Theoretical and Experimental Investigation of an Axially Loaded Heat Pipe PDF Download
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Author: Brian Grayson Hager
Publisher:
ISBN:
Category : Heat pipes
Languages : en
Pages : 222
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Book Description
Author: Brian Grayson Hager
Publisher:
ISBN:
Category : Heat pipes
Languages : en
Pages : 222
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Book Description
Author: Brian V. Borgmeyer
Publisher:
ISBN:
Category : Electronic apparatus and appliances
Languages : en
Pages : 174
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Book Description
As the conventional heat sinks meet their heat transport limit, the pulsating heat pipe as one of advanced phase-change heat transfer devices will present the next generation of electronics cooling. An experimental and theoretical study was conducted regarding the motion of the liquid and vapor slugs within a pulsating heat pipe. A pulsating heat pipe with non-circular channels was investigated to determine the effect of operating parameters such as working fluid, tilted angle, filled liquid ratio, and heat flux level. The mathematical model theoretically solved for the position and velocity of the liquid and vapor slugs using the modified governing equations for a mechanical forced damped system. For comparison, experimental investigations quantified the position and velocity of the liquid-vapor interface through the use of a high speed camera. The mathematical and experimental investigations explored the effect of the various parameters on fluid motion. Experimental data obtained from the high speed camera did not show good relation to the mathematical model developed, however, the effects of each parameter seen in the model related to experimental observations.
Author: David Reay
Publisher: Butterworth-Heinemann
ISBN: 0080982794
Category : Technology & Engineering
Languages : en
Pages : 280
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Book Description
Heat Pipes, Sixth Edition, takes a highly practical approach to the design and selection of heat pipes, making it an essential guide for practicing engineers and an ideal text for postgraduate students.This new edition has been revised to include new information on the underlying theory of heat pipes and heat transfer, and features fully updated applications, new data sections, and updated chapters on design and electronics cooling. The book is a useful reference for those with experience and an accessible introduction for those approaching the topic for the first time. Contains all information required to design and manufacture a heat pipe Suitable for use as a professional reference and graduate text Revised with greater coverage of key electronic cooling applications
Author: Yaxiong Wang
Publisher:
ISBN:
Category :
Languages : en
Pages : 536
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Book Description
Author: P. J. Marto
Publisher:
ISBN:
Category : Heat
Languages : en
Pages : 68
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Book Description
An approximate theoretical model is derived for laminar film condensation on the inside of a rotating, truncated cone, and is used to predict the heat transfer performance of rotating, non-capillary heat pipes for a wide variety of parametric conditions. Experimental results are presented for water, ethyl alcohol, and freon-113 in a stainless steel heat pipe rotating to speeds of 2800 rpm. Results show that these devices can be used effectively to transfer large quantities of heat in rotating systems. Predicted results agree to within + or - 20 percent of the experimental data. Dropwise condensation, instead of film condensation, improves heat pipe performance while the presence of non-condensible gases impairs performance.
Author: Amir Faghri
Publisher: Global Digital Press
ISBN: 1560323833
Category : Science
Languages : en
Pages : 32
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Book Description
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.
Author: Shibin Liang
Publisher:
ISBN:
Category : Electronic dissertations
Languages : en
Pages :
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Book Description
A mathematical model describing the oscillation characteristics of slug flow in a capillary tube is presented. The model considers the vapor bubble as the gas spring for the oscillating motions in a capillary tube including effects of capillary force, gas spring constant, dimensions, gravitational force, and initial pressure distribution of the working fluid. Numerical results indicate that the isentropic bulk modulus generates stronger oscillations than the isothermal bulk modulus. While it demonstrates that the capillary tube diameter, bubble size, and unit cell numbers determine the oscillation, the capillary force, gravitational force, and initial pressure distribution of the working fluid significantly affect the frequency and amplitude of oscillating motion in the capillary tube. An experimental study of a five-turn closed loop oscillating heat pipe has been conducted. The oscillating heat pipes charged with HPLC grade water, acetone and ethanol have been tested respectively. In a vertical orientation, the oscillating motion of the slug flow in the oscillating heat pipe has been observed.
Author: Tyler Baxter Duncan
Publisher:
ISBN:
Category : Microcomputers
Languages : en
Pages : 150
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Book Description
The current investigation is to develop a high heat flux heat pipe that is intended to dissipate a minimum of 80 W/cm 2 . In order to accomplish this task, a "tower" heat pipe will be developed. In this heat pipe, a vertical tube with an enhanced internal surface of capillary grooves will be used to promote condensation and direct fluid flow. The flat end surfaces will have a wick structure of sintered particles to ensure even wetting of the evaporative region and provide optimal conditions for thin film evaporation. A mathematical model will be developed to predict the heat transfer performance of this "tower" heat pipe. The investigation will result in a better understanding of heat transport capability occurring in a highly efficient heat pipe.
Author: P. J. Marto
Publisher:
ISBN:
Category : Heat
Languages : en
Pages : 68
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Book Description
Author: National Aeronautics and Space Adm Nasa
Publisher: Independently Published
ISBN: 9781792707414
Category :
Languages : en
Pages : 34
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Book Description
An experimental investigation of capillary-pumped loop (CPL) head pipes with single and multiple evaporators designed to develop and validate a computer model to predict the performance of CPL heat pipes over a wide range of conditions is discussed. The results of a literature search and review and a numerical study to determine the effects of geometric design parameters on the CPL heat pipe pressure drop and heat transfer characteristics are described. Vapor groove geometry and the use of circular versus rectangular evaporators were studied. Obot, N. T. NASA-CR-196408, NAS 1.26:196408 NAG5-2471...
