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Experimental Investigation Of Heat Transfer In Additively Manufactured Internal Cooling Configurations
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Book Synopsis Experimental Investigation of Heat Transfer in Additively Manufactured Internal Cooling Configurations by : Tobias Krille
Download or read book Experimental Investigation of Heat Transfer in Additively Manufactured Internal Cooling Configurations written by Tobias Krille and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Cooling Performance of Additively Manufactured Microchannels and Film Cooling Holes by : Curtis Stimpson
Download or read book Cooling Performance of Additively Manufactured Microchannels and Film Cooling Holes written by Curtis Stimpson and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Additive manufacturing (AM) enables fabrication of components that cannot be made with any other manufacturing method. Significant advances in metal-based AM systems have made this technology feasible for building production parts to be used use in commercial products. In particular, the gas turbine industry benefits from AM as a manufacturing technique especially for development of components subjected to high heat flux. It has been shown that the use of microchannels in high heat flux components can lead to more efficient cooling designs than those that presently exist. The current manufacturing methods have prevented the use of microchannels in such parts, but AM now makes them manufacturable. However, before such designs can become a reality, much research must be done to characterize impacts on flow and heat transfer of AM parts. The current study considers the effect on flow and heat transfer through turbine cooling features made with AM. Specifically, the performance of microchannels and film cooling holes made with laser powder bed fusion (L-PBF) is assessed.A number of test coupons containing microchannels were built from high temperature alloy powders on a commercially available L-PBF machine. Pressure drop and heat transfer experiments characterized the flow losses and convective heat transfer of air passing through the channels at various Reynolds numbers and Mach numbers. The roughness of the channels surfaces was characterized in terms of statistical roughness parameters; the morphology of the roughness was examined qualitatively. Magnitude and morphology of surface roughness found on AM parts is unlike any form of roughness seen in the literature. It was found that the high levels of roughness on AM surfaces result in markedly augmented pressure loss and heat transfer at all Reynolds numbers, and conventional flow and heat transfer correlations produce erroneous estimates. The physical roughness measurements made in this study were correlated to flow and heat transfer measurements to generate a predictive model for flow through AM microchannels. The flow compressibility was also found to play a significant role in flow loss through these channels.Overall effectiveness of film cooling combined with the internal microchannel flow was examined in a conjugate experimental setup. The validity of the experimental conditions was established by matching important dimensionless parameters of the experimental setup to common values found in turbine engines. These results showed that the roughness in the film cooling holes produced higher in-hole convection than those made with current manufacturing methods. The roughness in the holes also repressed the film performance. However, high relative roughness was shown to minimize the impact of coolant feed direction on the film effectiveness of the AM holes.
Book Synopsis Fundamentals of Combustion Processes by : Sara McAllister
Download or read book Fundamentals of Combustion Processes written by Sara McAllister and published by Springer Science & Business Media. This book was released on 2011-05-10 with total page 315 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fundamentals of Combustion Processes is designed as a textbook for an upper-division undergraduate and graduate level combustion course in mechanical engineering. The authors focus on the fundamental theory of combustion and provide a simplified discussion of basic combustion parameters and processes such as thermodynamics, chemical kinetics, ignition, diffusion and pre-mixed flames. The text includes exploration of applications, example exercises, suggested homework problems and videos of laboratory demonstrations
Book Synopsis Fundamentals of Heat Exchanger Design by : Ramesh K. Shah
Download or read book Fundamentals of Heat Exchanger Design written by Ramesh K. Shah and published by John Wiley & Sons. This book was released on 2003-08-11 with total page 978 pages. Available in PDF, EPUB and Kindle. Book excerpt: Comprehensive and unique source integrates the material usually distributed among a half a dozen sources. * Presents a unified approach to modeling of new designs and develops the skills for complex engineering analysis. * Provides industrial insight to the applications of the basic theory developed.
Book Synopsis An Experimental Investigation of Heat Transfer in Narrow, Rectangular Cooling Channels with Pin-fins by : Lesley Mae Wright
Download or read book An Experimental Investigation of Heat Transfer in Narrow, Rectangular Cooling Channels with Pin-fins written by Lesley Mae Wright and published by . This book was released on 2003 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Experimental Heat Transfer and Bulk Air Temperature Measurements for a Multipass Internal Cooling Model with Ribs and Bleed by : Douglas Thurman
Download or read book Experimental Heat Transfer and Bulk Air Temperature Measurements for a Multipass Internal Cooling Model with Ribs and Bleed written by Douglas Thurman and published by . This book was released on 2000 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt: An experimental study was made to obtain heat transfer and air temperature data for a simple 3-leg serpentine test section that simulates a turbine blade internal cooling passage with trip strips and bleed holes. The objectives were to investigate the interaction of ribs and various bleed conditions on internal cooling and to gain a better understanding of bulk air temperature in an internal passage. Steady state heat transfer measurements were obtained using a transient technique with thermochromic liquid crystals. Trip strips were attached to one wall of the test section and were located either between or near the bleed holes. The bleed holes, used for film cooling, were metered to simulate the effect of external pressure on the turbine blade. Heat transfer enhancement was found to be greater for ribs near bleed holes compared to ribs between holes, and both configurations were affected slightly by bleed rates upstream. Air temperature measurements were taken at discreet locations along one leg of the model. Average bulk air temperatures were found to remain fairly constant along one leg of the model.
Book Synopsis Oscillating Heat Pipes by : Hongbin Ma
Download or read book Oscillating Heat Pipes written by Hongbin Ma and published by Springer. This book was released on 2015-05-22 with total page 441 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents the fundamental fluid flow and heat transfer principles occurring in oscillating heat pipes and also provides updated developments and recent innovations in research and applications of heat pipes. Starting with fundamental presentation of heat pipes, the focus is on oscillating motions and its heat transfer enhancement in a two-phase heat transfer system. The book covers thermodynamic analysis, interfacial phenomenon, thin film evaporation, theoretical models of oscillating motion and heat transfer of single phase and two-phase flows, primary factors affecting oscillating motions and heat transfer, neutron imaging study of oscillating motions in an oscillating heat pipes, and nanofluid’s effect on the heat transfer performance in oscillating heat pipes. The importance of thermally-excited oscillating motion combined with phase change heat transfer to a wide variety of applications is emphasized. This book is an essential resource and learning tool for senior undergraduate, graduate students, practicing engineers, researchers, and scientists working in the area of heat pipes. This book also · Includes detailed descriptions on how an oscillating heat pipe is fabricated, tested, and utilized · Covers fundamentals of oscillating flow and heat transfer in an oscillating heat pipe · Provides general presentation of conventional heat pipes
Book Synopsis Experimental Investigation of Heat Transfer to Fluids at Super-critical Pressures by : Sabino G. Merra
Download or read book Experimental Investigation of Heat Transfer to Fluids at Super-critical Pressures written by Sabino G. Merra and published by . This book was released on 1958 with total page 87 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis ASME 68-HT-9 by : Jeffrey W. Hodgson
Download or read book ASME 68-HT-9 written by Jeffrey W. Hodgson and published by . This book was released on 1968 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Numerical and Experimental Investigation of Heat Transfer and Fluid Flow Characteristics of an Air-cooled Oblique-finned Heat Sink by :
Download or read book A Numerical and Experimental Investigation of Heat Transfer and Fluid Flow Characteristics of an Air-cooled Oblique-finned Heat Sink written by and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Experimental Heat Transfer and Bulk Air Temperature Measurements for a Multipass Internal Cooling Model with Ribs and Bleed by : Douglas R. Thurman
Download or read book Experimental Heat Transfer and Bulk Air Temperature Measurements for a Multipass Internal Cooling Model with Ribs and Bleed written by Douglas R. Thurman and published by . This book was released on 2000 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt: An experimental study was made to obtain heat transfer and air temperature data for a simple 3-leg serpentine test section that simulates a turbine blade internal cooling passage with trip strips and bleed holes. The objectives were to investigate the interaction of ribs and various bleed conditions on internal cooling and to gain a better understanding of bulk air temperature in an internal passage. Steady state heat transfer measurements were obtained using a transient technique with thermochromic liquid crystals. Trip strips were attached to one wall of the test section and were located either between or near the bleed holes. The bleed holes, used for film cooling, were metered to simulate the effect of external pressure on the turbine blade. Heat transfer enhancement was found to be greater for ribs near bleed holes compared to ribs between holes, and both configurations were affected slightly by bleed rates upstream. Air temperature measurements were taken at discreet locations along one leg of the model. Average bulk air temperatures were found to remain fairly constant along one leg of the model.
Book Synopsis Heat Pipe Science And Technology by : Amir Faghri
Download or read book Heat Pipe Science And Technology written by Amir Faghri and published by Global Digital Press. This book was released on 1995-03 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: Presents basic and advanced techniques in the analytical and numerical modeling of various heat pipe systems under a variety of operating conditions and limitations. It describes the variety of complex and coupled processes of heat and mass transfer in heat pipes. The book consists of fourteen chapters, two appendices, and over 400 illustrations, along with numerous references and a wide variety of technical data on heat pipes.
Book Synopsis NACA Wartime Reports. Series L. by : Upshur T. Joyner
Download or read book NACA Wartime Reports. Series L. written by Upshur T. Joyner and published by . This book was released on 1943 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: Experimental results of tests made at the Langley Memorial Aeronautical Laboratory are presented to show how heat-transfer coefficients can be presented to show how heat-transfer coefficients can be increased by a method utilizing the high rate of heat transfer know to exist on any heat-transfer surface in the region adjacent to the edge on which the cooling or heating fluid impinges.
Book Synopsis Heat Transfer in the Porous Structure of an Additively Manufactured Evaporator for a Two-Phase Mechanically Pumped Loop for Space Applications by : Luca Valdarno
Download or read book Heat Transfer in the Porous Structure of an Additively Manufactured Evaporator for a Two-Phase Mechanically Pumped Loop for Space Applications written by Luca Valdarno and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The two-phase heat transfer technology has been a major thermal control hot-point for cooling or heat rejection during the last decade. Two-phase pumped cooling systems are applied when it is required to maintain a very stable temperature for heat dissipation in a system. A novel additively manufactured evaporator for two-phase thermal control has been developed at NASA Jet Propulsion Laboratory. The Two-Phase Mechanically Pumped Loop (2PMPL) permits latent heat transfer to be implemented with much wider breath of control authority compared to capillary-based systems while alleviating the system sensitivity to pressure drops. The flexibility of the 2PMPL stays in the capability to reclaim waste heat dissipation and to reject heat from discrete locations (multiple evaporators and condensers) and to control loop temperature with minimal control power. Another key aspect of this technology is the ability to integrate multi-phase heat transfer provisions directly with structural elements thanks to the conjunct use of the Additive Manufacturing Technology. A collaboration between the NASA Jet Propulsion Laboratory, University of California Los Angeles and University of Michigan has been established to develop numerical models for the prediction of the thermal behavior and performance of the 2PMPL. The Boiling and Phase Change Heat Transfer Laboratory in the Department of Mechanical and Aerospace Engineering at University of California Los Angeles has focused on the understanding and capture of the micro-scale evaporation occurring in the porous structure of the evaporator. The main goal of the research has been to develop a modelling tool that can be used to design and optimize the evaporator. An all-encompassing numerical simulation can be carried out to predict the operational thermal behaviour of the evaporator taking into account the effect of the liquid-vapor interface at the wick-to-vapor border. The numerical model allows to study the effect of different parameters, such as boundary conditions (inlet temperature, input heat loads, etc.), geometrical parameters and wick (effective thermal conductivity, permeability, pore size, etc.) and fluid properties. An experimental setup has been built in order to characterize the heat transfer within an additively manufactured porous sample and in particular its evaporative heat load under certain heat inputs. The experimental campaign has served also as validation for the numerical results and for the characterization of the transient phenomena such as dry-out.
Book Synopsis An Experimental Investigation and Correlation of the Heat Reduction to Nonporous Surfaces Behind a Porous Leading Edge Through Which Coolant is Ejected by :
Download or read book An Experimental Investigation and Correlation of the Heat Reduction to Nonporous Surfaces Behind a Porous Leading Edge Through Which Coolant is Ejected written by and published by . This book was released on 1960 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Heat Transfer in Aerospace Applications by : Bengt Sundén
Download or read book Heat Transfer in Aerospace Applications written by Bengt Sundén and published by Academic Press. This book was released on 2016-10-19 with total page 274 pages. Available in PDF, EPUB and Kindle. Book excerpt: Heat Transfer in Aerospace Applications is the first book to provide an overall description of various heat transfer issues of relevance for aerospace applications. The book contains chapters relating to convection cooling, heat pipes, ablation, heat transfer at high velocity, low pressure and microgravity, aircraft heat exchangers, fuel cells, and cryogenic cooling systems. Chapters specific to low density heat transfer (4) and microgravity heat transfer (9) are newer subjects which have not been previously covered. The book takes a basic engineering approach by including correlations and examples that an engineer needs during the initial phases of vehicle design or to quickly analyze and solve a specific problem. Designed for mechanical, chemical, and aerospace engineers in research institutes, companies, and consulting firms, this book is an invaluable resource for the latest on aerospace heat transfer engineering and research. - Provides an overall description of heat transfer issues of relevance for aerospace applications - Discusses why thermal problems arise and introduces the various heat transfer modes - Helps solve the problem of selecting and calculating the cooling system, the heat exchanger, and heat protection - Features a collection of problems in which the methods presented in the book can be used to solve these problems
Book Synopsis Heat Exchanger Design Handbook, Second Edition by : Kuppan Thulukkanam
Download or read book Heat Exchanger Design Handbook, Second Edition written by Kuppan Thulukkanam and published by CRC Press. This book was released on 2013-05-20 with total page 1275 pages. Available in PDF, EPUB and Kindle. Book excerpt: Completely revised and updated to reflect current advances in heat exchanger technology, Heat Exchanger Design Handbook, Second Edition includes enhanced figures and thermal effectiveness charts, tables, new chapter, and additional topics––all while keeping the qualities that made the first edition a centerpiece of information for practicing engineers, research, engineers, academicians, designers, and manufacturers involved in heat exchange between two or more fluids. See What’s New in the Second Edition: Updated information on pressure vessel codes, manufacturer’s association standards A new chapter on heat exchanger installation, operation, and maintenance practices Classification chapter now includes coverage of scrapped surface-, graphite-, coil wound-, microscale-, and printed circuit heat exchangers Thorough revision of fabrication of shell and tube heat exchangers, heat transfer augmentation methods, fouling control concepts and inclusion of recent advances in PHEs New topics like EMbaffle®, Helixchanger®, and Twistedtube® heat exchanger, feedwater heater, steam surface condenser, rotary regenerators for HVAC applications, CAB brazing and cupro-braze radiators Without proper heat exchanger design, efficiency of cooling/heating system of plants and machineries, industrial processes and energy system can be compromised, and energy wasted. This thoroughly revised handbook offers comprehensive coverage of single-phase heat exchangers—selection, thermal design, mechanical design, corrosion and fouling, FIV, material selection and their fabrication issues, fabrication of heat exchangers, operation, and maintenance of heat exchangers —all in one volume.
