Download or read book Numerical Investigation of Fluid Flow and Heat Transfer Effects in Minichannels and Microchannels Under H2 Boundary Condition written by Viral Vinodray Dharaiya and published by . This book was released on 2011 with total page 184 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Deviations in heat transfer predictions by classical theory for single-phase laminar flow in microchannels have been mainly attributed to surface roughness, deviations in channel dimensions, errors in measurement, entrance and exit effects. Identifying correct thermal boundary conditions in a given application also plays an important role in accurate estimation of heat transfer coefficients. Different thermal boundary conditions generally applied in fluid domain are: T, H1, and H2. However, there are very few solutions available for the heat transfer under the H2 boundary condition which is the most applicable thermal boundary condition in many microchannel heat exchangers. The current work aimed at addressing two outstanding issues in this field: (i) predicting heat transfer rate in rectangular channels under H2 boundary conditions, and (ii) numerically studying the effects of structured roughness on pressure drop and heat transfer. A numerical model is developed to predict accurate fluid flow and heat transfer effects in microchannels under H2 boundary condition. Numerical data sets are generated for rectangular microchannels with different heated wall configurations. Although the results are seen as relevant in microscale applications, they are applicable to any sized channels. Based on the numerical results obtained for a wide range of aspect ratios, generalized correlations for fully developed laminar Nusselt number as a function of channel aspect ratio are presented for all the cases. This information can provide better understanding and insight into the transport processes in the microchannels. Surface roughness effects in conventional ducts are minimal whereas for the micro-sized channel, the roughness effects needs to be taken into account for laminar flow. Developing a better insight of the fundamental effects of surface roughness in parallel plate microchannels is therefore essential. Based on various roughness characterization schemes, the effect of structured roughness elements for incompressible laminar fluid flow is analyzed and the proposed numerical model is extended to accurately predict the pressure drop and heat transfer coefficient in presence of roughness using CFD software, FLUENT. The results are compared with the available experimental data for some of the rough surfaces."--Abstract.

Download or read book Heat Transfer and Fluid Flow in Minichannels and Microchannels written by Satish Kandlikar and published by Butterworth-Heinemann. This book was released on 2013-10-25 with total page 588 pages. Available in PDF, EPUB and Kindle. Book excerpt: Heat exchangers with minichannel and microchannel flow passages are becoming increasingly popular due to their ability to remove large heat fluxes under single-phase and two-phase applications. Heat Transfer and Fluid Flow in Minichannels and Microchannels methodically covers gas, liquid, and electrokinetic flows, as well as flow boiling and condensation, in minichannel and microchannel applications. Examining biomedical applications as well, the book is an ideal reference for anyone involved in the design processes of microchannel flow passages in a heat exchanger. - Each chapter is accompanied by a real-life case study - New edition of the first book that solely deals with heat and fluid flow in minichannels and microchannels - Presents findings that are directly useful to designers; researchers can use the information in developing new models or identifying research needs

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.

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.

Download or read book Numerical Investigation of Fluid Flow and Heat Transfer in Microchannel written by and published by . This book was released on with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

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.

Download or read book Experimental and Numerical Investigation of Fluid Flow and Heat Transfer in Microchannels written by Wynn Allen Phillips and published by . This book was released on 2008 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Recent Asian Research on Thermal and Fluid Sciences written by Abhilash Suryan and published by Springer Nature. This book was released on 2020-02-18 with total page 693 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents a collection of the best papers from the Seventh Asian Joint Workshop on Thermophysics and Fluid Science (AJWTF7 2018), which was held in Trivandrum, India, in November 2018. The papers highlight research outputs from India, China, Japan, Korea and Bangladesh, and many of them report on collaborative efforts by researchers from these countries. The topics covered include Aero-Acoustics, Aerodynamics, Aerospace Engineering, Bio-Fluidics, Combustion, Flow Measurement, Control and Instrumentation, Fluid Dynamics, Heat and Mass Transfer, Thermodynamics, Mixing and Chemically Reacting Flows, Multiphase Flows, Micro/Nano Flows, Noise/NOx/SOx Reduction, Propulsion, Transonic and Supersonic Flows, and Turbomachinery. The book is one of the first on the topic to gather contributions from some of the leading countries in Asia. Given its scope, it will benefit researchers and students working on research problems in the thermal and fluid sciences.

Download or read book Engineering Fluid Flows and Heat Transfer Analysis II written by Houssem Laidoudi and published by Trans Tech Publications Ltd. This book was released on 2021-05-18 with total page 212 pages. Available in PDF, EPUB and Kindle. Book excerpt: Special topic volume with invited peer reviewed papers only

Download or read book Numerical Investigation on Heat Transfer and Fluid Flow Behaviors of Viscous Fluids Through Minichannel Heat Exchanger written by Mohammed Ismail and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

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.

