrical and operational parameters such as Capillary number, Prandtl number and minichannel geometries. Proposed models for each of these geometries have been developed to predict the heat transfer behaviors and pressure drop for low Reynolds number flow conditions. The effect of internal circulation and boundary layer renewal within the flow components is clearly presented. Namely, it is shown that cause significant thermal enhancement. The intensity of these circulations is a function of different parameters, including the flow conditions, channel geometry, and liquids employed. The effects of all of these parameters on heat transfer and pressure drop have been studied experimentally and are presented in this dissertation. Furthermore, this study demonstrates how heat transfer enhancement results due to varying the slug lengths of each phase in the liquid-liquid Taylor flow. New experimental data for liquid-liquid Taylor flows in straight, curved, and coiled mini scale tubes were obtained using low viscosity silicone oils segmented by water at varying volume fractions. The results of this thesis are of fundamental and practical relevance for the analysis and design of small systems and devices incorporating liquid-liquid Taylor flow regimes. The novel results were obtained with carefully controlled flow cell slug lengths and volume fractions, which show a significant impact on the rate of laminar heat transfer and pressure drop. Analytical models for each of these geometries have been developed. Dimensionless heat transfer rate and pressure drop results show good agreement with proposed analytical models. The proposed models' predictions for the heat transfer and pressure drop agree with the new experimental data within ± 20% or less.Liquid-Liquid Taylor Flow.
Book Synopsis Nanoparticle Heat Transfer and Fluid Flow by : W. J. Minkowycz
Download or read book Nanoparticle Heat Transfer and Fluid Flow written by W. J. Minkowycz and published by CRC Press. This book was released on 2016-04-19 with total page 335 pages. Available in PDF, EPUB and Kindle. Book excerpt: Featuring contributions by leading researchers in the field, Nanoparticle Heat Transfer and Fluid Flow explores heat transfer and fluid flow processes in nanomaterials and nanofluids, which are becoming increasingly important across the engineering disciplines. The book covers a wide range, from biomedical and energy conversion applications to mate
Book Synopsis Two-Phase Flow, Boiling, and Condensation by : S. Mostafa Ghiaasiaan
Download or read book Two-Phase Flow, Boiling, and Condensation written by S. Mostafa Ghiaasiaan and published by Cambridge University Press. This book was released on 2017-01-11 with total page 1322 pages. Available in PDF, EPUB and Kindle. Book excerpt: Providing a comprehensive introduction to the fundamentals and applications of flow and heat transfer in conventional and miniature systems, this fully enhanced and updated edition covers all the topics essential for graduate courses on two-phase flow, boiling, and condensation. Beginning with a concise review of single-phase flow fundamentals and interfacial phenomena, detailed and clear discussion is provided on a range of topics, including two-phase hydrodynamics and flow regimes, mathematical modeling of gas-liquid two-phase flows, pool and flow boiling, flow and boiling in mini and microchannels, external and internal-flow condensation with and without noncondensables, condensation in small flow passages, and two-phase choked flow. Numerous solved examples and end-of-chapter problems that include many common design problems likely to be encountered by students, make this an essential text for graduate students. With up-to-date detail on the most recent research trends and practical applications, it is also an ideal reference for professionals and researchers in mechanical, nuclear, and chemical engineering.
Book Synopsis Analytical Heat and Fluid Flow in Microchannels and Microsystems by : Renato M. Cotta
Download or read book Analytical Heat and Fluid Flow in Microchannels and Microsystems written by Renato M. Cotta and published by Springer. This book was released on 2015-10-10 with total page 175 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book focuses on the modeling and analysis of heat and fluid flow in microchannels and micro-systems, compiling a number of analytical and hybrid numerical-analytical solutions for models that account for the relevant micro-scale effects, with the corresponding experimental analysis validation when applicable. The volume stands as the only available compilation of easy to use analytically-based solutions for micro-scale heat and fluid flow problems, that systematically incorporates the most relevant micro-scale effects into the mathematical models, followed by their physical interpretation on the micro-system behavior.
Book Synopsis Flow boiling and condensation in microscale channels by : Fabio Toshio Kanizawa
Download or read book Flow boiling and condensation in microscale channels written by Fabio Toshio Kanizawa and published by Springer Nature. This book was released on 2021-04-30 with total page 290 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book covers aspects of multiphase flow and heat transfer during phase change processes, focusing on boiling and condensation in microscale channels. The authors present up-to-date predictive methods for flow pattern, void fraction, pressure drop, heat transfer coefficient and critical heat flux, pointing out the range of operational conditions that each method is valid. The first four chapters are dedicated on the motivation to study multiphase flow and heat transfer during phase change process, and the three last chapters are focused on the analysis of heat transfer process during boiling and condensation. During the description of the models and predictive methods, the trends are discussed and compared with experimental findings.
Book Synopsis VDI Heat Atlas by : VDI Gesellschaft
Download or read book VDI Heat Atlas written by VDI Gesellschaft and published by Springer Science & Business Media. This book was released on 2010-07-21 with total page 1608 pages. Available in PDF, EPUB and Kindle. Book excerpt: For more than 50 years, the Springer VDI Heat Atlas has been an indispensable working means for engineers dealing with questions of heat transfer. Featuring 50% more content, this new edition covers most fields of heat transfer in industrial and engineering applications. It presents the interrelationships between basic scientific methods, experimental techniques, model-based analysis and their transfer to technical applications.
Book Synopsis Heat Transfer and Fluid Flow in Microchannels by : Ghulam Mohiuddin Mala
Download or read book Heat Transfer and Fluid Flow in Microchannels written by Ghulam Mohiuddin Mala and published by . This book was released on 1999 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Heat Transfer and Fluid Flow in Microchannels by :
Download or read book Heat Transfer and Fluid Flow in Microchannels written by and published by . This book was released on 1999 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Heat Transfer and Pressure Drop in Flow Boiling in Microchannels by : Sujoy Kumar Saha
Download or read book Heat Transfer and Pressure Drop in Flow Boiling in Microchannels written by Sujoy Kumar Saha and published by Springer. This book was released on 2015-07-08 with total page 63 pages. Available in PDF, EPUB and Kindle. Book excerpt: This Brief addresses the phenomena of heat transfer and pressure drop in flow boiling in micro channels occurring in high heat flux electronic cooling. A companion edition in the Springer Brief Subseries on Thermal Engineering and Applied Science to “Critical Heat Flux in Flow Boiling in Micro channels,” by the same author team, this volume is idea for professionals, researchers and graduate students concerned with electronic cooling.
Book Synopsis Critical Heat Flux in Flow Boiling in Microchannels by : Sujoy Kumar Saha
Download or read book Critical Heat Flux in Flow Boiling in Microchannels written by Sujoy Kumar Saha and published by Springer. This book was released on 2015-06-04 with total page 62 pages. Available in PDF, EPUB and Kindle. Book excerpt: This Brief concerns the important problem of critical heat flux in flow boiling in microchannels. A companion edition in the SpringerBrief Subseries on Thermal Engineering and Applied Science to “Heat Transfer and Pressure Drop in Flow Boiling in Microchannels,” by the same author team, this volume is idea for professionals, researchers, and graduate students concerned with electronic cooling.
Book Synopsis Heat Transfer in Microchannels by : Sharon Shui Yee Leung
Download or read book Heat Transfer in Microchannels written by Sharon Shui Yee Leung and published by . This book was released on 2012 with total page 386 pages. Available in PDF, EPUB and Kindle. Book excerpt:
