Download or read book Heat Transfer and Pressure Drop for Water Flow in Helically Coiled Tubes in the Laminar and Transition Regions written by Harry Edward Dombrowski and published by . This book was released on 1967 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Heat Transfer and Pressure Drop of Developing Flow in Smooth Tubes in the Transitional Flow Regime written by Marilize Everts and published by . This book was released on 2014 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt: Heat exchangers have a wide range of applications and engineers need accurate correlations to optimise the design of these heat exchangers. During the design process, the best compromise between high heat transfer coefficients and relatively low pressure drops is usually in the transitional flow regime. Limited research has been done on tube flow in the transitional flow regime. These studies considered either fully developed flow, or average measurements of developing flow across a tube length. No research has been done with the focus on developing flow in smooth tubes in the transitional flow regime. Therefore, the purpose of this study was to experimentally investigate the heat transfer and pressure drop characteristics of developing flow in the transitional flow regime. An experimental set-up was designed, built and validated against literature. Heat transfer and pressure drop measurements were taken at Reynolds numbers between 500 and 10 000 at three different heat fluxes (6.5, 8.0 and 9.5 kW/m2). A total of 398 mass flow rate measurements, 19 158 temperature measurements and 370 pressure drop measurements were taken. Water was used as the test fluid and the Prandtl number ranged between 3 and 7. The test section was a smooth circular tube and had an inner diameter and length of 11.52 mm and 2.03 m, respectively. An uncertainty analysis showed that the uncertainties of the Nusselt numbers and Colburn j-factors varied between 4% and 5% while the friction factor uncertainties varied between 1% and 17%. Five different flow regimes (laminar, developing laminar, transitional, low-Reynolds-number-end and turbulent) were identified in the first part of the tube during the experiments and nomenclature was developed to more clearly identify the boundaries of the different flow regimes. The developing laminar regime was unique to developing flow and decreased along the tube length. Both the start and end of transition were delayed along the tube length and the width of the transition region decreased slightly. This is in contrast with the results obtained in literature where the effect of the non-dimensional distance from the inlet on fully developed flow in the transition region was investigated. Transition was also slightly delayed with increasing heat flux, but secondary flow effects had no significant influence on the width of the transition region. The relationship between heat transfer and pressure drop was investigated and correlations were developed to predict the Nusselt number as a function of friction factor, Reynolds number and Prandtl number in the laminar, transitional, low-Reynolds-number-end and turbulent flow regimes. Overall, it can be concluded that the heat transfer characteristics of developing and fully developed flow differ significantly and more work needs to be done to fully understand the fundamentals before the heat transfer and pressure drop characteristics are fully understood.
Download or read book Single and Two Phase Flow Pressure Drop and Heat Transfer in Tubes written by Afshin J. Ghajar and published by Springer Nature. This book was released on 2022-01-11 with total page 280 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book provides design engineers an elemental understanding of the variables that influence pressure drop and heat transfer in plain and micro-fin tubes to thermal systems using liquid single-phase flow in different industrial applications. It also provides design engineers using gas-liquid, two-phase flow in different industrial applications the necessary fundamentals of the two-phase flow variables. The author and his colleagues were the first to determine experimentally the very important relationship between inlet geometry and transition. On the basis of their results, they developed practical and easy to use correlations for the isothermal and non-isothermal friction factor (pressure drop) and heat transfer coefficient (Nusselt number) in the transition region as well as the laminar and turbulent flow regions for different inlet configurations and fin geometry. This work presented herein provides the thermal systems design engineer the necessary design tools. The author further presents a succinct review of the flow patterns, void fraction, pressure drop and non-boiling heat transfer phenomenon and recommends some of the well scrutinized modeling techniques.
Download or read book Design and Operation of Heat Exchangers and their Networks written by Wilfried Roetzel and published by Academic Press. This book was released on 2019-10-04 with total page 598 pages. Available in PDF, EPUB and Kindle. Book excerpt: Design and Operation of heat Exchangers and Their Networks presents a comprehensive and detailed analysis on the thermal design methods for the most common types of heat exchangers, with a focus on their networks, simulation procedures for their operations, and measurement of their thermal performances. The book addresses the fundamental theories and principles of heat transfer performance of heat exchangers and their applications and then applies them to the use of modern computing technology. Topics discussed include cell methods for condensers and evaporators, dispersion models for heat exchangers, experimental methods for the evaluation of heat exchanger performance, and thermal calculation algorithms for multi-stream heat exchangers and heat exchanger networks. - Includes MATLAB codes to illustrate how the technologies and methods discussed can be easily applied and developed - Analyses a range of different models, applications, and case studies in order to reveal more advanced solutions for industrial applications - Maintains a strong focus on the fundamental theories and principles of the heat transfer performance of heat exchangers and their applications for complex flow arrangement
Download or read book Investigation of Heat Transfer and Pressure Drop Characteristics in Helically Coiled Tubes written by Benjamin Z. Hayes and published by . This book was released on 2001 with total page 498 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Heat Transfer and Pressure Drop for Air Flowing in Small Tubes written by William Henry McAdams and published by . This book was released on 1950 with total page 300 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Proceedings of the International Conference of Fluid Power and Mechatronic Control Engineering ICFPMCE 2022 written by Liang Yan and published by Springer Nature. This book was released on 2023-02-10 with total page 415 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is an open access book. Since 1985, held 22 times in different cities all over China, ICFPMCE has now been listed in annual academic activities (non-profit) of the Chinese Society of Theoretical and Applied Mechanics (CSTAM), which has become one of the significant conferences in the field of fluid power and mechatronic control engineering. Under the theme of ‘Green Intelligence, Innovative Development’, ICFPMCE 2022 aims to provide a platform for the participants who have been working in the fields of Fluid mechanics, hydraulic and electrical engineering. In addition to keynote speeches and technical sessions to be hosted by famous experts over the world, the conference will organize a number of mini-symposia with themes of sharing the experiences of applying for the National Natural Science Foundation of China, dialogues between editors-in-chief of the journals and young scholars, experts and entrepreneurs, as well as innovative technology exhibition etc., in order to highlight the significant subjects and trends in the field.
Download or read book An Experimental Investigation of Pressure Drop and Heat Transfer for Water Boiling in a Vertical upflow Single tube Heat Exchanger written by James R. Stone and published by . This book was released on 1967 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Food Processing Operations Modeling written by Soojin Jun and published by CRC Press. This book was released on 2008-11-27 with total page 370 pages. Available in PDF, EPUB and Kindle. Book excerpt: The food industry is on the verge of making some serious advances in the food processing sector. If successful, tomorrow's consumers will have unhindered access to safe, nutritious, and high-quality products via novel food processing technologies. Food Processing Operations Modeling: Design and Analysis, Second Edition demonstrates how to effective
Download or read book Heat Transfer to Fluids in Coiled Tubing in the Streamline Flow Region written by Ralph Roger Berg and published by . This book was released on 1950 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Thermal Characteristics and Convection in Nanofluids written by Aditya Kumar and published by Springer Nature. This book was released on 2021-01-04 with total page 230 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book covers synthesis, characterization, stability, heat transfer and applications of nanofluids. It includes different types of nanofluids, their preparation methods as well as its effects on the stability and thermophysical properties of nanofluids. It provides a discussion on the mechanism behind the change in the thermal properties of nanofluids and heat transfer behaviour. It presents the latest information and discussion on the preparation and advanced characterization of nanofluids. It also consists of stability analysis of nanofluids and discussion on why it is essential for the industrial application. The book provides a discussion on thermal boundary layer properties in convection. Future directions for heat transfer applications to make the production and application of nanofluids at industrial level are also discussed.
Download or read book Single phase Heat Transfer and Pressure Drop of Water Cooled at a Constant Wall Temperature Inside Horizontal Circular Smooth and Enhanced Tubes with Different Inlet Configuration in the Transitional Flow Regime written by Jonathan Albert Olivier and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: It is common practice to design water chiller units and heat exchangers in such a way that they do not operate within the transition region. This is mainly due to the perceived chaotic behaviour as well as the paucity of information in this region. Due to design constraints or change of operating conditions, however, exchangers are often forced to operate in this region. This is even worse for enhanced tubes as much less information within this region is available. It is also well known that the entrance has an influence on where transition occurs, adding to the woes of available information. The purpose of this study is thus to obtain heat transfer and friction factor data in the transition region of fully developed and developing flows inside smooth and enhanced tubes, using water as the working fluid, and to develop correlations from these results. The use of different inlets, tube diameters and enhanced tubes was also investigated with regards to the commencement of transition. Heat transfer and pressure drop data were obtained from six different types of tubes with diameters of 15.88 mm (5/8??) and 19.02 mm (3/4??). Low fin enhanced tubes with a fin height to diameter ratio of 0.4 and helix angles of 18 and 27 were investigated. Heat transfer was obtained by means of an in-tube heat exchanger with the cooling of water being used as the test fluid. Reynolds numbers ranged between 1 000 and 20 000 while Prandtl numbers were in the order of 4 to 6. Uncertainties in heat transfer coefficient and friction factors were on average below 2.5% and 10% respectively. Adiabatic friction factor results showed that the use of different inlets influenced the commencement of transition. The smoother the inlet profile the more transition was delayed, confirming previous work done. The effect of increasing tube diameters had a slight delay in transition. Enhanced tubes caused transition to occur at lower Reynolds numbers which was accounted for by the fin height and not the helix angle. Heat transfer results showed that transition occurred at approximately the same Reynolds number for all the different inlets and enhanced tubes. This was attributed to the secondary flow forces influencing the growing hydrodynamic boundary layer. These secondary flow forces also influenced the laminar heat transfer and diabatic friction factors with both these parameters being higher. Turbulent enhanced tube heat transfer results were higher than those of the smooth tube, with the tube with the greatest helix angle showing the greatest increase. Correlations were developed for all the tubes and their inlets and predicted all the data on average to within 3%.
Download or read book Heat Transfer and Pressure Drop of Water Flowing in a Small Tube written by Howard L. McGill and published by . This book was released on 1950 with total page 258 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Heat and Mass Transfer written by Alekseĭ Vasilʹevich Lykov and published by . This book was released on 1967 with total page 1242 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Applied Mechanics Reviews written by and published by . This book was released on 1948 with total page 770 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Previews of Heat and Mass Transfer written by and published by . This book was released on 1986 with total page 632 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Smart Technologies for Energy Environment and Sustainable Development written by Mohan Lal Kolhe and published by Springer. This book was released on 2019-07-02 with total page 801 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book comprises select proceedings of the International Conference on Smart Technologies for Energy, Environment, and Sustainable Development (ICSTEESD 2018). The chapters are broadly divided into three focus areas, viz. energy, environment, and sustainable development, and discusses the relevance and applications of smart technologies in these fields. A wide variety of topics such as renewable energy, energy conservation and management, energy policy and planning, environmental management, marine environment, green building, smart cities, smart transportation are covered in this book. Researchers and professionals from varied engineering backgrounds contribute chapters with an aim to provide economically viable solutions to sustainable development challenges. The book will prove useful for academics, professionals, and policy makers interested in sustainable development.