Download or read book Heat Transfer Enhancement Using Nanofluid Flow in Microchannels written by Davood Domairry Ganji and published by William Andrew. This book was released on 2016-06-11 with total page 378 pages. Available in PDF, EPUB and Kindle. Book excerpt: Heat Transfer Enhancement Using Nanofluid Flow in Microchannels: Simulation of Heat and Mass Transfer focuses on the numerical simulation of passive techniques, and also covers the applications of external forces on heat transfer enhancement of nanofluids in microchannels. Economic and environmental incentives have increased efforts to reduce energy consumption. Heat transfer enhancement, augmentation, or intensification are the terms that many scientists employ in their efforts in energy consumption reduction. These can be divided into (a) active techniques which require external forces such as magnetic force, and (b) passive techniques which do not require external forces, including geometry refinement and fluid additives. - Gives readers the knowledge they need to be able to simulate nanofluids in a wide range of microchannels and optimise their heat transfer characteristics - Contains real-life examples, mathematical procedures, numerical algorithms, and codes to allow readers to easily reproduce the methodologies covered, and to understand how they can be applied in practice - Presents novel applications for heat exchange systems, such as entropy generation minimization and figures of merit, allowing readers to optimize the techniques they use - Focuses on the numerical simulation of passive techniques, and also covers the applications of external forces on heat transfer enhancement of nanofluids in microchannels

Download or read book Fluid Mechanics and Heat Transfer for Gases air He H2 and N2 Flowing Single Phase in Closed Channels written by Rose Kraft and published by . This book was released on 1962 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Experimental and Numerical Investigations of Two Phase Flow with Non Isothermal Boundary Conditions under Microgravity Conditions written by Sebastian Schmitt and published by Cuvillier Verlag. This book was released on 2017-03-06 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt: Two-phase flow with a free surface, non-isothermal boundary conditions and heat and mass transfer over the free surface must be understood for a save operation of cryogenic upper stages with restart capability. This work is a foundational research carried out with numerical and experimental means. A mathematical and numerical model were developed that allow to describe such systems under varying gravity levels. The reorientation of cryogenic parahydrogen upon a sudden gravity step reduction was investigated experimentally using the drop tower at ZARM, University of Bremen. Influencing the motion and final shape of the free surface could be realized with a precisely defined wall temperature gradient. Heat and mass transfer over the free surface in a microgravity environment could be investigated numerically based on the experimental results of the SOURCE-II sounding rocket experiment. A transient simulation was carried out to study the coupled system between superheated container wall, subcooled liquid, free surface configuration and three-phase contact angle.

Download or read book Gas Flows in Microsystems written by Lucien Baldas and published by MDPI. This book was released on 2019-10-28 with total page 220 pages. Available in PDF, EPUB and Kindle. Book excerpt: The last two decades have witnessed a rapid development of microelectromechanical systems (MEMS) involving gas microflows in various technical fields. Gas microflows can, for example, be observed in microheat exchangers designed for chemical applications or for cooling of electronic components, in fluidic microactuators developed for active flow control purposes, in micronozzles used for the micropropulsion of nano and picosats, in microgas chromatographs, analyzers or separators, in vacuum generators and in Knudsen micropumps, as well as in some organs-on-a-chip, such as artificial lungs. These flows are rarefied due to the small MEMS dimensions, and the rarefaction can be increased by low-pressure conditions. The flows relate to the slip flow, transition or free molecular regimes and can involve monatomic or polyatomic gases and gas mixtures. Hydrodynamics and heat and mass transfer are strongly impacted by rarefaction effects, and temperature-driven microflows offer new opportunities for designing original MEMS for gas pumping or separation. Accordingly, this Special Issue seeks to showcase research papers, short communications, and review articles that focus on novel theoretical and numerical models or data, as well as on new experimental results and technics, for improving knowledge on heat and mass transfer in gas microflows. Papers dealing with the development of original gas MEMS are also welcome.

Download or read book Convective Flow and Heat Transfer from Wavy Surfaces written by Aroon Shenoy and published by CRC Press. This book was released on 2016-10-14 with total page 329 pages. Available in PDF, EPUB and Kindle. Book excerpt: Convective Flow and Heat Transfer from Wavy Surfaces: Viscous Fluids, Porous Media, and Nanofluids addresses the wavy irregular surfaces in heat transfer devices. Fluid flow and heat transfer studies from wavy surfaces have received attention, since they add complexity and require special mathematical techniques. This book considers the flow and heat transfer characteristics from wavy surfaces, providing an understanding of convective behavioral changes.

Download or read book An Experimental and Numerical Investigation of Fluid Flow and Heat Transfer Through a Curved Passage of High Aspect Ratio written by Jerome Ellepola and published by . This book was released on 1995 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: