Numerical study on flow and heat and mass transfer in. In this experiment the performance of pulsating heat pipe using ethanol and distilled water is experimented. Experimental research was conducted to understand heat transfer characteristic of pulsating heat pipe in this paper, and the php is made of high quality glass capillary tube. Heat pipes, electronic cooling, wick structure, working fluids, computer. Mvk160 heat and mass transfer may 7, 2012, lund, sweden heat pipe, selection of working. A novel double pipe pulsating heat pipe design to tackle. The original heat pipe operating principle was developed by richard s. Schematic of a pulsating heat pipe and its design variations 2. Schematic of a typical pulsating heat pipe with design variations. Afterwards mostly qualitative and some quantitative. The effects of heating position on heat transfer were. Experimental investigations on the thermal performance of a. Pdf closed loop pulsating heat pipe rasel a sultan academia. What is a heat pipe heat pipes basics and technology.
Computational model of miniature pulsating heat pipes. Thermal performance of closed loop pulsating heat pipe using. The pulsating heat pipe has a single closed loop made of copper. A loop heat pipe with coherent pores integrated to the heat source is considered as a calculation model in this paperfig. Heat pipe can be differentiate on the basis of wick structure as wick heat pipe and wickless heat pipes,in wickless category there are thermosyphon and pulsating heat pipes. Its the two phase heat transfer device suitable for low power applications such as electronic cooling. Originally developed and patented by hisateru akachi in 1990, ohps consist of a long meandering tube which is heated and cooled at various points along its length. Passive twophase cryogen thermal links for cryocooling. Review of pulsating heat pipe working fluid selection. Heat pipe manufacturers generally provide data sheets. In this literature focus is on pulsating heat pipes phps. To summarize, if you are a student just learning about heat pipes, or are on a limited budget, then this is a great book to get started. These tubes are evacuated and partially filled with the working fluid. Pulsating heat pipe php, or oscillating heat pipe ohp, a novel type of highly efficient heat transfer component, has been widely applied in many fields, such as in spaceborne twophase thermal control systems, in the cooling of electronic devices and in energysaving technology, etc.
Pdf toward a design of a micro pulsating heat pipe. The design of a heat pipe is rather complex with many things to consider. Beginning with a definition of the problem, including the temperature. Pulsating heat pipe pulsating or oscillating heat pipe, invented in early 1990s present promising alternatives for the removal of high localized heat fluxes to provide a necessary level of temperature uniformity across the components that need to be cooled. The application of heat pipes should be considered when the thermal design is either conduction limited or when nonthermal goals such as weight cannot be achieved with other materials such as solid aluminum andor copper. A novel cryogenic heat pipe, oscillating heat pipe ohp, which consists of an 4. In this chapter, a cpu thermal design power tdp, cooling methods of.
Kr101553547b1 a flat plate pulsating heat pipe applicable. Experimental analysis, design and applications 7 selection of working. Heat transfer analysis of shell and tube heat exchanger using. For cooling of electronic or electric equipment, there is a growing industrial demand of highperformance thermal links. Experimental analysis, design and applications 3 closedloop php closedloop php with check valve closedend ph openend php figure 2. There are several limits that govern heat pipe theory, however in terrestrial applications the capillary limit is the most limiting factor. This is to certify that the thesis entitled, numerical analysis of performance of closed loop pulsating heat pipe submitted by mr. One of the outstanding features of php is its long distance transporting ability. In the present paper, the characteristics and working principles of the phps are introduced and the. Computational model of miniature pulsating heat pipes m. Pulsating hpp are potentially cheaper than conventional wicked heat pipe panels. On the design fundamentals of pulsating heat pipes. Dec 02, 2019 numerical simulation was performed to establishing a twodimensional pulsating heat pipe model, to investigate the flow and heat transfer characteristics in the pulsating heat pipe by using the mixture and euler models, which were unsteady models of vaporliquid twophase, based on the controlvolume numerical procedure utilizing the semiimplicit method.
A closedloop pulsating heat pipe php, also called oscillating heat pipe, ohp usually consists of a sealed, meandering channel connected endtoend. Indian institute of technology kanpur, kanpur up 208016 india. Where can i find detailed design guide for pulsating heat pipe. Peter kew first became involved in heat pipes in the late 1970s as a research officer with international research and development working on a range of heat transfer and energy conservation projects, including heat pipe development which was then led by david reay. Loop heat pipe with coherent porous wick since the porous material used for current heat pipes is usually stochastic structure, it is hard to apply analytical or numerical methods for design optimization.
Jul 22, 2019 this paper describes the experimental investigations conducted on a closed loop pulsating heat pipe clphp for assessing the thermal performance. The pulsating heat pipes php, also called oscillating heat pipes, belong to the thermal system category of heat pipes, twophase passive thermal devices used to transfer heat from a hot source to a cold region, with very high equivalent thermal conductivity, higher than any usual metallic material, light, and able to manage high heat fluxes. View pulsating heat pipe research papers on academia. Heat pipes are referred to as the superconductors of heatdue to their fast transfer capability with low heat loss. Efficient heat transferefficient heat transfer boiling and condensationboiling and condensation small temperature difference between the heat source and. Oscillating pulsating heat pipe ohp is one of the promising cooling devices in modern. The total heat load a heat pipe can carry is a function of total length, evaporator and condenser length, diameter, and orientation with respect to gravity. Computational model of miniature pulsating heat pipes sandia. Ats engineering ebook advanced thermal solutions, inc. A good description of the history of the heat pipe technology can be found in an early article published by yale eastman currently a director of act in scientific american in may 1968. Briefly here both cchp and vchp are touched upon again. Numerical analysis of performance of closed loop pulsating. Here a discussion of various factors affecting the performance is held and a detailed study is conducted by through a cfd simulation using vof model. This paper presents an experimental study on the operational limitation of closed loop pulsating heat pipes clphps, which consist of a total of 40 copper tubes with 1 mm and 2 mm inner diameter, respectively.
The issue of compatibility and the results of life tests on heat pipes and thermosyphons remain critical aspects of heat pipe design and manufacture. The pulsating heat pipe affords a highly effective heat transfer component that has been extensively researched at room temperature, but is. When the heat source is much smaller than the heat sink base, a flat. An introduction to pulsating heat pipes electronics cooling. Figure 7 shows a flat pipe design, they can be used as heat spreaders. As with any design process, many of the decisions that must be taken are interrelated and the process is iterative. This report presents a numerical model of a pulsating heat pipe, a device employing a two. They are attractive heat transfer elements, which due to their simple design, cost effectiveness, and. Heat pipes are remarkably versatile devices, capable of being manufactured at the very small scale such as for cooling electronic devices and on a much larger scale such as for. The heat pipe temperature reaches the water temperature in about 25 seconds, while the copper rod reaches just 30c after 200 seconds.
Design considerations when using heat pipes electronics cooling. Project description by means of knowledge about the theory of heat pipes, one is now able to carry out a basic calculation of a heat pipe. A novel design of pulsating heat pipe with fewer turns applicable to all orientations. Cryogenic design and colling methods for rotating sc. Introduction to piping engineering by gerald may, p. Groll c a college of environmental science and engineering, donghua university, shanghai 200051, pr china b mechanical engineering department, indian institute of technology kanpur, kanpur 208016, india c institute of nuclear technology and energy systems, university of stuttgart, 70550 stuttgart, germany. Condenser temperature, sensor is embedded between hp and condenser section of heat pipe. This paper describes the experimental investigations conducted on a closed loop pulsating heat pipe clphp for assessing the thermal performance. Adiabatic temperature of heat pipe, measurement on heat pipe top side. The bends are placed at the evaporator and condenser areas of the heat pipe. Pulsating heat pipes php pulsating heat pipes php are twophase heat transfer devices, manufactured from a spiralshaped capillary pipe or an extruded section with a large number of channels.
Thermal couples were attached to the surface of the test panel approximately. A pulsating heat pipe php 1 is a passive and extremely efficient way of exchanging heat between a hot source and a cold one. I am trying to design a pulsating heat pipe with a capacity of 4050w for cooling of electronics components in cpu. Feb 05, 2018 its the two phase heat transfer device suitable for low power applications such as electronic cooling. Each of these processes has proven feasibility and used together can readily produce mephps. Conclusions pulsating heat pipe panels hpp were tested to be sure they are useful for the electronic components cooling and sorption machines thermal control. There are different types of phps, as represented in fig. The perkins tube design closest to the present heat pipe was patented by jacob perkins 1836. Experimental analysis of close loop pulsating heat pipe at different filling ratio 1ankursinh p. Experimental analysis of close loop pulsating heat pipe at. Thermomhydrodynamics of closed loop pulsating heat pipes iitk. This report presents a numerical model of a pulsating heat pipe, a device employing a two phase. A computer program for designing and predicting the performance of the heat pipe systems was developed.
He further patent on php which is long meandering tube heated and cooled at two separate ends, the. Unlike conventional heat pipes, the pulsating heat pipes php are made from a long continuous capillary tube bent into many turns, and filled more working fluid than conventional heat pipes. Originally developed and patented by hisateru akachi in 1990, ohps consist of a long meandering tube which is heated and cooled at. This book introduces operational and design principles for heat pipes. Performance analysis of pulsating heat pipes using various.
Numerical simulation was performed to establishing a twodimensional pulsating heat pipe model, to investigate the flow and heat transfer characteristics in the pulsating heat pipe by using the mixture and euler models, which were unsteady models of vaporliquid twophase, based on the controlvolume numerical procedure utilizing the semiimplicit method. An assembled microchannel pulsating heat pipe the testing of the mephp panels was performed by applying resistive heaters to one end of the me php test panel while fixing the other end to a heat sink. They differ by their geometry and a mechanism of fluid transport inside the heat pipe. Written by a former senior chief scientist at lockheed who has also worked for westinghouse and the u. Pdf cfd simulation of a pulsating heat pipe using ansys.
A heat pipe is a heattransfer device that combines the principles of both thermal conductivity and phase transition to effectively transfer heat between two solid interfaces. A heat pipe heat exchanger is a simple device which ismade use of to transfer heat from one location to another,using an evaporationcondensation cycle. Under different fill ratio, heat transfer rate and many other influence factors, the flow patterns were observed in the startup, transition and stable stage. Experimental research on heat transfer of pulsating heat pipe. Also, in contrast to existing models that mostly consider tubular designs, we. Investigation on thermal design of a rack with the pulsating heat pipe for cooling cpus applied thermal engineering, vol. May 01, 2003 an introduction to pulsating heat pipes may 1, 2003 sameer khandekar heat pipes design, liquid cooling, number 2, php, pulsating heat pipe, volume 9 modern electronics thermal management faces considerable challenges in the wake of component miniaturization, which has led to higher demands on net heat flux dissipation.
A typical configuration for a conventional heat pipe chp is. For example, choice of the wick and case material eliminates many candidate working fluids often including water due to. An introduction to pulsating heat pipes may 1, 2003 sameer khandekar heat pipes design, liquid cooling, number 2, php, pulsating heat pipe, volume 9 modern electronics thermal management faces considerable challenges in the wake of component miniaturization, which has led to higher demands on net heat flux dissipation. This chapter discusses the main components of the heat pipe and the materials used. Author links open overlay panel kuohsiang chien a yurtsai. Introduction heat pipe is a capillary twophase heat transfer device. Traditional pulsating heat pipe with fewer turns is functional only when the heat source is placed at the bottom while the heat sink is on top. Pdf pulsating heat pipes php have created a newer arena and promising possibilities as passive devices for heat transfer applications. This article is intended to offer design guidance when using heat pipes for the most prevalent types of electronics applications. Thermomhydrodynamics of closed loop pulsating heat pipes. The pulsating heat pipes php, also called oscillating heat pipes, belong to the thermal system category of heat pipes, twophase passive thermal devices used. Operational limit of closed loop pulsating heat pipes. Jun 18, 20 a heat pipe heat exchanger is a simple device which ismade use of to transfer heat from one location to another,using an evaporationcondensation cycle. Evaporator temperature of heat pipe, measurement on heat pipe top side.
A novel design of pulsating heat pipe with fewer turns. This study proposes a novel design having alternative doublepipe tube diameter with some extra open connections of these doublepipes. Our proprietary diffusion bonding technology is then applied to assemble the mephps. However, in an actual application when a heat pipe is soldered or epoxied to the base of a heat sink, the effective thermal conductivity of the heat pipe may be. Practical designs of pulsating heat pipes adapted from 14. Overall, heat pipes theory, design and applications is an excellent book that covers the subject in great depth for the benefit of heat pipe designers and users. Even the name is heat pipe,but working is very much different than the conventional heat pipes. This study presents a novel pulsating heat pipe php concept that is functional even when php is with fewer turns and is operated horizontally. Pdf design of a hydrogen pulsating heat pipe researchgate. Culham microelectronics heat transfer laboratory department of mechanical engineering university of waterloo waterloo, ontario, canada, n2l 3g1 phone. Heat pipe operating principles pressure drops operating temperature functional types of heat pipes heat pipe operating characteristics heat pipe design and selection design considerations mostly for vendors selecting heat pipes as part of thermal control system and.
Heat pipe design and technology modern applications for. Design considerations when using heat pipes electronics. When the diameter of the tube is so small, preferably book, both constant condenser heat pipe cchp and variable condenser heat pipe vchp types are discussed along with their general applications, and later, a mathematical modeling of heat pipe was presented, following chaps. Pulsating heat pipe is a kind of highly efficient heat conductor in which the latent heat of evaporation is used to transport great amounts of heat in the presence of only small differences in temperature. And it is found that the working fluid significantly affects the start up characteristics of a pulsating heat. Experimental investigations on the thermal performance of. Peregrine embeds pulsating heat pipes within the plane of flat sheetsplates by using printed circuit board technology to micromachine the channels. Case study pulsating heat pipes by the peregrine falcon.
Volume 55, issues 2122, october 2012, pages 57225728. The pulsating heat pipe assisted tool holder was designed and fabricated. Pulsating heat pipes are made from a long capillary tube which is bent multiple times, or from a rectangular plate with capillary channels manufactured in it. I have been involved in heat pipe design, fabrication, and testing for almost 30 years. 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. There may exist an optional adiabatic zone in between evaporator and condenser. Jun 11, 2015 this webinar will provide you with an understanding of heat pipe operation and performance, design guidelines to integrate heat pipes into your system, and provide the necessary tools to run easy. Pulsating heat pipes, apparently simple and very promising cooling devices, are very intriguing for theoretical and experimental investigations alike.
Inline with these developments is the introduction of pulsating heat pipes in the early nineties 47. Pulsating hpp are convenient with the low pressure working fluids like water, alcohol and some hydrocarbons. The closed loop pulsating heat pipe of inner diameter 2mm is filled with one of the fluid with a filling ratio of 50% and the variation of temperature is observed for every 2 minutes interval of time at 100 watts, 120 watts 1nd 140 watts. Experimental analysis of closed loop pulsating heat pipe with variable filling ratio dharmapal a baitule 1 and pramod r pachghare corresponding author. This book provides a practical study of modern heat pipe engineering, discussing how it can be optimized for use on a wider scale.
A heat pipe is a heat transfer device that combines the principles of both thermal conductivity and phase transition to effectively transfer heat between two solid interfaces. Heat pipes, 6th 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. The present invention relates to a flat plate pulsating heat pipe flat plate php, which can be applied at various angles and provide a heat transfer system of high efficiency without using electricity in a compact size electronic device such as a mobile phone or a note book computer. Pulsating heat pipe is new addition in wickless heat pipe family with promising heat transfer capacity introduced by akachi in 90s. It consists of a closed capillary tube folded into meander and partially filled with a liquid. We explore and scrutinize two possible configurations of pulsating heat pipe php based heat exchangers for process waste heat exchange as well as high heat flux. Operational limit of closed loop pulsating heat pipes honghai yang a, s. Pulsating heat pipe pulsating heat pipe has many numbers of uturns of tube with capillary diameter. We order this book in bulk to give to our engineers and research technicians i just bought 20 more copies. In parallel, heat pipes in various configurations and designs, have played a. Transports heat from a heat source to a heat sink works as an isothermalizer why twophase thermal system.
Oscillating heat pipes ohp, also referred to as pulsating heat pipes php, are a relatively new development in the field of heat pipe technology. One such thermal device is the recently invented pulsating called also oscillating heat pipe php. Oscillating heat pipes ohps have high heat spreading performance and are capable of removing higher heat fluxes. Ashutosh kr singh in partial fulfillment of the requirements for the award of master of technology degree in mechanical engineering with specialization in thermal engineering at the.
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